ICE2QS01 Datasheet, PDF (3/17 Pages) Infineon Technologies AG – Quasi-resonant PWM Controller

ICE2QS01
Quasi-Resonant PWM Controller
Product Highlights
• Active burst mode for low standby power
• Digital frequency reduction for better overall
system efficiency
• Integrated power cell for IC self-power supply
ICE2QS01
PG-DIP-8
Features
• Quasiresonant operation till very low load
• Active burst mode operation at light load for low
standby input power (< 1W)
• Digital frequency reduction with decreasing load
• Power cell for VCC pre-charging and IC power supply
during latch-off, or standby mode operation when it is
necessary
• Built-in digital soft-start
• Foldback correction and cycle-by-cycle peak current
limitation
• Auto restart mode for VCC Overvoltage protection
• Auto restart mode for VCC Undervoltage protection
• Auto restart mode for openloop/overload protection
• Latch-off mode for adjustable output overvoltage
protection
• Latch-off mode for Short-winding protection
Description
ICE2QS01 is a quasi-resonant PWM controller
optimized for off-line switch power supply applications
such as LCD TV, CRT TV and notebook adapter. The
digital frequency reduction with decreasing load
enables a quasi-resonant operation till very low load.
As a result, the system efficiency is significantly
improved compared to other conventional solutions.
The active burst mode operation enables an ultra-low
power consumption at standby mode with small and
controllable output voltage ripple. The innovative
power cell solves the IC power supply problem when
the output voltage is pulled down during standby
mode, or during latch-off mode. The numerous
protection functions give a full protection of the power
supply system in failure situations. All of these make
the ICE2QS01 an outstanding controller for quasi-
resonant flyback converter in the market.
Typical Application
85 ~ 265 VAC
D_r1~D_r4
C_VCC
C_bus
R_VCC
D_VCC
R_ZC2
HV
Power
Cell
VCC ZC
Snubber
R_ZC1
C_ZC
D_ZC
Q₁
GND
C_REG
REG
PWM
Controller
Zero Crossing Detection
Power Management
Digital Process Block
Active Burst Mode
Protection Block
Current Mode Control
Gate
Driver
OUT
Current
Limitation
ICE2QS01
CS
R_CS
W_p
D_O
W_s
C_O
W_a
C_PS
R_b1
C_DS
Optocoupler
TL431
L_{f Cf}
V_O
R_b2
R_ovs1
R_c1
C_c1 C_c2
R_ovs2
Type
ICE2QS01
Version 2.1
Package
PG-DIP-8
3
October 2007