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| LR12 LR12 High Input Voltage Adjustable 3-Terminal Linear Regulator Features 13.2V to 100V Input Voltage Range Stable with 100nF output capacitor Adjustable 1.20V to 88V output regulation 5% reference voltage tolerance Output current limiting, 50mA min. 10A typical ADJ current Over temperature protection Available in 3 different packages General Description The Supertex LR12 is a high voltage, low output current, adjustable linear regulator. It has a wide operating input voltage range of 13.2V to 100V. The output voltage can be adjusted from 1.20V to 88V 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 LR12 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 LR12 has current limiting and temperature limiting. The output current limit is 100mA maximum and the minimum temperature limit is 125C. An output short circuit current will therefore be limited to 100mA maximum. 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 LR12 turns off when an external voltage greater than the output voltage of the LR12 is applied to VOUT of the LR12. To maintain stability, a bypass capacitor of 100nF or larger and a minimum DC output current of 500A are required. The device is available in TO-92, SO-8, and TO-252 (D-PAK) packages. Applications DC/DC SMPS startup circuits Adjustable high voltage constant current sources Industrial Controls Motor Controls Battery Powered Systems Power Supplies Telecom Applications LED Drivers Automotive Applications LR12 Typical Application * VOUT 1.2V to 88V VIN 13.2V to 100V C1 VIN V ADJ OUT LR12 R1 C2 RLOAD R2 *Required for conditions where VIN is less than VOUT. A081605 A081605 1 LR12 Ordering Information Package Options SO-8 LR12LG LR12LG-G TO-2521 LR12K4 LR12K4-G TO-92 LR12N3 LR12N3-G Notes: 1. TO-252 supplied on 2000 piece carrier tape reels only -G indicates package is RoHS compliant "Green" Pin Configurations VOUT ADJ NC 1 2 3 4 8 7 6 5 VOUT VOUT VOUT VOUT VIN ADJ Absolute Maximum Ratings VIN-ADJ VOUT-ADJ VIN - VOUT Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range -0.5V to +120V -10V to +10V -0.5V to +120V -40C to +85C NC VIN SO-8 TO-92 TO-252 (D-PAK) -65C to +150C Electrical Characteristics Test conditions unless otherwise specified: -40C < TA < 85C. Symbol VIN - VOUT VOUT VOUT VOUT VOUT IOUT IOUT IOUT IADJ C2 Parameter Input to Output Voltage Difference Overall Output Voltage Regulation Line Regulation Load Regulation Temperature Regulation Output Current Limit Output Current Limit Minimum Output Current Adjust Output Current Minimum Output Load Capacitance 0.5 5 100 50 125 60 10 15 -1 50 Min 12 1.14 1.20 0.003 1.4 Typ Max 98.8 1.26 0.03 3.0 +1 100 0.5 Units V V %/V % % mA mA mA A nF dB C 120Hz, VOUT = 5V 13.2V DVOUT/DVIN Ripple Rejection Ratio TLIMIT Junction Temperature Limit ADJ VIN -40C to +125C VOUT A081605 2 LR12 Thermal Characteristics Package TO-92 SO-8 TO-252 Power Dissipation @ TA=25C 0.6W 1.8W 2.0W JC C/W 125 -- 6.25 JA C/W 170 55 50 Mounted on FR4 board, 25mm x 25mm x 1.57mm. Significant PD increase possible on ceramic substrate. Functional Block Diagram VIN Pass Element LR12 VOUT Overtemp & Overcurrent 6.5V 1K 1.2V 10A ADJ A081605 3 LR12 Typical Application Circuits * VOUT =5.0V R1 6.04K 1% R2 18.2K 1% VOUT = 1.20V 1+ R2 + IADJ R2 R1 VIN=17V to 100V V IN V ADJ OUT LR12 C1 C2 100nF Figure 1: High Input Voltage, 5.0V Output Linear Regulator * Required for conditions where VIN is less than VOUT. VIN=15V to 100V VAuxiliary + Vout1 + Vcc FB LR12 VIN V ADJ OUT Vout2 PWM IC Figure 2: SMPS Start-Up Circuit LR12 + VIN = 15V to 100V VIN VOUT ADJ IOUT = R 100nF 1.20V R Figure 3: High Voltage Adjustable Constant Current Source A081605 4 LR12 Typical Performance Curves Temperature Variation 1.30 VIN VOUT=1.2V VOUT (V) 1.25 LR12 ADJ 13.2V 2.4K 100nF 1.20 1.15 1.10 1.05 1.00 -50 -25 0 25 50 o 75 100 125 T(junction) ( C) Load Regulation 5.30 5.25 VIN V OUT = 5.0V IOUT LR12 VOUT (V) 5.20 5.15 ADJ 25V 18.2K 1% 6.04K 1% 100nF RLOAD 5.10 5.05 5.00 4.95 4.90 4.85 4.80 0 5 10 15 20 25 30 35 40 45 50 IOUT (mA) A081605 5 LR12 Typical Performance Curves 6 VOUT vs. VIN V IN V OUT = 5.0V 5 LR12 ADJ 0V to 50V 18.2K 1% 6.04K 1% 100nF 1K VOUT (V) 4 3 2 1 0 0 20 40 60 80 100 VIN (V) Ripple Rejection -65 Ripple Rejection Ratio (dB) VIN VOUT = 5.0V IOUT LR12 20VP-P @ 120Hz 65V ADJ 6.04K 1% 100nF 18.2K 1% RLOAD -64 -63 -62 -61 -60 0 10 20 30 40 50 IOUT (mA) Current Limit 100 90 IC (mA) 80 70 60 50 -40 -20 0 20 40 o 60 80 100 A081605 Temperature ( C) 6 LR12 Typical Performance Curves Load Transient Response V IN VOUT=5.0V LR12 ADJ 6.04K 1% 100nF 18.2K 1% 10K 509 SW Open Closed SW 25V VOUT 200mV/div Load Transient Response, Load = 509 Line Transient Response 100V VIN VIN 0V LR12 ADJ 6.04K 1% 100nF 18.2K 1% 10K VOUT VIN 50V/div VOUT 5V/div Line Turn On/Off Response VIN 50V/div VIN 50V/div VOUT 5V/div VOUT 5V/div Line Power Up Transient Line Power Down Transient A081605 7 LR12 3 Lead TO-92 Plastic Package (N3) 0.190 0.020 (4.826 0.508) 0.190 0.020 (4.826 0.508) D 0.050 MAX (1.270) Uncontrolled Lead Dia. 5 NOM A 0.500 MIN (12.700) 0.018 Tp y (0.457) Seating Plane L 123 b 0.015 0.005 Typ (0.381 0.127) Before Lead Finish C e1 0.050 0.005 (1.270 0.127) 0.100 0.005 (2.540 0.127) e H 0.050 0.005 (1.270 0.127) 0.140 0.005 (3.556 0.127) 10 NOM 1 0.090 R NOM (2.286) 23 E 8-Lead Small Outline Package (LG, TG) 0.192 0.005 (4.8895 0.1143) D H 0.236 0.008 (5.9944 0.2032) E H1 0.154 0.004 (3.9116 0.1016) 0.193 0.012 (4.9022 0.3048) 7 (4 PLCS) 0.010 0.002 C (0.254 0.0508) 45 h 0.020 0.009 (0.508 0.2286) 0.061 0.008 A (1.5494 0.2032) e A1 B L1 0 - 8 0.016 0.002 (0.4064 0.0508) L 0.007 0.003 (0.1778 0.0762) 0.050 TYP. (1.270) 0.035 0.015 (0.889 0.381) 0.0275 0.0025 (0.6985 0.0635) Note: Circle (e.g. B ) indicates JEDEC Reference. Measurement Legend = Dimensions in Inches (Dimensions in Millimeters) A081605 8 LR12 Doc.# DSFP-LR12 A081605 A081605 9 |
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