ICE1QS01G Infineon Technologies, ICE1QS01G Datasheet - Page 14

• Manufacturer Part Number: ICE1QS01G
• Description: IC PFC CONTROLLER DSO8
• Manufacturer: Infineon Technologies

Specifications of ICE1QS01G

• Current - Startup: 60µA
• Voltage - Supply: 9 V ~ 20 V
• Operating Temperature: -25°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: DSO-8
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Switching: -
• Mode: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: SP000081002

Fold back point correction
With increasing mains voltage the switch on time becomes shorter and so the frequency becomes
higher. With higher frequency also the maximal possible output power becomes higher. With higher
power the danger in case of failure increases.
To avoid this, the foldback point correction circuit senses main voltage to reduce the on-time of the
switch. Mains voltage is sensed at the supply coil of V
During on-time of the MOS-FET switch current is pulled out from pin RZI. When this current is
higher than 500 µA, one fifth of the current higher than this threshold is driven into pin PCS to
increase the voltage slope charging the capacitor connected to this pin.
Figure: Fold Back Point Correction
Version 1.4
Vpcs
5V
t0
IPCSFO
Vpcs with fold back point correction
=
t1
IRZI 0
-------------------------------- - IRZI
Vpcs at high mains voltage
t2
–
5
Vpcs at low mains
5mA
voltage
,
t
500uA
14
t3
Pmax
CC
voltage via a resistor connected to pin RZI.
Pmax without fold back point correction
Pmax with fold back point correction
ICE1QS01
27 Apr 2004
Vmains