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BCT3758
WLED Driver with PWM Brightness Control and Flash Mode
BCT3758
WLED Driver with PWM Brightness Control and Flash Mode
GENERAL DESCRIPTION
The BCT3758 is a white LED driver with integrated boost converter. With an internal 40V switch FET, the BCT3758 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.
The BCT3758 can also be used as a light source for smartphone flashlights. The current of the flashlight can be adjusted via PWM CTRL .
BCT3758 integrates built-in soft-start function to minimize the power supply inrush current. BCT3758 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
200mV Reference Voltage in Backlight Mode
1000mV Reference Voltage in Flash Mode
350ms Flash Mode Timer
Support PWM Control for Flash Mode
1.1MHz Switching Frequency
38V Over-voltage Protection for up to 10
LEDs in Series
200mV Reference Voltage
2.7V to 5.5V Input Voltage Range
Over-current and Over-temperature
Protection
Built-in Soft-start Limits Inrush Current
Package DFN2x2-6L
