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.
Absolute Maximum Ratings
Note: Absolute maximum ratings are defined as ratings, which when
being exceeded may lead to destruction of the integrated circuit.
For the same reason make sure, that any capacitor that will be
connected to pin 7 (VCC) is discharged before assembling the
application circuit.
Parameter | Symbol | min. | max. | Unit | Remarks |
HV Voltage | VHV | - | 500 | V | |
VCC Supply Voltage | VVCC | -0.3 | 27 | V | |
FB Voltage | VFB | -0.3 | 5.0 | V | |
ZC Voltage | VZC | -0.3 | 5.0 | V | |
CS Voltage | VCS | -0.3 | 5.0 | V | |
GATE Voltage | VOUT | -0.3 | 27 | V | |
Maximum current out from ZC pin | IZCMAX | 3 | - | mA | |
Junction Temperature | Tj | -40 | 125 | °C | |
Storage Temperature | TS | -55 | 150 | °C | |
Thermal Resistance Junction -Ambient | RthJA | - | 90 | K/W | PG-DIP-8 |
ESD Capability (incl. Drain Pin) | VESD | - | 2 | kV | Human body model1) |
1) According to EIA/JESD22-A114-B (discharging a 100pF capacitor
through a 1.5kΩ series resistor)
Typical Application Circuit
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