LED Drivers for LCD Backlights
White LED Diver for
Backlight of Medium/Large-sized LCDs
BD9271KUT is a white LED diver used on backlight of
Medium/Large-sized LCDs. This IC can achieve
dimming function by SPI control. And through the SPI
correspondence, it can set the ON/OFF of each switch,
analog dimming and etc. The signals of PWM dimming
can set the frequency, ON time and delay of PWM by
inputting the external signals to the register.
BD9271KUT has equipped several protection functions
to deal with the abnormal states, including LED OPEN
protection, LED SHORT protection, external current
setting resistance SHORT protection, external MOS
transistor SHORT protection, etc. So it can be used in a
wide output voltage range and various load conditions.
■ VCC power supply range：
■ DVDD power supply range：
■ CLK frequency setting range：
■ Operating Circuit current range：
■ Operating temperature range：
TV, PC display
Other LCD backlight
Typical Application Circuit
■ 16-ch constant current driver (external FET(NMOS）is
■ LED voltage can be set externally.
■ PWM dimming and Analogue dimming can be
controlled by SPI.
■ LED Abnormal operation detection circuit (OPEN
protection/ SHORT protection) is equipped.
■ LED SHORT protection detection voltage is adjustable
■ LED SHORT protection detection CH
■ FAIL INDICATION function is equipped by ERR_DET
■ 3 lines serial interface
■ Package: TQFP64U
W(Typ.) D(Typ.) H(Max.)
Figure 1. TQFP64U
Figure 2. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
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○This product is not designed protection against radioactive rays