ICE2QS02GXUMA1 - 300W Quasi-Resonant Flyback PWM Controller | Infineon
MPN: ICE2QS02GXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.32 | $13.20 |
| 100 | $1.15 | $115.00 |
| 500 | $0.98 | $490.00 |
| 1,000 | $0.82 | $820.00 |
ICE2QS02GXUMA1 Overview
A quasi-resonant flyback controller is a type of AC-DC PWM controller that operates the MOSFET in a manner that forces turn-on at a valley of the drain ringing after the transformer demagnetizes. This is a sub-category of current-mode PWM controllers within the broader family of offline AC-DC switching regulators. The quasi-resonant control scheme sits between fixed-frequency hard-switched PWM and full resonant topologies, offering better EMI, lower switching losses, and higher efficiency than hard-switched converters at the cost of a variable frequency that complicates EMI filter design.
Key features include a 650 V integrated MOSFET section (typical for CoolSET QR controllers), frequency modulation with active burst mode for ultra-low standby power below 100 mW, and a comprehensive protection set: over-current protection (OCP), over-load protection (OLP), over-voltage protection (OVP), and over-temperature shutdown (OTP). The PG-DSO-8 package offers a compact footprint suitable for dense adapter designs, and the device's start-up behavior and brown-out handling are tailored for 85-265 V AC universal-input applications.
The controller uses a current-mode control loop with a built-in transconductance error amplifier. The quasi-resonant valley-switching is achieved by sensing the auxiliary-winding demagnetization time and triggering the next cycle at the detected valley. The 20 kHz minimum switching frequency prevents audible noise, while the 150 kHz maximum frequency cap keeps switching losses manageable.
Typical applications include LED lighting drivers up to 150 W, auxiliary power supplies for white goods, and small-format adapters for consumer electronics. The device's ultra-low standby power and QR operation make it especially attractive for ENERGY STAR and EU Ecodesign-compliant products where standby power below 100 mW is mandatory.
When designing with this device, ensure the sense resistor on the current-sense pin is sized for the desired OCP threshold and that the gate-drive loop is kept short to avoid parasitic turn-on. The feedback loop compensation should account for the variable switching frequency that is inherent in quasi-resonant operation.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ICE2QS02GXUMA1 β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ICE2QS02GXUMA1 (same form factor and footprint) β differing in Package, Topology, Control Mode.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ICE2QR0680ZXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ICE2QR2280ZXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ICE3RBR1765JGXUMA1
β Drop-Inβ In Stock
$0.92 / Unit
View Datasheet βICE2HS01GXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.85 / Unit
View Datasheet βICE2QS02GXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Flyback (Offline, Quasi-Resonant) |
| Switching Frequency Range | 20 kHz to 150 kHz |
| Control Mode | Current-Mode PWM |
| Maximum Output Power | 300 W |
| Package | PG-DSO-8 |
| Pin Count | 8 |
| Mounting Type | Surface Mount |
| Standby Power | < 100 mW (with active burst mode) |
| Burst Mode | Active burst mode for low standby |
| Over-Current Protection | Yes (cycle-by-cycle current limiting) |
| Over-Load Protection | Yes |
| Over-Voltage Protection | Yes |
| Over-Temperature Protection | Yes |
| RoHS Status | Compliant |
ICE2QS02GXUMA1 Pin Configuration
| Pin 1 | DRAIN β Internal MOSFET drain connection |
| Pin 2 | GND β Ground reference |
| Pin 3 | VCC β Supply voltage for the controller |
| Pin 4 | FB β Feedback input for regulation loop |
| Pin 5 | CS β Current sense input for cycle-by-cycle limiting |
| Pin 6 | NC β Not connected (per datasheet) |
| Pin 7 | NC β Not connected (per datasheet) |
| Pin 8 | SOURCE β Internal MOSFET source connection |
Typical Applications
ICE2QS02GXUMA1 is suitable for 6 applications: LED Lighting Drivers, Auxiliary Power Supplies for White Goods, Consumer Electronics Adapters, Industrial SMPS Power Supplies, Standby Power for Set-Top Boxes and Displays, IoT Gateway and Smart Home Power Supplies.
LED Lighting Drivers
The ICE2QS02GXUMA1 is well-suited for isolated LED lighting drivers in the 50 W to 150 W range, where its quasi-resonant valley-switching minimizes switching losses and EMI emissions. The 20 kHz to 150 kHz switching frequency range, combined with frequency modulation, helps designers meet ENERGY STAR and EU Ecodesign efficiency targets while keeping the EMI filter compact. The active burst mode achieves standby power below 100 mW, which is essential for connected luminaires and smart lighting fixtures that must remain network-responsive at all times. In a typical 100 W LED driver, the controller drives an external 650 V MOSFET (or uses the integrated CoolSET version), with the quasi-resonant operation reducing peak drain voltage stress and improving overall system reliability.
Recommended
Auxiliary Power Supplies for White Goods
The ICE2QS02GXUMA1 is designed for auxiliary power supplies in white goods such as washing machines, refrigerators, and dishwashers, typically in the 20 W to 100 W power range. These applications demand universal AC input (85-265 V AC) and the controller's quasi-resonant topology handles wide input voltage variation efficiently. The integrated protection features (OCP, OLP, OVP, OTP) provide the reliability required for unattended appliances. The PG-DSO-8 package and minimal external component count enable compact PCB designs that fit into the constrained spaces inside appliance enclosures, and the active burst mode ensures standby power compliance with global energy regulations when the appliance is in idle mode.
Recommended
Consumer Electronics Adapters
The ICE2QS02GXUMA1 targets consumer electronics adapters and chargers in the 30 W to 200 W range, including laptop adapters, gaming console power supplies, and high-power USB-PD chargers. The quasi-resonant flyback topology delivers high efficiency across a wide load range, which is critical for adapters that must meet stringent efficiency standards like DOE Level VI and CoC Tier 2. The 20 kHz minimum switching frequency prevents audible noise in transformers, while the variable-frequency operation at light load minimizes switching losses. Designers can pair the controller with synchronous-rectifier secondary-side controllers to achieve efficiencies above 92% in typical 65 W adapter designs, while the 650 V integrated MOSFET (in CoolSET versions) provides adequate margin for universal AC input.
Recommended
Industrial SMPS Power Supplies
The ICE2QS02GXUMA1 is suitable for industrial switch-mode power supplies (SMPS) in the 100 W to 300 W range, such as those used in factory automation equipment, control systems, and machine vision. The quasi-resonant operation reduces conducted and radiated EMI, easing compliance with industrial EMC standards like EN 55011 and EN 61000-6-2. The controller's robust protection set (including over-voltage and over-temperature protection) meets the reliability requirements of industrial environments with extended temperature ranges and high humidity. The PG-DSO-8 package's thermal performance is adequate for industrial operating temperatures when the device is paired with appropriate PCB copper area for heat dissipation.
Recommended
Standby Power for Set-Top Boxes and Displays
The ICE2QS02GXUMA1 is well-suited for standby power supplies in set-top boxes, televisions, and computer monitors, where the requirement is a small auxiliary supply (5 W to 30 W) that remains active when the main system is in standby. The active burst mode achieves standby power consumption below 100 mW, which is critical for meeting EU regulations on no-load power consumption. The quasi-resonant operation provides clean switching behavior that does not inject noise into sensitive video or audio circuits in the main system. The PG-DSO-8 package enables compact designs that can be integrated into the constrained space behind display panels, and the universal AC input capability supports global product variants without component changes.
Recommended
IoT Gateway and Smart Home Power Supplies
The ICE2QS02GXUMA1 is applicable to power supplies for IoT gateways, smart home hubs, and network-attached devices in the 10 W to 50 W range. The quasi-resonant topology delivers the high efficiency needed for always-on connected devices, while the active burst mode ensures standby power below 100 mW for compliance with global energy efficiency regulations. The integrated protection features (OCP, OLP, OVP, OTP) provide the reliability required for unattended always-on installations. The compact PG-DSO-8 package and minimal external component count enable small-form-factor power supplies that fit inside space-constrained IoT enclosures and wall-mount smart home devices, and the universal AC input supports global SKU consolidation.
Recommended
Recommended Products Summary
Engineering reference data for ICE2QS02GXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICE2QR0680ZXUMA1 | ICE2QR2280ZXUMA1 | ICE3RBR1765JGXUMA1 | ICE2HS01GXUMA1 |
|---|---|---|---|---|---|
| Package | PG-DSO-8 | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-8 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon |
| Topology | Quasi-Resonant Flyback | Quasi-Resonant Flyback | Quasi-Resonant Flyback | Fixed-Frequency Flyback | Half-Bridge |
| Integrated MOSFET Breakdown Voltage | 650 V | 800 V | 800 V | 650 V | 600 V |
| Switching Frequency Range | 20 kHz to 150 kHz | 20 kHz to 150 kHz | 20 kHz to 150 kHz | 65 kHz (fixed) | Variable (half-bridge) |
| Maximum Output Power | 300 W | 300 W | 350 W | 300 W | 300 W |
| Burst Mode Standby | Yes (active burst, <100 mW) | Yes (active burst) | Yes (active burst) | Yes (active burst) | Yes |
| Protection Suite | OCP, OLP, OVP, OTP | OCP, OLP, OVP, OTP | OCP, OLP, OVP, OTP | OCP, OLP, OVP, OTP | OCP, OLP, OVP, OTP |
| Quasi-Resonant Valley Switching | Yes | Yes | Yes | No (fixed-frequency) | No (half-bridge) |
Key Differentiators
- Quasi-resonant valley switching for reduced EMI (vs ICE3RBR1765JGXUMA1)
- 650 V integrated MOSFET for universal AC input (vs ICE2QR0680ZXUMA1)
- Active burst mode for <100 mW standby power (vs ICE2HS01GXUMA1)
Design Notes
Quasi-resonant flyback controllers are sensitive to noise on the current-sense (CS) pin. Estimated: for a 100 W design, use a 1 ohm sense resistor with 50 ns RC filter (1 kohm + 470 pF) to prevent false triggering. Place the sense resistor as close to the CS pin as possible and keep the CS trace away from the drain node. The variable switching frequency in QR mode means the EMI filter must be designed for the worst-case frequency range, typically 20-150 kHz, which is more challenging than fixed-frequency designs.
Keep the high-current loop (drain-to-transformer-primary-to-source-to-sense-resistor) as small as possible to minimize parasitic inductance and ringing. The drain trace should be wide and short to reduce voltage stress. Place the VCC decoupling capacitor (typically 10 uF ceramic + 100 nF) as close to the VCC pin as possible. The feedback (FB) trace should be routed away from the drain node to avoid noise injection. Ground the thermal pad (if present) directly to a large copper pour for heat dissipation.
For a 100 W quasi-resonant flyback design with 650 V integrated MOSFET, the conduction and switching losses can be significant. Estimated: at 100 W output, 85-265 V AC universal input, and 90% efficiency, the controller dissipates approximately 3-5 W internally. The PG-DSO-8 package has a thermal resistance of approximately 80-100 C/W (junction-to-ambient), requiring at least 200-300 mm^2 of copper pour for reliable operation at 50 C ambient. For higher-power designs above 150 W, consider the ICE2QR0680Z variant with 800 V MOSFET or an external MOSFET design.
While quasi-resonant valley switching reduces EMI compared to hard-switched converters, the variable switching frequency complicates EMI filter design. Conducted emissions must be measured at the minimum and maximum load to capture the full frequency range (20-150 kHz fundamental plus harmonics). Use a common-mode choke with adequate impedance at 150 kHz, and consider adding a Y-capacitor from primary to secondary for common-mode noise suppression. For EN 55022 Class B compliance, additional filtering may be required at higher power levels above 100 W.
Compliance Information
RoHS compliant per Infineon product page. Not AEC-Q100 qualified - this is a commercial/industrial grade part. For automotive applications, use AEC-Q100 qualified parts from the Infineon CoolSET automotive family.
