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LM3642TLX-LT 数据表(PDF) 9 Page - Texas Instruments

部件名 LM3642TLX-LT
功能描述  Synchronous Boost LED Flash Driver
Download  30 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

LM3642TLX-LT 数据表(HTML) 9 Page - Texas Instruments

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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
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