PWM

Control

Thermal

Shutdown

+150

IN

I

2

C

Interface

Error

Amplifier

Slope

Compensation

SDA

SCL

Control

Logic/

Registers

GND

OUT

LED

TORCH/

TEMP

TX

STROBE

ENABLE

SW

65 m:

86 m:

Over Voltage

Comparator

Soft-Start

2/4 MHz

Oscillator

UVLO

Input Voltage

Flash Monitor

OUT-VHR

Current Sense/

Current Limit

LM3648, LM3648TT

www.ti.com

SNVSA68B – OCTOBER 2014 – REVISED SEPTEMBER 2015

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Flash Mode

In Flash Mode, the LED current source (LED) provides 64 target current levels from 21.8 mA to 1500 mA. Once

the Flash sequence is activated the current source (LED) ramps up to the programmed Flash current by stepping

through all current steps until the programmed current is reached. The headroom in the current source can be

regulated to provide 21.8 mA to 1.5 A.

When the device is enabled in Flash Mode through the Enable Register, all mode bits in the Enable Register are

cleared after a flash time-out event.

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