ICE1QS01G Infineon Technologies, ICE1QS01G Datasheet - Page 7

• 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

Soft start
The internal reference of the IC is switched on when V
begins to work with soft start mode. Soft start is realized with an internal soft start resistor, an inter-
nal current sink, a current source and the external feedback capacitor connected at pin SRC. The
internal resistor is connected between the internal voltage reference and pin SRC. The current sink
is connected between pin SRC and GND. The value of the current is set with a timer. Immediately
after the IC is switched on the capacitor C
rent source is switched off 12 µsec after beginning of soft start. The current value of the current sink
is set with a timer. Every three msec the current of the current sink is reduced and so V
increase stepwise. The soft start is finished 24 msec after the IC is switched on. At the end of the
soft start the current sink is switched off.
Figure: Soft Start
PCS (primary current simulation)
A voltage proportional to the current of the power transistor is generated at Pin PCS by the RC-com-
bination R2, C2. The voltage at Pin PCS is forced to 1.5V when the power transistor is switched off
and during its switch on time C2 is charged by R2 from the rectified mains. The relation of V
Version 1.4
VSRC2
VSRC1
VCCon
VSRC
VCC
ton
tp1
tp2
SRC
7
t
is charged with a current source up to 2.5V. This cur-
t
ICE1QS01
CC
counter
tp=3ms
down
timer
exceeds the V
up
t=24ms
t=12us
timer
timer
D/A
2.5V
CCon
current
500
sink
threshold. The IC
pin SRC
5V
ICE1QS01
20k
27 Apr 2004
SRC
PCS
and
can