Semiconductor
S3843
Current Mode PWM Controller
Descriptions
The S3843 is fixed Current PWM controller for Off-line and DC-DC converter applications.
The internal circuits feature a trimmed oscillator for precise duty cycle control, a temperature compensated reference, high gain error amplifier current sensing comparator, and a high current totempole output for driving a power
MOSFET.
Protection circuitly includes built in under
voltage lockout and current limiting.
S3843 have UVLO threshold of 8.
4V(on) and 7.
6V(off) , S3843 can operate within 100% duty cycle.
Features
• Optimized for off-line and DC to DC converters • Low start up current 1 mA • Operating range up to 500 KHz • Pulse-by...