ICE2QS01
Quasi-Resonant PWM Controller
ICE2QS01
PG-DIP-8
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
Features
Description
•
•
Quasiresonant operation till very low load
ICE2QS01 is
a
quasi-resonant PWM controller
Active burst mode operation at light load for low
standby input power (< 1W)
optimized for off-line switch power supply applications
such as LCD TV, CRT TV and notebook adapter. The
digital frequency reduction with decreasing load
•
•
Digital frequency reduction with decreasing load
Power cell for VCC pre-charging and IC power supply enables a quasi-resonant operation till very low load.
during latch-off, or standby mode operation when it is As a result, the system efficiency is significantly
necessary
improved compared to other conventional solutions.
The active burst mode operation enables an ultra-low
•
•
Built-in digital soft-start
Foldback correction and cycle-by-cycle peak current power consumption at standby mode with small and
limitation
controllable output voltage ripple. The innovative
power cell solves the IC power supply problem when
•
•
•
•
Auto restart mode for VCC Overvoltage protection
Auto restart mode for VCC Undervoltage protection the output voltage is pulled down during standby
Auto restart mode for openloop/overload protection
Latch-off mode for adjustable output overvoltage
protection
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.
•
Latch-off mode for Short-winding protection
Typical Application
Lf
Wp
Wa
DO
Snubber
RZC1
Cf
VO
Cbus
Ws
85 ~ 265 VAC
RVCC
DVCC
RZC2
CO
CVCC
Dr1~Dr4
DZC
CZC
HV
VCC
ZC
CPS
Power
Q1
OUT
Cell
Rb1
CDS
Gate
Driver
Zero Crossing Detection
Power Management
Digital Process Block
Active Burst Mode
PWM
Rb2
Rovs1
GND
Controller
Optocoupler
Rc1
Current
CS
CREG
REG
Limitation
Protection Block
Current Mode Control
RCS
Cc2
Cc1
TL431
ICE2QS01
Rovs2
Type
Package
ICE2QS01
PG-DIP-8
Version 2.1
3
October 2007
INFINEON [ Infineon ]
