SQ100-48-1.5 - Broadband TelCom Power, Inc.

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A.

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Description

The SQ family of high power density, high efficiency

DC/DC converters deliver up to 25A in an industry

standard quarter brick footprint. They are targeted

specifically at the telecommunication, industrial

electronics, mobile telecommunication and distributed

power markets. With a wide input voltage range of 36-

75V they are available with output voltages of either

1.5, 1.8, 2.5, 3.3 or 5 Volts. All models feature an

input filter, input undervoltage lockout, output

overvoltage and overtemperature protection, output

current limiting and short circuit protection. These

converters are available either in a package that is

fully enclosed with a six-sided metal shield or an

alternative, open-frame construction. In both cases the

aluminum heat spreader design achieves very efficient

heat transfer with no hot spots. The use of patented

Flat Transformer technology and other patented

design concepts facilitate very low temperature rise.

The use of highly derated power devices help to

achieve high reliability, high performance and offer a

low cost solution to systems designers requiring

maximum power in small footprints.

Applications

• Telecommunications

• Data Communications

• Wireless Communications

• Networking Gear

• Servers, Switches and Data Storage

• Semiconductor Test Equipment

• Distributed Power Architecture

Features

• Delivers up to 25A in a quarter brick

• High power density up to 90W/inch3

• High efficiency Synchronous topology

• Unique Flat Transformer Technology

• No airflow or heat sink required

• No minImum load required

• Low profile of only 0.34 inch

• 1.5V, 1.8V, 2.5V, 3.3V or 5V output models

• Wide input operating range 36-75V

• -40°C to +100°C ambient operation

• Input undervoltage lockout

• Output overvoltage protection

• Output current limit and short circuit protection

• Remote On/Off pin (Negative logic

also available)

• Output adjustment +/-10% range

• Output remote sense feature

• 1500V, 10M input-to-output isolation

• Enclosed construction with heat spreader for

low temperature rise

• Also available in an open-frame construction

• UL 60950 recognized, TUV EN60950 and

CSA C22.2 No. 60950-00 Certified and CE

marked

• Meets conducted limits of FCC Class B and

CEI IEC61204-3 Class B with external filter

• MTBF of 750,000 hours @ 50°C

(MIL-HDBK-217F)

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 2 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

CONVERTER SELECTION

Typical @ Ta=+25°C under nominal line voltage and full load conditions.

Input Output

Voltage (Volts) Current (A) Voltage Current

Efficiency

75% Load

Model Nominal Range No load Full load (Volts) (Amps) (%)

SQ100-48-1.5 48 36-75 0.040 0.9 1.5 25 87

For negative logic feature add designator N as suffix to model number, i.e., SQ100-48-1.5N

Consult factory for other output voltage configurations.

Outline Information and Summary Specifications

Pin Connection

Pin# Function

1 Vin +

2 On/Off

3 Vin -

4 Vout -

5 Sense -

6 Trim

7 Sense +

8 Vout +

All dimensions are in inches [mm]

Pin 4 and 8 are dia. 0.062 [1.57]

All other pins are all dia. 0.040 [1.02]

Pin material: Brass

Pin finish: Tin/Lead plated

Heat spreader (baseplate) material: Aluminum

Weight: 50.7g (1.8oz)

Tolerance

Inches Millimeters

•XX ± 0.020 •X ± 0.5

•XXX ± 0.010 •XX ± 0.25

Pin: ± 0.002 ± 0.05

Thermal derating for vertical orientation, Vin=54V

Output Current at 40°C (Amps) Output Current at 60°C (Amps)

200 LFM 300 LFM 200 LFM 300 LFM

Output

Voltage

(Volts) NoHeatsink With

Heatsink No Heatsink With

Heatsink

1.5 25 25 24 25 23 25 25 25

The information and specifications contained in this specification are believed to be accurate and reliable at the time

of publication. Specifications are subject to change without notice.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 3 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Electrical Specification

Typical test data at Ta=25°C, Vin=48V unless otherwise noted.

PARAMETER NOTES MIN TYP MAX UNIT

Absolute maximum rating

Input voltage 0 80 V

Operating case temperature -40 100 °C

Storage temperature -55 125 °C

Humidity 95 %

Input characteristics

Operating input voltage range 36 48 75 V

Turn on voltage threshold 34 35 36 V

Turn off voltage threshold 33 34 35 V

Transient withstand Transient duration: 100ms 100 V

Maximum input current 100% load, 36Vin 1.3 1.7 A

Off converter input current 36Vin 2.2 3.5 mA

Output characteristics

Output voltage set point 1.490 1.500 1.510 V

Output voltage line regulation 36~75 Vin ±1 ±1.1 %

Output voltage load regulation 10%-100%Load ±1 ±1.1 %

Output voltage trim range Percentage of normal output -20 +15 %

Output voltage ripple and noise 20Mz bandwidth, 100% Load, 48Vin 100 150 mV(pk-pk)

Output over power protection 110 120 140 %

Over-voltage protection 1.8 2.0 2.2 V

Output current range 0 25 A

Over-temperature protection 110 120 °C

Temperature coefficient ±0.05 %/°C

Capacitive Load 0 20,000 µF

Output dynamic characteristics

Startup time 5% to 95% of the output voltage 50 80 ms

Transient recovery time 25% load change 800 µs

Transient Peak Deviation 25% load change 10 %Vo

Efficiency (see efficiency curve)

100% load efficiency 48 Vin 85 %

Isolation characteristics

Isolation voltage (primary to secondary) 1minute 1500 VDC

Isolation voltage (primary to case) 1minute 1000 VDC

Isolation voltage (secondary to case) 1minute 1000 VDC

Isolation resistance 500VDC, Primary to secondary 10 MΩ

Isolation capacitance Primary to secondary 1000 pF

Feature Characteristics

Switching frequency 340 360 380 KHz

ON/OFF control (Positive logic)

Converter On

Converter Off SQ100-48-1.5 2.5

-1.0 7

1.2 V

V

ON/OFF control (Negative logic)

Converter On

Converter Off SQ100-48-1.5N -1.0

2.5 1.2

7 V

V

Calculated MTBF Bellcore @50°C 1,000,000 Hrs

Weight 40 g

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 4 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Basic operation and functions

The SQ family uses FTT technology to achieve

high output current. The whole unit switches at

the fixed frequency for a predictable EMI

performance. Rectification of the transformer's

output is done by synchronous rectifiers to make

the unit work in a higher efficiency power

performance.

The SQ Brick has many standard controls and

protection functions.

Input ( pin1, pin3 )

Input power Vin(+) must be connected to Positive

input voltage pin1; Input power Vin(-) must be

connected to Negative input voltage pin3.

Output ( pin8, pin4 )

Output power Vout(+) must be connected to

Positive output voltage pin8; Output power Vout(-

) must be connected to Negative output voltage

pin4.

On/Off ( pin 2 )

Permits the user to maintain unit On/Off, in order

to properly sequence different power supplies

and reduce power consumption during the

standby condition. There are two remote control

options available, positive logic and negative logic

is referenced to Vin (-), and typical connections

are shown in Fig 1.

Fig. 1: Typical Circuit for On/Off Function

Pin 2 is the "Enable" pin, connecting a TTL

compatible pin. A TTL control signal to this pin,

according to the specification, will turn the unit on

or off.

The positive logic version turns on when pin 2 is

at logic high, and turns off when pin 2 is at logic

low. The unit is on when pin 2 is left open.

The negative logic version turns on when pin 2 is

at logic low and turns off when pin 2 is at logic

high. The pin 2 can be directed to Vin(-), to

enable automatic turn on to the unit without the

need of an external control signal.

Turn on timing vs. Input On/Off Pin is shown in

Figure 12, and the Turn off timing vs. Input On/Off

pin is shown in Figure 13.

Remote Sense ( pin 5, pin 7 )

Permits the user to maintain the accurate output

voltage at the remote load terminals regardless of

the line drop.

The Sense(-) (pin5) and Sense (+) (pin7) should

be connected at the load or at the point where the

regulation is needed. ( shown on Fig. 2)

Fig 2: Remote Sense Circuit

The remote sense feature of the unit

compensates for voltage drop occurring between

the output pins of the unit and load. The Sense(-)

(pin5) and Sense(+)(pin7) should be connected at

the load or at the point where regulation is

required.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 5 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

If remote Sense is not required, the Sense(-) pin

must be connected to the Vout(-) pin (pin4), and

the Sense(+) pin must be connected to the

Vout(+) pin(pin 8) to ensure the unit will regulate

at the specified output voltage. If these

connections are not made, the unit’s output

voltage will be higher than the specified value.

The unit output over voltage protection senses

the voltage across Vout(+) and Vout(-), and not

across the sense lines, so the resistance between

the output pins of the unit and the load should be

minimized to prevent unwanted triggering of the

OVP.

When using the remote sense feature, the output

voltage at the unit can be increased by as much

as 10% above the normal rating, in order to

maintain the required voltage across the load.

Therefore, the designer must consider this

condition.

Also when using the remote sense function, the

output power must be taken care of, as not to

exceed the maximum power capability of the unit.

Output voltage trim (pin 6)

Permits the user to adjust the output voltage up

or down to achieve the custom voltage or to make

the output voltage margining. The adjustment

range is from + 10% to -20%.

Output voltage can be adjusted up or down, by

connecting the Rtrim-up or Rtrim-down resistor as

shown. Rtrim-up makes the output voltage go up

to 10%; and the Rtrim-down makes the output

voltage go down to 20%. (see Fig.5 & Fig. 6)

Leave Trim pin ( Pin 6) open for normal output

voltage.

When trimming up, care must be taken, not to

exceed the unit OVP threshold. A typical circuit is

shown in Fig. 3.

Also, care must be taken not to exceed the unit’s

maximum allowable output power.

Fig 3. Trim Up Output Voltage Circuit

For Trim up resistor value, we list the reference

“Trim Up Resistance” for increasing the output

voltage for every 1 percent (see Trim Table 1).

Fig 5. shows “Trim Up Resistance” value chart.

Trimming down the output voltage for a typical

circuit, as shown on Fig. 4.

Fig 4. Trim Down Output Voltage Circuit

For Trim down resistance value, we list the

reference “Trim Down Resistance” for decreasing

output voltage for every 1 percent (see Trim

Table 2.).

Fig 6 shows “Trim Down Resistance” value chart.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 6 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

0

10

20

30

40

50

60

2 3 4 5 6 7 8 9 10

Trim up Vout change %

Rtrim-up (K)

Fig 5. Trim Up Resistance for reference chart

0

50

100

150

200

250

2345678910

Trim down Vout change %

Rtrim-dn (K)

Fig 6 Trim Down Resistance for reference chart

Rtrim-up(K) Vout(v) Trim up Vout %

57.6 1.53 2

36.5 1.545 3

26.1 1.56 4

19.6 1.575 5

15.4 1.59 6

12.4 1.605 7

10.2 1.62 8

8.45 1.635 9

6.98 1.65 10

Table 1: Rtrim-up resistor values.

Rtrim-dn(K) Vout(v) Trim down Vou

t %

255 1.47 2

165 1.455 3

118 1.44 4

93.1 1.425 5

75 1.41 6

61.9 1.395 7

53.6 1.38 8

45.3 1.365 9

39.2 1.35 10

Table 2: Rtrim-down resistor values.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 7 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Protection Features

Input Under-voltage Lockout ( IUV )

Input under voltage lockout ( IUV ) is standard

with the SQ unit. The unit will shut down when the

input voltage drops below a threshold, and the

unit will turn on when the input voltage goes to

the upper threshold.

The hysteretic voltage of the under voltage

protection is 2 V, normally from the 33.5V to

35.5V range.

Output Over-current Protection ( OCP )

The unit will shut down when the over current or

short circuit condition exists.

Once the OCP happens, the unit has shut down.

The attempted restart will continue indefinitely

until the over current or short circuit condition is

removed. When OCP happens, the output

voltage drops below 1.1V.

Figure 19 shows output voltage vs. output current

limit point and the unit’s shutdown point.

Input voltage has almost no effect on the current

limit point.

Output Over-voltage Protection ( OVP )

The unit will shut down when the output voltage

exceeds the over voltage threshold.

If the output voltage across Vout(+) (pin8) and

Vout(-) (pin4) exceeds the threshold of the OVP

circuitry, the unit has shut down which is caused

by an OVP circuit, and the unit will never restart,

and the output voltage is below 0.5V.

Over Temperature Protection ( OTP )

The unit will shut down when the base plate

temperature exceeds the protection threshold.

The unit will shut down under the base plate

temperature over a 110°C condition to protect the

unit from overheating. The OTP circuit will turn

the unit off when OTP happens. Once the unit

has shut down, it will restart at the cycle when the

base plate temperature goes down.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 8 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Application and consideration

Input Source Impedance

The unit has been designed to be stable with no

external capacitors when used in a low

inductance input and output circuit.

However in many applications, the inductance

with the distribution from the power source to the

input of the unit can affect the stability of the unit.

The addition of 47uF electrolytic capacitor with an

Esr < 1Ω (at 100khz) across the input can

ensure the stability of the unit. Also in many

applications, the user has to use decoupling

capacitors at the output load, to ensure the hold

up time for the load.

Safety Requirements and Considerations

The unit meets the American and International

safety regulatory requirement UL60950, TUV EN

60950, CSA C22.2 No. 60950-00. Basic

insulation is also provided between the input side

and the output side.

To meet safety agencies requirements, an input

line fuse must be used external to the unit. An 8A

fuse or less with a normal blow rate must be used

to meet the safety agencies requirements

If the input source is non-SELV ( ELV or a

hazardous voltage greater than 60 Vdc and less

than or equal to 75 Vdc), for the unit output to be

considered meeting the requirements of safety

extra low voltage (SELV), all of the following must

be met:

• The input source is to be provided with

reinforced insulation from any hazardous

voltage, including the ac main.

• The input pins of the unit are not operator

accessible.

• For whole system, for safety agencies

requirements, and for the combination of

the unit’s input side (primary side) and the

unit’s output side (secondary side), verify

that under a single fault, hazardous

voltages do not appear at the unit’s output

side (secondary side).

• Never ground either of the input pins of

the unit without grounding one of the

output pins. This may allow a non-SELV

voltage to appear between the output pin

and ground.

Electromagnetic Compatibility ( EMC )

EMC requirements must be met at the end

product and system level from the customer. As

there is no specific standards dedicated to the

EMC of board-mounted DC/DC converter, which

exist. However the SQ Family unit has been

tested for EMC requirement levels.

With the addition of a simple external filter (see

Fig 7.), the SQ Family unit passes the FCC class

B test conducted and CEI IEC61204-3 Class B.

Fig 7. External filter circuit for EMC.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 9 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

With this addition of an external simple filter

circuit, we can easily meet the EMC agencies

requirements. The EMC test result is shown on

Fig 8 below.

Fig 8. EMC conducted test result

Input Transient Withstand

SQ unit can withstand input transient voltage with

100v/100ms pulse, and never be damaged.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 10 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Characterization

General information

The SQ unit has many operational characterized

aspects, including thermal derating, efficiency,

start up and down timing parameter, overshoot,

output ripple & noise, dynamic response to load,

and over current protection curves.

The following pages contain specific plots or

waveforms associated with the unit. Additional

comments for specific data are provided below.

Test Conditions

All data presented herein were taken with the unit

soldered to a test board, which is a 0.060” thick

printed circuit board. All measurements require

an airflow wind with airflow meter measuring the

airflow LFM value.

For the input line, a 47uF/100V electrolytic

capacitor with Esr < 1 Ω is used in the test. It is

better to make the 47uF capacitor closed to the

unit. For the output, a 10uf tantalum capacitor

with Esr < 0.12Ω and 1uF ceramic capacitor has

been used for the test.

Also it is better when these two capacitors are

close to the unit.

Note:

It is important to make sure that the components on

the unit do not exceed their rating.

Thermal Derating

For thermal derating, output current vs. ambient

temperature and airflow rates are tested, and the

test graphic is shown in Fig 23.

Ambient temperature was varied between 25°C

and 85°C, with airflow rates from 0 LFM to

300LFM (0 to 1.5 m/s).

Figure 23 shows that maximum output power

derating vs. ambient air temperature with airflow

rates of 0LFM through 300 LFM. At Vin=48v.

Figure 24 shows output power derating vs.

ambient aur temperature with airflow rates of

0LFM through 300LFM. At Vin=48v. ( Open

frame, without heatsink )

Efficiency

Efficiency vs. load current curve is given below.

The ambient temperature is 25°C, airflow is

200LFM(1m/s), and the input voltage is 36V, 48V,

and 75V conditions.

Figure 14 shows that Efficiency at nominal output

voltage vs. output current for various Input

voltage.

Start up

During the turn on transient using the On/Off pin

for full rated current and No load conditions, the

output voltage waveforms are given in the below.

Fig 9, Fig 10 and Fig 11 show that all different

kind of start up waveform.

Ripple and Noise

The output voltage waveform measured at No

load and Full load current, with 10uf tantalum and

1uf ceramic capacitor across to close the unit.

Figure 21 and Figure 22 show that output voltage

Ripple & Noise at Vin=48v and different load

condition.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 11 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Start up information

Scenario #1: Initial Start up from power supply

On/Off function enabled, the unit starts via input voltage Vin

See Fig 9.

Time Comments

t0 On/Off pin is On: system front-end power is switched

on, Vin to unit begins to rise.

t1 Vin crosses Under voltage lockout protection circuit

threshold: the unit enabled to be on

t2 The unit begins to turn on ( unit turn-on delay).

t3 Unit output voltage reaches 100% of normal

voltage.

For this example, the unit total start up time (t3- t1) is

typically 45ms.

Scenario #2: Initial Start up using On/Off Pin

With Vin previously powered, the unit starts via On/Off pin.

See Fig 10.

Time Comments

t0 Vin at nominal value.

t1 Arbitrary time when On/Off pin is enabled (Unit

enabled)

t2 End of unit turn-on delay

t3 Unit Vout reaches 100% of nominal voltage.

For this example, the unit total start up time (t3- t1) is

typically 70ms.

Scenario #3: Turn-off and restart using On/Off Pin

With Vin previously powered, the unit is disabled and then

enabled via On/Off pin. See Fig 11.

Time Comments

t0 Vin and Vout are at nominal values, On/Off pin

On.

t1 On/Off pin arbitrarily disabled, the unit output

falls to zero. Turn-on inhibit delay period

(100ms) is initiated, and On/Off pin action is

internally inhibited.

t2 On/Off pin is externally re-enabled.

If (t2- t1) ≤ 100ms, external action of On/Off pin

Is locked out by start up inhibit timer.

If (t2- t1) > 100ms, On/Off pin is On, the unit

begins turn-on; if off, the unit awaits On/Off pin

On signal; see Fig 11.

t3 Unit Vout reaches 100% of nominal voltage.

For the condition, (t2- t1) ≤ 100ms, the unit total start

up time (t5- t2) is typically 200ms. For (t2- t1) >

100ms , start up should be typically 45ms after release

of On/Off pin.

Fig 9. Start up waveform

Fig 10. Start up using On/Off pin

Fig 11. Turn off and restart using On/Off pin

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 12 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

On/Off Control Power Up/Down

Figure 12. Turn on timing vs. Input On/Off Pin.

Waveform 2 is output voltage, waveform 4 is negative

On/Off logic signal. At 48v input voltage, 20A output

current with 100uf output capacitance load.

Efficiency

55%

60%

65%

70%

75%

80%

85%

90%

95%

2.5 57.5 10 12.5 15 17.5 20 22.5 25

Load (A)

Eff. (%)

36V

50V

75V

Figure 14. Efficiency at nominal output voltage vs.

output current for various Input voltage. The unit

mounted on the 0.06” thick PCB with 300LFM air flow

(1.5/m) from pin 3 to pin 4 and Ta=25°C

Figure 13. Turn off timing vs. Input On/Off Pin.

Waveform 2 is output voltage, waveform 4 is negative

On/Off logic signal. At 48v input voltage, 20A output

current with 100uf output capacitance load.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 13 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Dynamic Response

Figure 15. Output voltage dynamic response at

Vin=48v Iout= 12~20A, 2.5A/us dynamic load.

waveform 2 is dynamic response via dynamic load.

waveform 4 is load current (2.5A/us); with 10uF output

capacitance load.

Overshoot

Figure 17. Output voltage over shoot and rise time at

Vin=48v, Iout = 0A; with 100uF output capacitance

load, and On/Off pin enabled to turn on the unit.

Figure 16. Output voltage dynamic response at

Vin=48v Iout= 12~20A, 2.5A/us dynamic load.

waveform 2 is dynamic response via dynamic load.

waveform 4 is load current (2.5A/us); with 2200uF

output capacitance load.

Figure 18. Output voltage over shoot and rise time at

Vin=48v, Iout=20A; with 100uF output capacitance

load, and On/Off enabled to turn on the unit.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 14 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Over Current and Short Circuit

0

0.5

1

1.5

2

2.5

0 5 10 15 20 25 30 35 40

output current (A)

output volt. (V)

Figure 19. Output voltage vs. output current limit point

and the unit shutdown point. Input voltage has almost

no effect on current limit point.

Ripple and Noise

Figure 21. Output voltage Ripple & Noise at Vin=48v,

Iout=0A, with 10uF tantalum cap. and 1uf ceramic

cap. output capacitance load.

Figure 20. Output waveform under short circuit

protection condition. Under 10mΩ short circuit during

restart at 48Vin.

Figure 22. Output voltage Ripple & Noise, at Vin=48v,

Iout=20A, with 10uF tantalum cap. and 1uf ceramic

cap. output capacitance load.

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 15 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Temperature derating

Ta(¢X

50

00

10

5

25

20

(A)

15

Iout

25

C ) 75 100

Tc=100¢X

0.5M/S

Free Air

C

1.5M/S

1.0M/S

Figure 23. Maximum output power derating vs.

ambient air temperature with airflow rates of 0LFM

through 300 LFM. At Vin=48v. ( without heatsink )

00

5

25

(A)

10

15

Iout

25

C )Ta(¢X

50 75 100

20

Tc=100¢X

0.5M/S

Free Air

C

1.5M/S

1.0M/S

Figure 24. Maximum output power derating vs.

ambient air temperature with airflow rates of 0LFM

through 300 LFM. At Vin=48v. (Open Frame, without

heatsink )

Technical Specification

SQ100-48-1.5, SQ100-48-1.5N 48Vin 1.5Vout 25A

Data Sheet

Broadband TelCom Power, Inc. 1719 S. Grand Avenue, Santa Ana, CA 92705 U.S.A. P 16 of 16

Tel.: 714-259-4888 • Fax: 714-259-0840 • www.btcpower.com • Email: sales@btcpower.com • PS SQ100-48-1.5 Rev2 3-14-02

Input reflected ripple current

Figure 25. Test set up for measuring Input reflected

ripple currents, ic and is.

Figure 26. Input reflected ripple current ic waveform

without input inductor. At Vin=48v, Iout=25A,

50ma/Div. ( current probe with 50mv/div )

Figure 27. Input reflected ripple current is waveform

With 10uH input inductor. At Vin=48v, Iout=25A,

50ma/Div ( current probe with 50mv/div)

For More Information, Please Contact

sales@btcpower.com support@btcpower.com

www.btcpower.com