Power-Leverage Buck-Boost WLED Driver with Separate ADIM and PDIM
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The MP4603 is an integrated white LED driver. It uses MPS’s patent-pending technology to drive the backlights for LCD TVs measuring 60-inches or larger, for LED string voltages up to 350V. This novel technology can leverage the LED drive power by regulating only a small portion of the LED drive voltage—together with a fixed high-voltage source, a low-voltage LED driver can drive high voltage LED strings. This method allows for a super-high power density, higher efficiency and lower cost due to the low voltage stress, higher switching frequencies, and smaller passive components. The MP4603 is a current-mode–controlled buck-boost regulator. With a 12V input VINL and a high voltage source VINH, it can deliver a regulated voltage (VINH to VINH+68V) to drive a LED string with up to 100 LEDs. It can drive an external switch in series with the LED string to achieve over 1:1000 dimming ratio. Analog dimming can be applied at the same time to further improve the dimming ratio. Fault protections include LED open-string protection, output short-circuit protection, cyclebycycle peak current limiting, and thermal shutdown. The MP4603 is available in SOIC16 package.
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- Novel Power-Leverage-Control Technology
- Unique Step-Up/Down Operation
- Up to 99.5% Efficiency
- 0.5Ω Internal Power MOSFET
- Switching Frequency Synchronization
- Over 1:1000 Dimming Ratio
- Separate Analog and PWM Dimming
- ±5% 200mV Reference Voltage
- 10μA Shutdown Mode
- Cycle-by-Cycle Over-Current Protection
- Thermal Shutdown Protection
- LED String Open and Short Protection
- FAULT Output at LED Protection
- Output Short-Circuit Protection
- Available in SOIC16 Package
EV4603-S-00A Evaluation Kit Buck-Boost White LED Driver For TV Backlighting Applications
The EV4603-S-00A Evaluation Board is designed to demonstrate the capabilities of MPS’ MP4603ES for TV backlighting applications. MP4603 is an integrated Buck-Boost white LED driver which is suitable for TV and big panel backlighting applications with MPS patented pending technology.
With a 12V input VIN and a high voltage source VINH, EV4603-S-00A can deliver a regulated voltage (VINH to VINH+63V) to drive a LED string over 350V. The LED current is regulated to about 120mA. The EV4603-S-00A can be synchronized. Several EV4603-S-00As can be used together to drive a TV panel.