This is one of the PWM Controller types.
Part Number: SDC606, SDC606G
Function: Current Mode PWM Controller
Package: DIP 8 Pin
Manufacturer: Shaoxing Devechip Microelectronics
See the preview image and the PDF file for more information.
SDC606 is a high-performance current mode control IC designed for AC/DC convertor, which supplies about continuous 12W output power at the universal AC input range from 85V to 265V.
1. Built-in oscillator
2. Built-in high voltage power transistor of 700V
3. High voltage start-up
4. Very low start-up and operating current
5. Low standby power consumption
6. Protections: OVP, UVLO, SCP, OLP and OTP
7. Built-in high precise current limit with temperature compensation
8. 12W and peak 15W output power at the universal AC input range
9. 15W and peak 18W output power at AC input 220V
10. Very few external components […]
1. Portable rechargeable power supply
2. Appliance controller power supply
3. Adaptor/charger for cell and other portable apparatus
4. DVD/DVB power supply, ATX standby power supply
The peak current (sensed on the IS pin) is set by the voltage on FB pin. By comparing the voltage on FB pin and the IS ramp voltage, the duty-cycle of the PWM modulator is thus adjusted to provide the necessary load current at the desired output voltage. FB can be controlled by internal control circuit and external feedback circuit.