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DAP011

PWM Current−Mode Controller for High−Power Universal Off−Line Supplies

ON Semiconductor 

DAP011/DAP011C

Soft−start and Fault Timer

The Speedking features an internal soft−start circuit

activated during the power on sequence (PON) but also

during skip cycle to reduce the acoustical noise (see skip

cycle section). As soon as VCC reaches VCCON, the peak

current is gradually increased from nearly zero up to the

maximum clamping level (e.g. 1.0 V / Rsense). The peak

current is clamped at 1.0 V / Rsense through the entire

soft−start period until the supply enters regulation.

Figure 30 shows a typical startup shot.

VCCON

12 V

6.9V

timer 3

10% of Timer or 500 ms at Skip Mode

Figure 30. Soft−start is Activated During a Startup Sequence an OCP Condition

(or During Skip−Cycle − 500 ms Skip Ramp)

VtimS+S

−

+

Vtimf+ault

−

+

VDD

soft−start ended

fault

Itim

skip, soft−start

IpFlag

power on reset

Figure 31. Soft−start is Activated During a Startup

Sequence, an OCP Condition (or During Skip−Cycle

− 500 ms Skip Ramp)

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