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BCT3756/E
High Efficiency, Support 0.3% PWM Dimming Boost WLED Driver
BCT3756/E
High Efficiency, Support 0.3% PWM Dimming Boost WLED Driver
GENERAL DESCRIPTION
The BCT3756/E is a white LED driver with integrated boost converter. With an internal 38V switch FET, the BCT3756/E drives up a string of up to 10 LEDs in series. The boost converter runs at 1.1MHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use of small external components.
The default white LED current is set with the external sense resistor RSET, and the feedback voltage is regulated to 200mV, as shown in the typical application. During the operation, a pulse width modulation (PWM) signal can be applied to the CTRL pin through which the duty cycle determines the feedback reference voltage.
BCT3756/E integrates built-in soft-start function to minimize the power supply inrush current. BCT3756/E also integrates over-current protection , LED open protection and over temperature protection(OTP) to prevent chip from entering abnormal operating conditions.
APPLICATIONS
Cellular Phones
Ultra Mobile Devices
Portable Media Players
PDAs, GPS Receivers
White LED Backlighting
FEATURES
Support 0.3% PWM dimming
1.1MHz Switching Frequency
38V Over-voltage Protection for up to 10 LEDs in Series
200mV Reference Voltage
100% Duty Cycle in Dropout Operation
2.7V to 5.5V Input Voltage Range
Over-current and Over-temperature Protection
Built-in Soft-start Limits Inrush Current
Package DFN2x2-6L
