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E1QS01 Schematic ( PDF Datasheet ) - Infineon Technologies

Teilenummer E1QS01
Beschreibung ICE1QS01
Hersteller Infineon Technologies
Logo Infineon Technologies Logo 




Gesamt 21 Seiten
E1QS01 Datasheet, Funktion
Datasheet, V1.4, 27 April 2004
www.datasheet4u.com
ICE 1QS01
Controller for Quasiresonant
Switch Mode Power Supplies
Supporting Low Power Standby
and Power Factor Correction
Power Management & Supply
Never stop thinking.






E1QS01 Datasheet, Funktion
ICE1QS01
Functional Description
Start up
www.daAtansheinett4eur.ncoaml start up diode is connected between pin PCS and pin VCC. Start up current is provided
via this diode if VPCS is higher than VCC + VBE (VBE = Base-Emitter-Voltage).
During start up the internal reference of the IC is shut off and current consumption is about 60 µA.
There is only the start up circuitry working which determines the VCCon threshold. Gate driver OUT
is switched to low. An active shut down circuitry ensures that OUT is held below the MOS gate
threshold when the IC is in start up mode.
Block Diagram: Start Up
VCC
UVLO
PCS
ICE1QS01
OUT
Version 1.4
6
27 Apr 2004

6 Page









E1QS01 pdf, datenblatt
ICE1QS01
Burst mode
12 µsec after beginning of softstart the burst mode comparator is activated. If VSRC falls below 2V
after activating the
www.dactahshaenegt4eu.dcotmo 14.5 V.
comparator the gate drive OUT is
VCC decreases because gate drive
switched to low and the VCCoff threshold is
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
2V
OUT
Vcc
15V
14.5V
VCCOFF
9V
Vsec
normal mode
Version 1.4
burst mode
12
soft start
t
27 Apr 2004

12 Page





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