ICE5QSBGXUMA1 - 27W QR Flyback PWM Controller | Infineon
MPN: ICE5QSBGXUMA1 β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.45 | $1.45 |
| 10 | $1.3 | $13.00 |
| 100 | $1.12 | $112.00 |
| 500 | $0.96 | $480.00 |
| 1,000 | $0.85 | $850.00 |
ICE5QSBGXUMA1 Overview
A flyback converter is the dominant topology for low-to-medium power isolated AC/DC supplies because it provides galvanic isolation and multiple outputs with a single magnetic element. Quasi-resonant control improves on hard-switched PWM by switching the MOSFET on at the drain-source voltage valley, which reduces switching losses and EMI. The CoolSET product line from Infineon packages this QR controller plus the high-voltage power MOSFET into a single IC, eliminating the need for a separate switch and shrinking the BOM.
Key features include integrated 750 V MOSFET, quasi-resonant valley switching, built-in soft-start, frequency reduction at light load, and a comprehensive protection suite that covers over-current, over-voltage, over-temperature, overload, open-loop, and VCC under-voltage. The device is targeted at universal-input (85 V to 265 V AC) designs with > 82 percent typical efficiency, simplifying EN 62368-1 and Energy Star compliance for white goods and industrial auxiliary rails.
The ICE5QSBG uses current-mode control with cycle-by-cycle current limiting and a 65 kHz base switching frequency. Frequency foldback at low load reduces switching losses and improves light-load efficiency to meet EuP/CoC Tier 2 standby targets below 75 mW. The IC supports burst-mode operation for sub-100 mW standby, which is critical for always-on appliances.
Typical applications include 5 V to 12 V auxiliary supplies for white goods and major appliances, smart-meter and IoT gateways, bias supplies for industrial PLCs, set-top box standby rails, and small open-frame adapters for lighting controls. The PG-DSO-8 footprint with high-voltage clearance makes it suitable for through-hole or SMD layouts where PCB creepage must exceed 6 mm.
When designing with this controller, allow adequate creepage between the DSO-8 package and any low-voltage secondary traces to satisfy IEC 62368-1. The VCC hold-up capacitor value must be sized so that VCC never collapses below UVOFF during start-up under worst-case AC line conditions. Place the current-sense resistor close to the SOURCE pin to minimize parasitic inductance in the gate-drive return path.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including the parametric deltas between the ICE5QSBG and the wider CoolSET 5th-generation family to help engineers select the right IC for their topology and power level.
Drop-in alternatives for ICE5QSBGXUMA1 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 ICE5QSBGXUMA1 (same form factor and footprint) β differing in Package, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ICE5QR0680BGXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ICE5QR4780BGXUMA1
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 βICE2QR0680ZXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ICE5QSAGXUMA1
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
ICE5QSBGXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Offline Flyback, Quasi-Resonant |
| Integrated MOSFET Breakdown Voltage | 750 V |
| Maximum Output Power (universal AC) | 27 W |
| Switching Frequency (typ.) | 65 kHz base |
| Soft-Start | Built-in |
| Light-Load Operation | Burst mode / frequency foldback |
| Over-Current Protection | Cycle-by-cycle |
| Over-Voltage Protection | Yes |
| Over-Temperature Protection | Yes |
| Open-Loop Protection | Yes |
| Operating Temperature Range | -40 C to +150 C |
| Package | PG-DSO-8 (DSO-8 with high-voltage leadframe) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
ICE5QSBGXUMA1 Pin Configuration
| Pin 1 | DRAIN β Drain of integrated 750 V CoolMOS MOSFET |
| Pin 2 | GND β Ground reference for control circuitry |
| Pin 3 | VCC β Supply voltage for internal control block, decoupled externally |
| Pin 4 | FB β Feedback input from optocoupler / secondary controller |
| Pin 5 | CS β Current sense input for cycle-by-cycle OCP |
| Pin 6 | SOURCE β Source of integrated MOSFET |
| Pin 7 | NC / SOURCE β No-connect or source lead (package variant dependent) |
| Pin 8 | NC / DRAIN β No-connect or drain lead (package variant dependent) |
Typical Applications
ICE5QSBGXUMA1 is suitable for 6 applications: White Goods Auxiliary Supplies, Smart Meter / IoT Gateway Power, Industrial PLC Bias Supply, Set-Top Box / Streaming Dongle Standby, Lighting Control and LED Driver Bias, Small Open-Frame AC Adapter.
White Goods Auxiliary Supplies
The Infineon ICE5QSBGXUMA1 targets auxiliary and standby rails inside washing machines, refrigerators, and ovens, where isolated 5 V to 12 V rails power microcontrollers, displays, and sensor conditioning. Its integrated 750 V CoolMOS MOSFET and 65 kHz quasi-resonant valley switching let the flyback reach typical efficiencies above 82 percent on universal AC input, reducing thermal stress on small form-factor boards. Burst-mode operation drives standby below 75 mW, helping the appliance pass EuP and Energy Star standby budgets. The PG-DSO-8 high-voltage footprint provides the creepage needed for IEC 60335-1 household-appliance certification.
Recommended
Smart Meter / IoT Gateway Power
Smart electricity, water, and gas meters need a low-cost, isolated AC/DC rail to power their radio module and microcontroller. The ICE5QSBGXUMA1 integrates the switch, controller, and protection in one PG-DSO-8 IC, shrinking the meter power section to a footprint well under 20 mm x 20 mm. Quasi-resonant valley switching cuts conducted EMI, easing EN 55022 Class B compliance for residential metering. Frequency foldback at light load keeps idle consumption low enough for 24/7 operation without violating utility standby budgets.
Recommended
Industrial PLC Bias Supply
Industrial PLCs, HMI panels, and sensor hubs require an isolated 24 V to 5 V bias rail for housekeeping logic. The ICE5QSBGXUMA1's 750 V MOSFET withstands industrial 305 V AC brownout events and typical 3 kV surges with proper MOV clamping, making it suitable for IEC 61000-4-5 industrial environments. Cycle-by-cycle current limit plus OTP/OVP ensure the bias rail fails safely if a downstream short occurs, protecting both the PLC backplane and field wiring. The PG-DSO-8 package is suitable for wave-soldered or reflow production.
Recommended
Set-Top Box / Streaming Dongle Standby
Always-on streaming devices must maintain network connectivity while drawing minimal standby power. The ICE5QSBGXUMA1's burst-mode operation keeps standby well below 100 mW, while quasi-resonant switching ensures conducted EMI remains within FCC Class B for the always-on subsystem. The PG-DSO-8 footprint lets designers place the power IC on the same compact PCB as the Wi-Fi module without thermal concerns. Its integrated protection suite also helps pass IEC 62368-1 audio/video safety tests.
Recommended
Lighting Control and LED Driver Bias
Dimmable LED drivers and DALI lighting controllers often include a small isolated bias rail for the wireless module, touch panel, or microcontroller. The ICE5QSBGXUMA1 integrates the controller and 750 V switch, so designers need only a transformer, bridge, and snubber to deliver 5 V to 12 V at sub-3 W. Quasi-resonant operation lowers EMI enough to coexist with sensitive analog dimming circuitry on the same board. The PG-DSO-8 high-voltage package is also useful for through-hole retrofit kits.
Recommended
Small Open-Frame AC Adapter
Compact universal-input AC adapters for routers, modems, and consumer accessories use the ICE5QSBGXUMA1 in a flyback topology to deliver 5 V to 12 V at up to 27 W. The integrated 750 V CoolMOS MOSFET eliminates the need for a separate DPAK switch, reducing adapter weight and PCB area. Quasi-resonant valley switching combined with frequency foldback yields average efficiencies above 85 percent, satisfying DOE Level VI and EU CoC Tier 2 efficiency rules. The PG-DSO-8 package supports automated SMD assembly for high-volume adapter production.
Recommended
Recommended Products Summary
Engineering reference data for ICE5QSBGXUMA1 β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICE5QR0680BGXUMA1 | ICE5QR4780BGXUMA1 | ICE3RBR1765JGXUMA1 | ICE2QR0680ZXUMA1 | ICE5QSAGXUMA1 |
|---|---|---|---|---|---|---|
| Package | PG-DSO-8 | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-8 - same | PG-DSO-7 - close | PG-DSO-8 - same |
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Topology | QR Flyback | QR Flyback | QR Flyback | QR Flyback (older gen) | QR Flyback (older gen) | QR Flyback |
| Integrated MOSFET Vds | 750 V | 800 V | 800 V | 650 V | 800 V | 750 V |
| Operating Temperature Range | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C | -40 C to +150 C |
Key Differentiators
- 5th-generation QR controller IP with lowest standby in its class (vs ICE3RBR1765JGXUMA1)
- Integrated 750 V CoolMOS in PG-DSO-8 high-voltage package (vs ICE5QR0680BGXUMA1)
- Optimized for sub-30 W auxiliary rails with valley switching (vs ICE5QR4780BGXUMA1)
Design Notes
Estimated: at universal AC input, 27 W output, and 80 percent efficiency, the flyback dissipates about 6.75 W total, of which roughly 60 percent lands in the integrated CoolMOS. The PG-DSO-8 theta_JA is approximately 80 C/W on a 1 oz 4-layer 600 mm^2 copper pour, yielding a junction temperature rise of about 320 C at 6.75 W. Therefore the effective dissipation must stay below 1.5 W or be reduced by a top-side copper pour to maintain TJ under 125 C in sealed enclosures.
Maintain at least 6 mm of creepage between the DRAIN lead of the PG-DSO-8 footprint and any low-voltage secondary traces to satisfy IEC 62368-1 and IEC 60335-1 safety requirements. Place the CS current-sense resistor within 3 mm of the SOURCE/CS pins to minimize parasitic inductance that can cause false triggering of the cycle-by-cycle current limit. Route the VCC hold-up capacitor return directly to the GND pin without sharing copper with the power loop.
Keep the primary-side switching loop (DRAIN - transformer primary - integrated MOSFET source - CS sense resistor) as small and physically tight as possible to minimize radiated EMI. The auxiliary winding loop (transformer auxiliary - diode - VCC capacitor - GND) should be similarly compact. Quasi-resonant valley switching helps EMI, but only if the snubber around the primary is sized correctly; a too-large snubber defeats the valley-switching efficiency gain.
Common pitfalls with the ICE5QSBGXUMA1 include undersized VCC hold-up capacitor causing startup failure at low line, omitting the gate resistor (built-in for CoolSET but verify R-C snubber is correct), and choosing a transformer with too high magnetizing inductance which prevents clean valley switching. Ensure the feedback optocoupler CTR is between 50 and 200 percent at the nominal bias, otherwise the dynamic response of the flyback will be degraded and OCP will mis-trigger.
Compliance Information
RoHS compliant per Infineon product page. Operating temperature -40 C to +150 C is suitable for white-goods and industrial applications but not AEC-Q100 automotive. Designers should validate IEC 62368-1 / IEC 60335-1 compliance with the PG-DSO-8 high-voltage leadframe.
