With a 40V rated integrated switch FET, the SGM3750 is
a boost converter that drives LEDs in series. The boost
converter runs at 650kHz 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
sensor resistor RSET, and the feedback voltage is
regulated to 200mV, as shown in the typical application.
During the operation, the LED current can be controlled
using PWM signal through the CTRL pin. The duty cycle
of pulse width modulation (PWM) signal determines the
feedback reference voltage. In PWM mode, the
SGM3750 does not burst the LED current; therefore, it
does not generate audible noises on the output
capacitor. For maximum protection, the device features
integrated open LED protection that disables the
SGM3750 to prevent the output voltage from exceeding
the IC’s absolute maximum voltage ratings during open
LED conditions. SGM3750YTDI6G/TR SGM3750YTN6G/TR资料下载
