MP4655 9-35V LED Current and System Voltage Controller SOIC

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MP4655 9-35V LED Current and System Voltage Controller SOIC

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MPS SOIC LED Drivers LED Controller Power Management

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MP4655 9-35V LED Current and System Voltage Controller SOIC

The MPS MP4655 is a LED Current and System Voltage Controller. It operates from a 9 V to 35 V input. It is supplied in a SOIC package.

The MP4655 is a pure, single-stage, LLC, LED current and system voltage controller for LED backlighting, especially in larger TVs, and is located on the secondary side.

Key Specifications

Part Number	MP4655
Function	LED Current and System Voltage Controller
Input Voltage	9 V to 35 V
Interface	PWM
Package	SOIC
Ordering Codes	MP4655

Features

Pure, 1-Stage LLC for LED Current and System Supply Voltage Regulation
CC/CV Frequency Control Loop and Duty Cycle Control Loop
Audible Noise Elimination
9V to 35V Input Voltage Range
Deep and Fast PWM Dimming
Analog Dimming with DC or Pulse Input Signal
Input Under-Voltage Lockout (UVLO)
System Supply Over-Voltage Protection (OVP)
System Supply Short Protection
LED Open, LED Short Protection

Typical Application Circuit

Applications

LCD TVs and Monitors
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.