MP3336 – DUAL-CHANNEL, FLASH LED DRIVER WITH I

MP3336 Rev.1.01

www.MonolithicPower.com

17

5/16/2017

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2017 MPS. All Rights Reserved.

in the loop control, and fault detections on this

channel are also disabled.

LED1/2 Open Protection

If VOUT - VLED1/2 < 110mV and VOUT > 5.5V,

the IC marks off the fault current source and

sets the fault bit FT_OVP but continues

switching. If both current sources are marked

off, the device stops switching and the mode

setting is reset. The fault bit FT_OVP is 1 until it

is read back or the power resets. If LED_EN1 is

set to 0, the feedback of the current source 1 is

not involved in loop control, and fault detection

on this channel is also disabled.

Output Over-Voltage Protection (OVP)

If VOUT > 5.5V, the device stops switching and

resumes normal condition until VOUT drops

below 5.2V. The fault bit FT_OVP is 1 until it is

read back or the power resets.

Junction Over-Temperature Protection

If LED_OTAD = 1, the flash current drops to the

stops switching and resets LED_MOD and

LED_EN1/2. The fault bit FT_OTP must be

cleared to 0 by a read-back or a power reset.

Time-Out Protection

If the device works in one of the flash modes—

hardware and level trigger mode—time-out

protection may be triggered. When the STR

input pulse is longer than the flash timer set by

FL_TIM, the device is disabled once the timer

ends. The device stops switching and resets

the mode setting, and the fault bit is 1 until it is

read back or the power is reset before

restarting.

Under-Voltage Lockout (UVLO) Protection

If VIN drops below the UVLO threshold, the

device stops and all of the registers are reset to

default.

I

master sends a seven-bit address followed by

an eighth read (Read: 1) or write (Write: 0) bit.

The following bit indicates the register address

to or from which the data is written or read. The

I