OB2269 is a power management chip with the following pin function voltages:
< br >
VCC (pin 1) is the chip power input pin, the operating voltage range is 8V to 30V;
< br >
GND (pin 2) is the chip ground pin;
< br >
VIN (pin 3) is the input voltage pin of DC-DC, and its operating voltage range should be less than VCC;
< br >
FB (pin 4) is the feedback pin, and the input feedback signal controls the output voltage;
< br >
COMP (pin 5) adjusts the bandwidth of the control loop through the external RC network for the compensation pin;
< br >
CS (pin 6) is the current sampling pin for output current protection and current regulation;
< br >
GATE (pin 7) is the drive pin, which controls the switch of the power switch tube;
< br >
SD (pin 8) is a soft start pin, used to control the soft start time of the output voltage;
< br >
EN (pin 9) is the enable pin for the chip, which starts working when enabled and stops working when disabled.
OB2269 is a pwm control chip, the power supply pin voltage can not be higher than 25V, otherwise the chip will shut down.