Supertex inc. LR8 High Input Voltage, Adjustable 3-Terminal Linear Regulator Features General Description 13.2 - 450V input voltage range Adjustable 1.20 - 440V output regulation 5% output voltage tolerance Output current limiting 10A typical ADJ current Internal junction temperature limiting Applications Off-line SMPS startup circuits Adjustable high voltage constant current source Industrial controls Motor controls Battery chargers Power supplies The Supertex LR8 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 13.2 - 450V. The output voltage can be adjusted from 1.20 - 440V provided that the input voltage is at least 12V greater than the output voltage. The output voltage can be adjusted by means of two external resistors R1 and R2 as shown in the typical application circuits. The LR8 regulates the voltage difference between VOUT and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R1 and R2. An internal constant bias current of typically 10A is connected to the ADJ pin. This increases VOUT by a constant voltage of 10A times R2. The LR8 has current limiting and temperature limiting. The output current limit is typically 20mA and the minimum temperature limit is 125C. An output short circuit current will therefore be limited to 20mA. When the junction temperature reaches its temperature limit, the output current and/or output voltage will decrease to keep the junction temperature from exceeding its temperature limit. For SMPS start-up circuit applications, the LR8 turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8. To maintain stability, a bypass capacitor of 1.0F or larger and a minimum DC output current of 500A are required. The device is available in TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92 packages. Typical Application Circuit * VIN VIN C1 VOUT VOUT LR8 ADJ R1 C2 RLOAD R2 * Required for conditions where VIN is less than VOUT. Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com LR8 Ordering Information Pin Configurations Package Options Device LR8 TO-252 (D-PAK) LR8K4-G VOUT TO-243AA (SOT-89) TO-92 LR8N3-G ADJ VIN LR8N8-G VIN ADJ VOUT TO-252 (K4) -G indicates package is RoHS compliant (`Green') TO-92 (N3) VOUT ADJ VOUT VIN TO-243AA (SOT-89) (N8) Absolute Maximum Ratings Product Marking Parameter Value VIN input voltage (voltages ref to ADJ) -0.5V to +480V Output voltage range -0.5V to +470V Operating ambient temperature range -40C to +85C Operating junction temperature range -40C to +125C Storage temperature range -65C to +150C Si YYWW LR8K4 LLLLLLL YY = Year Sealed WW = Week Sealed L = Lot Number = "Green" Packaging Package may or may not include the following marks: Si or TO-252 (K4) Y = Last Digit of Year Sealed W = Code for Week Sealed L = Lot Number = "Green" Packaging SiLR 8 YWLL Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Package may or may not include the following marks: Si or TO-92 (N3) LR8W W = Code for Week Sealed = "Green" Packaging Package may or may not include the following marks: Si or TO-243AA (SOT-89) (N8) Electrical Characteristics (Test conditions unless otherwise specified: -40C < TA < 85C.) Sym Parameter Min Typ Max Units Conditions VIN - VOUT Input to output voltage difference 12 - 450 V --- VOUT Overall output voltage regulation 1.14 1.20 1.26 V 13.2V < VIN< 400V, R1 = 2.4K, R2 = 0 VOUT Overall output voltage regulation 375 400 425 V R1 = 2.4K, R2 = 782K 17V < VIN< 400V, VOUT = 5V, IOUT = 0.5mA VOUT Line regulation - 0.003 0.01 %/V VOUT Load regulation - 1.4 3.0 % VIN = 17V, VOUT = 5V, 0.5mA <IOUT< 10mA VOUT Temperature regulation -1 - +1 % VIN = 17V, VOUT = 5V, IOUT = 10mA, -40C < TA < 85C IOUT Output current limit 10 - 30 mA TJ < 85C, VIN - VOUT = 12V IOUT Output current limit - - 0.5 mA TJ > 125C, VIN - VOUT = 450V Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 2 LR8 Electrical Characteristics (cont.) (Test conditions unless otherwise specified: -40C < TA < 85C.) Sym Parameter Min Typ Max Units Conditions - 0.3 0.5 mA Includes R1 and load current IOUT Minimum output current IADJ Adjust output current 5.0 10 15 A --- C2 Minimum output load capacitance 1.0 - - F --- Ripple rejection ratio 50 60 - dB 120Hz, VOUT = 5V Junction temperature limit 125 - - C --- DVOUT/DVIN TLIMIT Thermal Characteristics Power Dissipation Package jc ja @ TA = 25C C/W C/W TO-92 0.74W 125 170 TO-243AA 1.6W 15 78 TO-252 2.5W 6.25 50 Note: Mounted on FR4 board, 25mm x 25mm x 1.57mm. Functional Block Diagram VIN Pass Element Overtemp & Overcurrent LR8 Supertex inc. VOUT 1.2V 10A ADJ 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 3 LR8 Typical Application Circuits Figure 1: High Input Voltage, 5.0V Output Linear Regulator * VIN = 17 to 450V VOUT = 5.0V VIN VOUT R1 6.04k 1% LR8 ADJ C1 C2 1.0F R2 18.2k 1% * Required for conditions where VIN is less than VOUT RLOAD 16.5k VOUT = 1.20V 1+ R2 R1 + IADJ R2 Figure 2: SMPS Start-Up Circuit VIN = (VOUT + 12V) to 450V + VAUXILIARY VOUT1 - VIN VOUT LR8 ADJ + VOUT1 VCC FB PWM IC Figure 3: High Voltage Adjustable Constant Current Source + VIN LR8 VOUT R IOUT = 1.20V R ADJ VIN = (VOUT + 12V) to 450V 1.0F Load - Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 4 LR8 Typical Performance Curves Temperature Variation 1.30 LR8 1.20 ADJ 12V 1.25 VOUT = 1.2V 2.4k 1.0F VOUT (V) VIN 1.15 1.10 1.05 1.00 -50 -25 0 25 50 75 100 125 T (junction) (OC) Adjustment Current 12 11 VOUT = 1.2V LR8 10 ADJ 12V, 200V 400V 2.4k IADJ 1.0F IADJ (A) VIN VIN = 400V VIN = 12V 9 8 VIN = 200V 7 6 -50 -25 0 25 50 75 100 125 T (junction) (OC) Load Regulation 5.2 LR8 VOUT = 5.0V IOUT 5.1 6.04k 1% ADJ 25V 1.0F RLOAD VOUT (V) VIN 5.0 18.2k 1% 4.9 4.8 0 2 4 6 8 IOUT (mA) Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 5 10 LR8 Typical Performance Curves (cont.) VOUT vs. VIN 6 LR8 VOUT = 5.0V 5 6.04k 1% ADJ 4 1.0F 0V to 50V VOUT (V) VIN 1k 18.2k 1% 3 2 1 0 0 10 20 30 40 50 8 10 VIN (V) Ripple Rejection -65 65V ADJ 6.04K 1% 1.0F RLOAD 18.2K 1% -64 -63 -62 -61 -60 0 2 4 6 IOUT (mA) 30 25 lCL (mA) 20VP-P @ 60Hz LR8 IOUT VOUT = 5.0V Ripple Regection Ratio (dB) VIN 20 15 10 -40 -20 0 20 40 60 80 100 Temperature ( C) O Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 6 LR8 Typical Performance Curves (cont.) Load Transient Response VIN LR8 VOUT = 5.0V Closed SW 6.04k 1% ADJ 1.0F 25V sw Open 532 VOUT 10k 18.2k 1% Load Transient Response Line Transient Response 400V VIN 0V VIN LR8 VOUT = 5.0V 400V 6.04k 1% ADJ VIN 1.0F 18.2k 1% 10k 0V VOUT 0V Line Transient Response 400V 400V VIN VIN 0V 0V 5.0V 5.0V VOUT 0V VOUT 0V Line Power Up Transient Supertex inc. Line Power Down Transient 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 7 LR8 3-Lead TO-252 D-PAK Package Outline (K4) b3 E A c2 E1 4 L3 1 D1 H D 1 2 3 L4 L5 Note 1 b2 Front View View B b e Side View Rear View Gauge Plane A1 Seating Plane L2 L L1 View B Note: 1. Although 4 terminal locations are shown, only 3 are functional. Lead number 2 was removed. Symbol Dimension (inches) A A1 b b2 b3 c2 D D1 E E1 MIN .086 .000* .025 .030 .195 .018 .235 .205 .250 .170 NOM - - - - - - .240 - - - MAX .094 .005 .035 .045 .215 .035 .245 .217* .265 .200* e .090 BSC H L .370 .055 - .060 .410 .070 L1 .108 REF L2 .020 BSC 1 .035 0 0O - - - .040 .060 10 L3 L4 L5 .035 .025* .050 JEDEC Registration TO-252, Variation AA, Issue E, June 2004. * This dimension is not specified in the JEDEC drawing. This dimension differs from the JEDEC drawing. Drawings not to scale. Supertex Doc. #: DSPD-3TO252K4, Version F040910. Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 8 O O 15O LR8 3-Lead TO-92 Package Outline (N3) D A Seating Plane 1 2 3 L b e1 e c Side View Front View E1 E 3 1 2 Bottom View Symbol Dimensions (inches) A b c MIN .170 .014 NOM - - MAX .210 .022 .014 .022 D E E1 e e1 L .175 .125 .080 .095 .045 .500 - - - - - - .205 .165 .105 .105 .055 .610* JEDEC Registration TO-92. * This dimension is not specified in the JEDEC drawing. This dimension differs from the JEDEC drawing. Drawings not to scale. Supertex Doc.#: DSPD-3TO92N3, Version E041009. Supertex inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 9 LR8 3-Lead TO-243AA (SOT-89) Package Outline (N8) D D1 C E H L 1 2 E1 3 b b1 e A e1 Side View Top View Symbol Dimensions (mm) A b b1 C D D1 E E1 e MIN 1.40 0.44 0.36 0.35 4.40 1.62 2.29 2.00 NOM - - - - - - - - MAX 1.60 0.56 0.48 0.44 4.60 1.83 2.60 2.29 1.50 BSC e1 3.00 BSC H L 3.94 0.73 - - 4.25 1.20 JEDEC Registration TO-243, Variation AA, Issue C, July 1986. This dimension differs from the JEDEC drawing Drawings not to scale. Supertex Doc. #: DSPD-3TO243AAN8, Version F111010. (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to http://www.supertex.com/packaging.html.) Supertex inc. does not recommend the use of its products in life support applications, and will not knowingly sell them for use in such applications unless it receives an adequate "product liability indemnification insurance agreement." Supertex inc. does not assume responsibility for use of devices described, and limits its liability to the replacement of the devices determined defective due to workmanship. No responsibility is assumed for possible omissions and inaccuracies. Circuitry and specifications are subject to change without notice. For the latest product specifications refer to the Supertex inc. (website: http//www.supertex.com) Supertex inc. (c)2011 Supertex inc. All rights reserved. Unauthorized use or reproduction is prohibited. Doc.# DSFP-LR8 A030911 1235 Bordeaux Drive, Sunnyvale, CA 94089 Tel: 408-222-8888 www.supertex.com 10