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Thursday, 14 March 2019

LED TV Backlight Circuit Useing MP3398A / MPS1728



Description : 
  The MP3398A is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source.

The MP3398A is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications. It is flexible to expand the number of LED channels by two or more ICs in parallel sharing a single inductive power source.

The MP3398A applies 4 internal current sources for current balance. The current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss.

The MP3398A can support both analog and PWM dimming independently to meet the different dimming-mode request. In addition, rich protection modes are also integrated including OCP, OTP, UVP, OVP, LED short/open protection, inductor/diode short protection.

Features : 

  • 4-String, Max 350mA/String WLED Drive
  • 5V to 28V Input Voltage Range
  • 2.5% Current Matching Accuracy Between Strings 
  • Programmable Switching Frequency 
  • PWM and Analog Dimming Mode 
  • Cascading Capability with a Single Power Source 
  • LED Open and Short LED Protection 
  • Programmable Over-Voltage Protection
  • Recoverable Thermal Shutdown Protection 
  • Over Current Protection
  • Inductor/Diode short Protection 
  • Under-Voltage Lockout 


Link : 
                Download This Circuit in pdf format.

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