MP3391 9-35V, 8CH 8-Channel, 120mA/ch Step-Up WLED Driver Controller SOIC

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MP3391 9-35V, 8CH 8-Channel, 120mA/ch Step-Up WLED Driver Controller SOIC

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MPS SOIC LED Drivers WLED LED Controller Step-Up

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MP3391 9-35V, 8CH 8-Channel, 120mA/ch Step-Up WLED Driver Controller SOIC

The MPS MP3391 is a 8-Channel, 120mA/ch Step-Up WLED Driver Controller. It operates from a 9 V to 35 V input and drives 8 LED strings. It is supplied in a SOIC package.

The MP3391 is a step-up controller with 8- channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications.

Key Specifications

Part Number	MP3391
Function	8-Channel, 120mA/ch Step-Up WLED Driver Controller
Input Voltage	9 V to 35 V
Channels	8
Interface	PWM
Package	SOIC
Ordering Codes	MP3391

Features

9V to 35V Input Voltage Range
10V MOSFET Gate Driver
Drive Selectable 8, 6 and 4 Strings of LEDs
Maximum 120mA for Each String
2.5% Current Matching Accuracy Between Strings
Programmable Switching Frequency
PWM or DC Input Burst PWM Dimming
Open/Short protection and Fault Flag Output
Programmable Short Protection Voltage and Time Threshold
Programmable Over-voltage Protection

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.