ACP2766.pdf
No.13131
? 2.7V to 5.5V Input Voltage Range
? 200mV Reference Feedback Voltage
? 1.2MHz Fixed Frequency
? Internal 38V Open LED Protection
? Integrated 40V,1.5A MOSFET
? 10~100KHz PWM Dimming Control Range
? Internal Soft Start
? Under-Voltage Protection
? Over Thermal Shutdown
? Low EMI and Improved PSRR
? TSOT26 Package Available
The ACP2766 is a step-up DC-DC converter which
operating as current source to drive white LEDs. The
light intensity of LEDs is proportional to the current
passing through them. The default white LEDs current is
set with the external resistor, and the feedback voltage
reference is set to 200mV. During the operation, the
LED current can be pulsed by adding a PWM signal to
the chip, through which the duty cycle changes the
feedback reference voltage. With fixed frequency of
1.2MHz, ACP2766 is allowed using tiny inductor and
capacitors to minimize the footprint. For maximum
protection, the chip features open LED protection
function that can disable the chip to prevent the output
voltage from exceeding voltage rating during open LED
conditions.
