SCY99079DDR2G Просмотр технического описания (PDF) - ON Semiconductor

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SCY99079DDR2G

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

ON Semiconductor 

VCC

VCC(on)

VCC(min)

VCClatch

VCCreset

VFB

IpFlag

DAP018A/B/C/D/F

Vout is overloaded (aux is alive)

Reg.

Duration given

by timer

Timer

Drv

< 100ms

100ms

100ms

Figure 36. This Case is Similar to a Short−circuit where Vaux does NOT Collapse

3. A third case exists where the short−circuit makes

the auxiliary level go below VCC(min). In that case,

the timer length is truncated and all pulses are

stopped. The double hiccup fault mode is entered

and the SMPS tries to re−start. When the fault is

removed, the SMPS resumes operation.

VCC

VCC(on)

VCC(min)

VCClatch

VCCreset

VFB

Vout is shorted (aux is gone)

Reg.

Duration given

by aux. cap.

IpFlag

Timer

Drv

< 100ms

< 100ms

Figure 37. This Case is Similar to a Short−circuit where Vaux Does Collapse

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