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LM3642TLX-LT 数据表(PDF) 9 Page - Texas Instruments |
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LM3642TLX-LT 数据表(HTML) 9 Page - Texas Instruments |
9 / 30 page VOVP PWM Control Thermal Shutdown +150 oC IN VREF I 2 C Interface Error Amplifier Slope Compensation SDA SCL Control Logic/ Registers GND OUT LED STROBE TORCH/TX SW 80 m: 80 m: Over Voltage Comparator ILED Soft-Start 4 MHz Oscillator UVLO Input Voltage Flash Monitor OUT-VHR Current Sense/ Current Limit LM3642 www.ti.com SNVS891H – SEPTEMBER 2012 – REVISED SEPTEMBER 2015 7 Detailed Description 7.1 Overview The LM3642 is a high-power white LED flash driver capable of delivering up to 1.5 A into a single high-powered LED. The device incorporates a 4-MHz constant frequency-synchronous current-mode PWM boost converter and a single high-side current source to regulate the LED current over the 2.5-V to 5.5-V input voltage range. The LM3642 PWM converter switches and maintains at least VHR across the current source (LED). This minimum headroom voltage ensures that the current source remains in regulation. If the input voltage is above the LED voltage + current source headroom voltage, the device does not switch and turns the PFET on continuously (Pass Mode). In Pass Mode the difference between (VIN – ILED × RPMOS) and the voltage across the LED is dropped across the current source. The LM3642 has two logic inputs including a hardware Flash Enable (STROBE) and a Flash Interrupt input (TX/TORCH) designed to interrupt the flash pulse during high battery current conditions. Both logic inputs have internal 300-k Ω (typical) pulldown resistors to GND. Control of the LM3642 is done via an I2C-compatible interface. This includes adjustment of the Flash and Torch current levels, changing the Flash Timeout Duration and changing the switch current limit. Additionally, there are flag and status bits that indicate flash current time-out, LED failure (open/short), device thermal shutdown, and VIN undervoltage conditions. 7.2 Functional Block Diagram Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: LM3642 |
类似零件编号 - LM3642TLX-LT |
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类似说明 - LM3642TLX-LT |
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