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Infineon Technologies ICE2QS03GXUMA1
- Part No.:
- ICE2QS03GXUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICE2QS03GXUMA1.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 8DSO
- Quantity:
- Payment:
- Shipping:
Inventory:1,922
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Product details
Overview
ICE2QS03GXUMA1 from Infineon Technologies is a quasi-resonant PWM controller IC for off-line flyback SMPS, featuring integrated 500V startup cell, digital frequency reduction, active burst mode (standby <100 mW), and cycle-by-cycle current limiting. It operates from -40°C to +125°C ambient, supports VCC supply up to 25 V, and targets adapter/charger and auxiliary power supplies in LCD TVs and set-top boxes.
For engineers reviewing the ICE2QS03GXUMA1 datasheet, ICE2QS03GXUMA1 pinout, ICE2QS03GXUMA1 application, or ICE2QS03GXUMA1 equivalent, key selection criteria include ZC-based quasi-resonant switching timing, HV pin startup current capability (1.2 mA typ), FB-controlled burst ratio, CS-based peak current foldback correction, and GATE drive strength (±1 A) for external MOSFETs.
Technical Context
The ICE2QS03GXUMA1 implements a digital zero-crossing detection architecture with internal ZC counter and up/down logic to synchronize MOSFET turn-on at valley points across load conditions. Its digital frequency reduction adjusts switching frequency downward as load decreases, maintaining QR operation down to very light loads.
It integrates a constant-current 500V HV startup cell (1.2 mA typ) that pre-charges VCC independently of transformer auxiliary winding, enabling reliable start-up under low-input-voltage or high-capacitance conditions. Protection includes latch-off OVP via ZC pin, auto-restart UVLO/OVLO on VCC, open-loop detection via FB, and short-winding protection via CS overvoltage during on-time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Operating Range | 9.5 V to 25 V - ensures stable operation across wide input line variations and transformer regulation tolerances |
| HV Startup Current | 1.2 mA (typ) - enables direct connection to rectified AC bus without external resistor, reducing BOM count |
| GATE Drive Strength | ±1 A peak - directly drives medium-power MOSFETs (e.g., 650V/1Ω RDS(on)) without external buffer |
| Standby Power | <100 mW - achieved via active burst mode with controllable output ripple for Energy Star compliance |
| Operating Temperature | -40°C to +125°C - supports industrial-grade enclosure environments without derating |
| Digital ZC Detection | Internal ZC counter with time-delayed auxiliary winding input - enables precise valley-switching synchronization independent of winding parasitics |
| Foldback Correction | Adjusts current limit threshold based on VCC level - maintains consistent power delivery across input voltage range |
Pinout & Package
ICE2QS03GXUMA1 is housed in PG-DSO-8 (8-pin exposed-pad SOIC) package, RoHS-compliant with Pb-free lead plating and halogen-free mold compound. Thermal pad enhances power dissipation in compact adapter designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 ZC | Zero-Crossing Input | Accepts delayed auxiliary winding signal; triggers valley-switching and provides OVP detection via internal threshold comparison |
| 2 FB | Feedback Input | Controls PWM off-time, burst ratio, and digital frequency reduction; monitors open-loop/overload via voltage level |
| 3 CS | Current Sense Input | Inputs shunt voltage for cycle-by-cycle peak current limiting and short-winding protection during MOSFET on-time |
| 4 GATE | Gate Driver Output | Push-pull output driving external MOSFET gate; ±1 A drive strength supports fast turn-on/turn-off |
| 5 HV | High-Voltage Startup Input | Connects directly to rectified DC bus; delivers 1.2 mA constant current to charge VCC capacitor |
| 6 N.C. | No Connect | Internally unconnected; must remain floating per design - no external tie required |
| 7 VCC | Controller Supply | Power rail for internal circuitry; monitored for UVLO (9.5 V) and OVLO (27.5 V) with auto-restart behavior |
| 8 GND | Ground Reference | Common return for all analog/digital blocks; connects to thermal pad for enhanced thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 500V HV Startup Cell | Eliminates external high-voltage resistor network, reducing component count and improving start-up reliability under brown-out conditions |
| Digital Frequency Reduction | Automatically lowers switching frequency with decreasing load while preserving quasi-resonant valley switching, improving light-load efficiency by >5% vs fixed-frequency controllers |
| Active Burst Mode | Delivers <100 mW standby power with tightly controlled output ripple (<50 mVpp), meeting EU CoC Tier 2 and DOE Level VI requirements |
| Built-in Digital Soft-Start | Prevents inrush current and overshoot during power-up by gradually increasing duty cycle over ~10 ms |
| Latch-Off OVP via ZC Pin | Output overvoltage protection triggered by ZC voltage exceeding internal threshold, providing fast, isolated fault response without optocoupler dependency |
Applications
| Adapter/Charger | LCD Monitor Power Supply |
|---|---|
Use Scenario: 12–19 V, 2–3 A wall adapters for laptops and peripherals. IC Role / Device Role / Timing Role: Primary-side QR PWM controller synchronizing MOSFET turn-on to valley points using ZC signal from auxiliary winding. Use Value: Achieves >88% average efficiency across 10–100% load and <100 mW no-load consumption, satisfying global energy regulations. | Use Scenario: 12 V/5 V dual-output auxiliary supply in 24-inch LCD monitors. IC Role / Device Role / Timing Role: Controls flyback converter operating in QR mode with digital frequency scaling to maintain efficiency at 5%–20% partial load. Use Value: Enables compact board layout with integrated HV startup and eliminates need for external VCC bias winding. |
| Set-Top Box Auxiliary Supply | Home Theater Audio System PSU |
Use Scenario: 5 V/1 A standby rail powering remote IR receiver and MCU in digital cable boxes. IC Role / Device Role / Timing Role: Operates in active burst mode during standby, using FB pin to modulate burst frequency and regulate output. Use Value: Delivers stable 5 V ±3% with <30 mVpp ripple at 10 mA load, ensuring reliable low-power wake-up functionality. | Use Scenario: 24 V/0.5 A main rail and 5 V/0.2 A logic rail in multi-channel AV receivers. IC Role / Device Role / Timing Role: Implements full protection suite (OVP, UVP, SCP, OL) with latch-off and auto-restart modes for robust field operation. Use Value: Prevents catastrophic failure during speaker short-circuit events via CS-based short-winding detection and immediate shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quasi-resonant flyback controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS01GXUMA1 | Lower VCC max (20 V vs 25 V); no VVCCPD specification; same pinout and feature set | Suitable only for lower-input-voltage designs (<265 VAC nominal); lacks margin for high-line transients | Select when VCC stress remains below 20 V and cost sensitivity outweighs transient robustness |
| LD7575P | Analog-based QR controller; no digital frequency reduction; requires external HV startup resistor | Higher BOM count; less precise light-load efficiency control; no integrated burst-mode timing logic | Choose for legacy designs where analog control loop familiarity and distributor stock availability are prioritized |
Compared with ICE2QS01GXUMA1, ICE2QS03GXUMA1 offers higher VCC tolerance and improved transient immunity; versus LD7575P, it delivers superior light-load efficiency and reduced component count via integrated HV startup and digital control.
Availability
ICE2QS03GXUMA1 is available at Aetrix Electronics and suitable for adapter/charger, LCD monitor power supply, and set-top box auxiliary supply applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ICE2QS03GXUMA1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive, and industrial control ICs, with global R&D and wafer fabrication infrastructure.
The ICE2QS product line delivers highly integrated, digitally enhanced quasi-resonant controllers targeting high-efficiency, low-standby-power offline SMPS in consumer and computing power supplies.
FAQ
What is the function of the HV pin on ICE2QS03GXUMA1?
The HV pin connects directly to the rectified DC bus and powers an internal 500V-rated constant-current startup cell (1.2 mA typical). This cell pre-charges the VCC capacitor before the auxiliary winding begins supplying power, enabling reliable start-up even at low input voltages or with large VCC capacitors. It eliminates the need for an external high-voltage startup resistor.
How does the ZC pin provide output overvoltage protection?
The ZC pin receives a time-delayed signal from the transformer auxiliary winding. Internally, this voltage is compared against a fixed threshold (~3.6 V). If exceeded-indicating excessive output voltage-the controller enters latch-off mode, disabling GATE output until a full power cycle reset occurs. This provides fast, primary-side OVP without requiring optocoupler feedback.
Does ICE2QS03GXUMA1 require an external soft-start capacitor?
No. ICE2QS03GXUMA1 integrates a digital soft-start function that ramps the PWM duty cycle over approximately 10 ms after VCC reaches UVLO turn-on threshold. No external capacitor is needed-this simplifies design, improves consistency across units, and avoids temperature-dependent timing drift associated with RC networks.
Can ICE2QS03GXUMA1 operate in discontinuous conduction mode (DCM)?
Yes. The ICE2QS03GXUMA1 is designed for quasi-resonant operation in DCM flyback topologies. Its digital zero-crossing detector identifies valley points in the drain voltage waveform, allowing the controller to switch the MOSFET at minimum voltage points regardless of load, thereby minimizing switching losses and EMI across the full operating range.
ICE2QS03GXUMA1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Isolation:
- Isolated
- Internal Switch(s):
- No
- Voltage - Breakdown:
- -
- Topology:
- Flyback
- Voltage - Start Up:
- 18 V
- Voltage - Supply (Vcc/Vdd):
- 10.5V ~ 27V
- Duty Cycle:
- 50%
- Frequency - Switching:
- 52kHz
- Power (Watts):
- -
- Fault Protection:
- Current Limiting, Open Loop, Over Load, Over Temperature, Over Voltage
- Control Features:
- -
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- PG-DSO-8
- Mounting Type:
- Surface Mount
ICE2QS03GXUMA1 FAQ
1.How can I place an order for ICE2QS03GXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ICE2QS03GXUMA1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ICE2QS03GXUMA1 reliable?
The price and inventory of ICE2QS03GXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICE2QS03GXUMA1 is usually 5 days.
3.What payment methods are accepted for ICE2QS03GXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICE2QS03GXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICE2QS03GXUMA1?
ICE2QS03GXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICE2QS03GXUMA1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ICE2QS03GXUMA1?
For technical support, including ICE2QS03GXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICE2QS03GXUMA1 requirements.
6.How does Aetrix verify that ICE2QS03GXUMA1 is sourced from the original manufacturer or authorized distributors?
All ICE2QS03GXUMA1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ICE2QS03GXUMA1 meets industry standards.
7.What is the process for return or replacement of ICE2QS03GXUMA1?
All ICE2QS03GXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with ICE2QS03GXUMA1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ICE2QS03GXUMA1 part is unused and in its original packaging.
Return procedure for ICE2QS03GXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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