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A8512EETTR-T Datasheet(PDF) 4 Page - Allegro MicroSystems |
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A8512EETTR-T Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 16 page LED Backlight Driver for LCD Monitors and Televisions A8512 4 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com Package LB Package LP Package ET Pin-out Diagrams 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 PWM FAULT LED6 LED5 LED4 LGND LGND LED3 LED2 LED1 COMP FSET EN PGND DRIVER VREG7V VIN AGND AGND VBIAS OVP SENSE2 SENSE1 ISET PAD 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 DGND PWM FAULT LED6 LED5 LED4 LGND LED3 LED2 LED1 COMP FSET EN PGND DRIVER VREG7V VIN VBIAS NC OVP SENSE2 SENSE1 ISET AGND PAD 21 20 19 18 17 16 15 1 2 3 4 5 6 7 LED5 LED4 LGND LGND LED3 LED2 LED1 DRIVER VREG7V NC VIN NC VBIAS OVP Terminal List Table Number Name Function ET LB LP 26 1 1 EN Device Enable. Apply logic-high signal to enable, low to shut down. 28 2 2 PGND Power ground for external FET gate driver. Connect directly to RSC ground and to common star ground. 1 3 3 DRIVER Gate driver terminal to drive external MOSFET. 2 4 4 VREG7V Gate driver supply from internal voltage regulator. Bypass with 0.1 to 1 μF ceramic capacitor to PGND. 4 5 5 VIN Input supply voltage for the IC. 11, 12 6, 7 12 AGND Analog (signal) GND for the IC. Connect to common star ground. 6 8 6 VBIAS Bias supply voltage from internal regulator. Bypass with 0.1 to 1 μF ceramic capacitor to AGND 7 9 8 OVP Overvoltage Protection terminal. Connect this pin to output capacitor through a resistor ROVP to set the OVP threshold. 8 10 9 SENSE2 Connect to ground side of current sense resistor RSC. 9 11 10 SENSE1 Connect to high side of current sense resistor RSC. 10 12 11 ISET Sets 100% Current through LED strings; connect RISET from ISET to AGND. 13 13 13 FSET Sets switching frequency; connect RFSET from FSET to AGND. 14 14 14 COMP Compensation pin; connect CCOMP (1 μF typical) capacitor to AGND. 15,16,17 15,16,17 15,16,17 LED1-3 LED current sinks; connect unused LEDx pins to ground to disable. 18,19 18,19 18 LGND LED current sink ground; connect to common star ground. 20,21,22 20,21,22 19,20,21 LED4-6 LED current sinks; connect unused LEDx pins to ground to disable. 23 23 22 ¯F¯¯A¯¯¯U¯¯L¯¯T¯ This open-drain output is pulled low when fault condition occurs; connect to external pull-up resistor. 24 24 23 PWM Pulse width modulation LED-current control; apply logic level PWM for dimming. 25 – 24 DGND Digital ground for input control signals (EN and PWM); connect to common star ground. 3,5,27 – 7 NC Not connected electrically. PAD – PAD PAD Exposed pad. Solder to GND plane for enhanced thermal dissipation. |
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