ICE2QS03 Datasheet, PDF (3/19 Pages) Infineon Technologies AG – Quasi-Resonant PWM Controller

ICE2QS03
Quasi-Resonant PWM Controller
Product Highlight
• Active burst mode for low standby power
• Digital frequency reduction for better overall system efficiency
• Integrated power cell for IC self-power supply
Features
• Quasiresonant operation till very low load
• Active burst mode operation at light/no load for low
standby input power (< 100mW)
• Digital frequency reduction with decreasing load
• Power cell for VCC pre-charging with constant
current
• 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
ICE2QS03 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 overall 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. Based on the
BiCMOS technology, the product has a wide operation
range (up to 26V) of IC power supply and lower power
consumption. The numerous protection functions give
a full protection of the power supply system in failure
situations. All of these make the ICE2QS03 an
outstanding controller for quasi-resonant flyback
converter in the market.
Typical Application Circuit
85 ~ 265Vac
Dr1~Dr4
Power
Cell
CVCC
Cbus
RVCC
DVCC
RZC2
HV
VCC
ZC
Snubber
RZC1
CZC
Q1
GND
Control Unit
CFB
FB
Zero Crossing Detection
Power Management
Digital Process Block
Active Burst Mode
Protection Block
Current Mode Control
Gate
Driver
Current
Limitation
ICE2QS03
GATE
CS
RCS
Wp
DO
Ws
Lf
Cf
VO
CO
Wa
CPS
Rb1
CDS
Optocoupler
Rb2
Rovs1
Rc1
TL431
Cc1
Cc2
Rovs2
Type
ICE2QS03
Version 2.0
Package
PG-DIP-8-6
3
December 4, 2009