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TPS92640 Datasheet(PDF) 2 Page - Texas Instruments |
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TPS92640 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 10 page 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 VIN RON UDIM VOUT VREF IADJ COMP SDIM HG DAP SW BOOT VCC LG CS GND SDRV TPS92641 PWP Package (Top View) 1 2 3 4 5 6 7 14 13 12 11 10 9 8 VIN RON UDIM VOUT VREF IADJ COMP HG DAP SW BOOT VCC LG CS GND TPS92640 PWP Package (Top View) TPS92640 TPS92641 SNVS902 – NOVEMBER 2012 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. PIN CONFIGURATION PIN FUNCTIONS TPS92640 TPS92641 NAME DESCRIPTION 1 1 VIN Connect to input voltage. Connect 1µF bypass capacitor 2 2 RON Connect a resistor to VIN and capacitor to GND to set switching frequency. 3 3 UDIM Connect resistor divider from VIN to set under-voltage lockout threshold. 4 4 VOUT Connect resistor divider from VOUT, scaled down feedback of VOUT. 5 5 VREF Connect to top of resistor divider for IADJ. Bypass with 100nF ceramic capacitor. 6 6 IADJ Connect resistor divider from VREF or directly to VREF to set analog dimming level. Can be used for thermal fold-back also. 7 7 COMP Connect ceramic capacitor to GND to set loop compensation. 8 SDIM PWM dimming input for shunt FET dimming. 9 SDRV Connect to gate of external parallel NFET across LED load used for shunt dimming if desired. 8 10 GND System GND. Connect to DAP. 9 11 CS Connect to positive terminal of sense resistor at the bottom of the LED stack. 10 12 LG Connect to gate of low-side NFET of buck regulator. 11 13 VCC Bypass with 2.2µF ceramic capacitor to provide bias supply for controller. 12 14 BOOT Connect 100nF ceramic capacitor to switch node and diode to VCC to provide boosted voltage for high-side gate drive. 13 15 SW Connect to switch node of buck regulator. 14 16 HG Connect to gate of high-side NFET of buck regulator. DAP Place 6-9 vias from pad to GND plane for thermal relief Ordering Information ORDER NUMBER PACKAGE TYPE PACKAGE DRAWING SUPPLIED AS TPS92640PWP 94 Units in Rail TPS92640PWPT 14L TSSOP EXP PAD MXA14A 250 Units on Tape and Reel TPS92640PWPR 2500 Units on Tape and Reel TPS92641PWP 92 Units in Rail TPS92641PWPT 16L TSSOP EXP PAD MXA16A 250 Units on Tape and Reel TPS92641PWPR 2500 Units on Tape and Reel 2 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: TPS92640 TPS92641 |
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