ICE2QR4765_10 Datasheet, PDF (14/21 Pages) Infineon Technologies AG – Off-Line SMPS Quasi-Resonant PWM Controller

CoolSET^® - Q1
ICE2QR4765
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
Limit Values
Unit
min. typ.
max.
14
23
33
kΩ
3.18 3.3
-
-
0.6
0.7
-
V
22
30
41
µs
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
Limit Values
Unit
min. typ.
max.
Test Condition
Soft-Start time
t_SS
8.5
12
-
ms
soft-start time step
t_{SS_S1)}
-
3
-
ms
Internal regulation voltage at
V_SS11)
-
1.76 -
V
first step
Internal regulation voltage step V_{SS_S1)}
-
0.56 -
V
at soft start
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
1.3
1.7
2.2
mA
-
0.66 -
V
Test Condition
I_zc=2.2mA, V_FB=3.8V
Version 2.1
14
February 5, 2010