High Input Voltage Adjustable 3-Terminal Linear Regulator

Transcription

1 High Input Voltage Adjustable 3-Terminal Linear Regulator Features 13.2V to 100V Input Voltage Range Stable with output capacitor Adjustable 1.20V to 88V output regulation 5% reference voltage tolerance Output current limiting, 50mA min. 10µA typical current Over temperature protection Available in 3 different 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 General Description The Supertex 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 R 1 and R 2 as shown in the typical application circuits. The regulates the voltage difference between and pins to a nominal value of 1.20V. The 1.20V is amplified by the external resistor ratio R 1 and R 2. An internal constant bias current of typically 10µA is connected to the pin. This increases by a constant voltage of 10µA times R 2. The has current limiting and temperature limiting. The output current limit is 100mA maximum and the minimum temperature limit is 125 C. 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 turns off when an external voltage greater than the output voltage of the is applied to of the. To maintain stability, a bypass capacitor of or larger and a minimum DC output current of 500µA are required. The device is available in TO-92, SO-8, and TO-252 (D-PAK) packages. Typical Application * 1.2V to 88V 13.2V to 100V C1 V OUT R1 C2 R LOAD R2 *Required for conditions where is less than. 1

2 Ordering Information Package Options SO-8 TO TO-92 LG K4 N3 LG-G K4-G N3-G Notes: 1. TO-252 supplied on 2000 piece carrier tape reels only -G indicates package is RoHS compliant Green Pin Configurations Absolute Maximum Ratings V to +120V NC NC SO TO-252 (D-PAK) - -10V to +10V -0.5V to +120V TO-92 Operating Ambient Temperature Range -40 C to +85 C Operating Junction Temperature Range Storage Temperature Range -40 C to +125 C -65 C to +150 C Electrical Characteristics Test conditions unless otherwise specified: -40 C < T A < 85 C. Symbol Parameter Min Typ Max Units Test Conditions - Input to Output Voltage Difference V Overall Output Voltage Regulation V 13.2V<<100V, R 1 = 2.4KΩ, R 2 = 0 Line Regulation %/V 15V<<100V, = 5V, I OUT = 0.5mA Load Regulation % = 15V, = 5V, 0.5mA<I OUT<50mA Temperature Regulation % = 15V, = 5V, I OUT = 10mA, -40 C<T A<85 C I OUT Output Current Limit ma T J < 85 C, - = 12V I OUT Output Current Limit 0.5 ma T J > 125 C, - = 100V I OUT Minimum Output Current 0.5 ma Includes R 1 and load current I Adjust Output Current µa C2 Minimum Output Load Capacitance 100 nf D/D Ripple Rejection Ratio db 120Hz, = 5V T LIMIT Junction Temperature Limit 125 C 2

3 Thermal Characteristics Package Power Dissipation θ JC θ T A=25 C C/W C/W TO W SO-8 1.8W 55 TO W Mounted on FR4 board, 25mm x 25mm x 1.57mm. Significant P D increase possible on ceramic substrate. Functional Block Diagram Pass Element Overtemp & Overcurrent 1.2V 6.5V 1KΩ 10μA 3

4 Typical Application Circuits * =17V to 100V C1 R2 R1 =5.0V C2 = 1.20V 1+ R2 R1 + I R2 Figure 1: High Input Voltage, 5.0V Output Linear Regulator * Required for conditions where is less than. =15V to 100V V Auxiliary + Vout1 - V OUT Vcc FB PWM IC + Vout2 - Figure 2: SMPS Start-Up Circuit + = 15V to 100V R I OUT = 1.20V R - Figure 3: High Voltage Adjustable Constant Current Source 4

5 Typical Performance Curves Temperature Variation V =1.2V 2.4KΩ VOUT (V) T(junction) ( o C) 5.30 Load Regulation 25V = 5.0V I OUT R LOAD (V) I OUT (ma) 5

6 Typical Performance Curves VOUT vs. VIN 6 = 5.0V 5 0V to 50V 1KΩ VOUT (V) VIN (V) Ripple Rejection V 120Hz 65V = 5.0V I OUT R LOAD Ripple Rejection Ratio (db) IOUT (ma) Current Limit IC (ma) Temperature ( o C) 6

7 Typical Performance Curves Load Transient Response =5.0V SW Open Closed SW 25V 10KΩ 509Ω 200mV/div Load Transient Response, Load = 509Ω Line Transient Response 100V 0V 10KΩ 50V/div 5V/div Line Turn On/Off Response 50V/div 50V/div 5V/div 5V/div Line Power Up Transient Line Power Down Transient 7

8 3 Lead TO-92 Plastic Package (N3) ± (4.826 ± 0.508) ± (4.826 ± 0.508) D A MAX (1.270) Uncontrolled Lead Dia. 5 NOM MIN (12.700) (0.457) Ty p b L Seating Plane ± (0.381 ± 0.127) Typ Before Lead Finish ± (1.270 ± 0.127) e 1 C ± (2.540 ± 0.127) e H ± (1.270 ± 0.127) (2.286) 10 NOM R NOM E ± (3.556 ± 0.127) 8-Lead Small Outline Package (LG, TG) ± ( ± ) D H ± E ( ± ) ± ( ± ) H ± ( ± ) 7 (4 PLCS) h ± (0.508 ± ) ± ( ± ) A ± C (0.254 ± ) 45 L 1 A ± ( ± ) e TYP. (1.270) B ± ( ± ) L ± (0.889 ± 0.381) ± ( ± ) Note: Circle (e.g. B ) indicates JEDEC Reference. Dimensions in Inches Measurement Legend = (Dimensions in Millimeters) 8

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