CM3842/3843

2001/06/27

Advanced

Champion Microelectronic Corporation

Page 7

APPLICATION INFORMATION (continued)

Fig. 5. Shutdown Techniques - there are two ways to shutdown the PWM controller: 1) raise the voltage at

Fig 6. Slop Compensation – To achieve duty cycles over 50% for some applications , the above

slope compensation technique is suggested by resistively summing a fraction of the

oscillator ramp with the current sense signal.

Shutdown

500

Ω

Ω

Ω

Ω

To Current

Sense Resistor

330

Ω

Ω

Ω

Ω

1K

Shutdown

COMP

0.1

µµµµF

C