With a 40V rated integrated switch FET, the SGM3733B
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 SGM3733B 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 SGM3733B to prevent the output voltage from
exceeding the IC’s absolute maximum voltage ratings
during open LED conditions. SGM3733BYTDI6G/TR-V1 SGM3733BYTN6G/TR-V1资料下载
