ICE1QS01 Datasheet, PDF(12/21 Page) Infineon Technologies AG – Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor Correction (PFC)

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ICE1QS01 Datasheet, PDF (12/21 Pages) Infineon Technologies AG – Controller for Switch Mode Power Supplies Supporting Low Power Standby and Power Factor Correction (PFC)

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ICE1QS01

Burst mode

12 Âµsec after beginning of softstart the burst mode comparator is activated. If VSRC falls below 2V

after activating the comparator the gate drive OUT is switched to low and the VCCoff threshold is

changed to 14.5 V. VCC decreases because gate drive is held low. If VCC reaches the VCCoff thresh-

old the IC is going into start-up mode. At VCCon threshold the IC is switched on again starting with

soft start modus. VCCoff threshold is set to the normal 9V.

Figure: Burst Mode

Secondary

load

high

low

VSRC

OUT

Vcc

15V

14.5V

VCCOFF

Vsec

normal mode

Version 1.4

burst mode

soft start

27 Apr 2004

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