ICE2QS03_11 Datasheet, PDF (14/19 Pages) Infineon Technologies AG – Quasi-Resonant PWM Controller

Quasi-Resonant PWM Controller
ICE2QS03
Electrical Characteristics
4.3.3
PWM Section
Parameter
Feedback Pull-Up Resistor
PWM-OP Gain
Offset for Voltage Ramp
Maximum on time in normal
operation
Symbol
R_FB
G_PWM
V_PWM
t_OnMax
min.
14
3.18
0.63
22
Limit Values
typ.
max.
23
33
3.3
-
0.7
-
30
41
Unit
k
-
V
s
Test Condition
4.3.4
Current Sense
Parameter
Symbol
Peak current limitation in normal V_CSth
operation
Leading Edge Blanking time
Peak Current Limitation in
Active Burst Mode
t_LEB
V_CSB
Limit Values
Unit
min. typ.
max.
0.97
1.03
1.09
V
200
330
460
ns
0.29
0.34
0.39
V
Test Condition
4.3.5
Soft Start
Parameter
Symbol
Soft-Start time
soft-start time step
Internal regulation voltage at
first step
Internal regulation voltage step
at soft start
t_SS
t_{SS_S1)}
V_SS11)
V_{SS_S1)}
Limit Values
Unit
min. typ.
max.
8.5
12
-
ms
-
3
-
ms
-
1.76
-
V
-
0.56
-
V
Test Condition
1) _{The parameter is not subjected to production test - verified by design/characterization}
4.3.6
Foldback Point Correction
Parameter
Symbol
ZC current first step threshold
ZC current last step threshold
CS threshold minimum
I_{ZC_FS}
I_{ZC_LS}
V_CSMF
Limit Values
Unit
min. typ.
max.
0.35
0.5
0.621 mA
1.8
2
2.2
mA
-
0.66
-
V
Test Condition
I_zc=2.2mA, V_FB=3.8V
Version 2.1
14
April 21, 2011