MP3399 5-28V Cascading White LED Driver For Extending LED Channels SOIC

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MP3399 5-28V Cascading White LED Driver For Extending LED Channels SOIC

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pMPS MP3399 — Cascading White LED Driver For Extending LED Channels, 5-28V input, SOIC./p

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MP3399 5-28V Cascading White LED Driver For Extending LED Channels SOIC

The MPS MP3399 is a Cascading White LED Driver For Extending LED Channels. It operates from a 5 V to 28 V input. It is supplied in a SOIC package.

The MP3399 is a step-up controller with 12- channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications.

Key Specifications

Part Number	MP3399
Function	Cascading White LED Driver For Extending LED Channels
Input Voltage	5 V to 28 V
Interface	PWM
Package	SOIC
Ordering Codes	MP3399

Features

12 String, 60mA/String WLED Driver
Cascading Capability with a single Power Source
5V to 28V Input Voltage Range
Maximum 60mA for Each String
2.5% Current Matching Accuracy Between Strings
Programmable Switching Frequency
PWM or DC Input Burst PWM Dimming
Open and Short LED Protection
Programmable Over-voltage Protection
Under Voltage Lockout

Typical Application Circuit

Applications

Desktop LCD Flat Panel Displays
Flat Panel Video Displays

Design Notes

Channel-to-channel current matching sets backlight uniformity; check the matching spec at the current you will actually run.
In boost topologies the OVP threshold must clear the worst-case forward voltage of the longest string, including temperature and binning spread.
Keep PWM dimming above 200 Hz to stay clear of visible flicker, and away from the audio band if the product has a speaker.
Size the inductor and output capacitor for the string current ripple, not the total LED current.