ICE5ASAGXUMA1 - 5th Gen Fixed Frequency Flyback PWM Controller | Infineon
MPN: ICE5ASAGXUMA1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.41 | $141.00 |
| 500 | $1.18 | $590.00 |
| 1,000 | $0.97 | $970.00 |
ICE5ASAGXUMA1 Overview
What is an offline flyback PWM controller with integrated MOSFET? It is a power-supply controller that regulates energy transfer in a flyback (isolated buck-boost) topology by switching the primary of a coupled inductor at fixed frequency, where the controller and high-voltage switch are monolithically combined in a single SO-8/DPAK-style package. In the broader taxonomy, it is a sub-class of switched-mode power supply (SMPS) controllers, which sit under power management ICs and serve as the core of isolated AC-DC converters used in adapters, open-frame power supplies and auxiliary supplies.
Key features of the ICE5ASAGXUMA1 include 100 kHz maximum switching frequency, 700V integrated MOSFET breakdown voltage, 9.4V to 27V VCC operating range (with brown-in protection), and comprehensive protection suite: overload, over-temperature, VCC over/under-voltage, open-loop, and output over-voltage protection. The 3-level selectable entry/exit threshold lets designers trade standby power against immunity to mains dips.
Technically, the device uses current-mode control with a precise internal reference, supporting both quasi-resonant-like valley skipping and fixed-frequency operation. The integrated cascode startup stage eliminates the external startup resistor network, shrinking the BOM and improving no-load consumption.
Typical applications include low-power AC-DC adapters (5W-15W), auxiliary supplies for white goods and industrial equipment, standby SMPS for set-top boxes, and isolated LED drivers.
When designing with this part, ensure that the VCC capacitor value is sized per the Infineon demoboard reference and that the CS pin current-sense resistor handles peak primary current with adequate margin.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found on the manufacturer single-page summary.
Drop-in alternatives for ICE5ASAGXUMA1 — 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 ICE5ASAGXUMA1 (same form factor and footprint) — differing in Package, Topology, Control Mode, Operating Temperature, Protection Features.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ICE5ASAGXUMA1
✅ Drop-In✓ In Stock
$0.97 / Unit
View Datasheet →ICE5GRXUMA1
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ICE5ARXUMA1
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
ICE3RBR1765JGXUMA1
✅ Drop-In✓ In Stock
$0.92 / Unit
View Datasheet →ICE2HS01GXUMA1
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.85 / Unit
View Datasheet →ICE5ASAGXUMA1 Maximum Ratings & Electrical Characteristics
| Topology | Offline Flyback (isolated) |
| Switching Frequency (max) | 100 kHz |
| Switching Frequency Control | Fixed frequency |
| Integrated Power Switch | 700 V MOSFET (cascode) |
| VCC Supply Range | 9.4 V to 27 V |
| Brown-In Protection | Yes (3-level selectable) |
| Internal Supply Output | 10 V / 20 mA |
| Startup Configuration | Cascode (integrated, no external startup resistor) |
| Control Mode | Current-mode PWM |
| Package | PG-DSO-8 (DPAK-style, 8-pin) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 C to +125 C (junction) |
| Protection Features | OLP, OVP, OTP, VCC OV/UV, Open Loop, brown-out |
| MSL Level | MSL3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
ICE5ASAGXUMA1 Pin Configuration
| Pin 1 | VCC — Supply voltage for the control IC (9.4V-27V operating range) |
| Pin 2 | FB — Feedback input for optocoupler / primary-side regulation |
| Pin 3 | CS — Current sense input - connect to primary-side sense resistor |
| Pin 4 | GND — Ground reference for the control IC |
| Pin 5 | DRAIN — Drain of integrated 700V power MOSFET |
| Pin 6 | DRAIN — Drain of integrated 700V power MOSFET (electrically tied to pin 5) |
| Pin 7 | DRAIN — Drain of integrated 700V power MOSFET (electrically tied to pin 5) |
| Pin 8 | DRAIN — Drain of integrated 700V power MOSFET (electrically tied to pin 5) |
Typical Applications
ICE5ASAGXUMA1 is suitable for 6 applications: Low-Power AC-DC Adapter (5W-15W), Auxiliary Supply for White Goods, Standby SMPS for Set-Top Boxes, Isolated LED Driver (up to 15W), Industrial Auxiliary / Metering Supply, Replacement of Legacy CoolSET 3rd-Gen Designs.
Low-Power AC-DC Adapter (5W-15W)
The ICE5ASAGXUMA1 is a strong fit for low-power AC-DC adapters in the 5W to 15W range because its integrated 700V cascode MOSFET eliminates the external startup resistor, shrinking the BOM and reducing standby power to under 75 mW. Its fixed 100 kHz switching produces a deterministic EMI signature that simplifies input-filter design against CISPR 22 Class B. The 3-level brown-in selection lets the designer trade standby consumption against mains-noise immunity depending on the target region (EU vs. US/Japan). At VIN = 115 VAC and full load, the part sustains efficiency around 80% with a discrete Schottky secondary, making it ideal for phone chargers, appliance bricks, and small open-frame modules.
Recommended
Auxiliary Supply for White Goods
In white goods (washing machines, refrigerators, induction cooktops) the ICE5ASAGXUMA1 serves as an isolated auxiliary SMPS that powers microcontrollers, gate drivers and displays from the universal mains. Its 700V MOSFET breakdown handles 85 to 265 VAC universal input without additional surge clamping, and the on-chip OTP and VCC OV/UV protections are critical for environments with elevated ambient temperatures. The fixed-frequency operation keeps the EMI input filter small enough to fit on a single-side PCB inside tight appliance enclosures. Compared to a 3rd-gen CoolSET like the ICE3RBR1765JGXUMA1, the 5th-gen part offers lower standby consumption and faster startup.
Recommended
Standby SMPS for Set-Top Boxes
Set-top boxes and audio amplifiers require a low-cost, ultra-low standby SMPS for the always-on rail, and the ICE5ASAGXUMA1 is purpose-built for that role. The integrated cascode startup eliminates the high-impedance startup resistor, so no-load input power can stay below 75 mW (ErP Lot 6 compliant). The FB pin supports both optocoupler feedback for tight regulation and primary-side regulation for cost-down designs. A 5V/1A secondary rail is straightforward using a single Schottky diode. The fixed 100 kHz oscillator keeps EMI consistent across load steps, which is important when the downstream SoC enters and exits sleep.
Recommended
Isolated LED Driver (up to 15W)
For isolated LED drivers in the 5W to 15W range (such as GU10, MR16 replacements, and T8/T5 ballasts), the ICE5ASAGXUMA1 provides a fixed-frequency flyback topology that drives a constant-current secondary. Its 3-level brown-in protection prevents visible flicker under brown-out conditions, and the OVP latch protects the LED string in case of an open-loop event. Compared to a buck-based LED driver, the flyback solution offers galvanic isolation that simplifies safety certification for mains-connected luminaires. Designers typically pair it with a TL431-based secondary constant-current reference.
Recommended
Industrial Auxiliary / Metering Supply
Industrial metering and PLC systems often need an isolated 5V/12V auxiliary supply from 24V DC or universal mains, and the ICE5ASAGXUMA1's wide VCC tolerance and robust protection suite make it well suited to such environments. The integrated OTP and OVP features handle the elevated ambient temperatures and inductive transients common on factory floors. Its fixed-frequency operation allows designers to align the switching harmonics with other fixed-frequency converters on the board, simplifying overall EMI compliance. The PG-DSO-8 footprint is also a common footprint for many 24V industrial auxiliary designs, allowing direct retrofit.
Recommended
Replacement of Legacy CoolSET 3rd-Gen Designs
Designers maintaining 3rd-generation CoolSET-based products (e.g., ICE3RBR1765JGXUMA1) can drop in the ICE5ASAGXUMA1 to gain faster startup, lower standby power, and integrated 3-level brown-in protection. The PG-DSO-8 pinout is preserved across CoolSET 3rd and 5th generations, so PCB layout reuse is usually possible. The 5th-gen controller also reduces startup time from ~500 ms to ~200 ms, improving user experience for plug-in adapters. Re-validation of the CS-pin sense resistor value and FB-loop compensation is required because internal thresholds have shifted.
Recommended
Recommended Products Summary
Engineering reference data for ICE5ASAGXUMA1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICE5GRXUMA1 | ICE5ARXUMA1 | ICE3RBR1765JGXUMA1 | ICE2HS01GXUMA1 |
|---|---|---|---|---|---|
| Brand | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies | Infineon Technologies |
| Package | PG-DSO-8 | PG-DSO-8 (same) | PG-DSO-8 (same) | PG-DSO-8 (same) | PG-DSO-8 (same) |
| Generation | CoolSET 5th gen | CoolSET 5th gen | CoolSET 5th gen | CoolSET 3rd gen | CoolSET 2nd gen (HS) |
| Switching Mode | Fixed frequency | Fixed frequency | Quasi-resonant (valley switching) | Fixed frequency | Half-bridge resonant |
| Integrated MOSFET Breakdown | 700 V | 700 V | 700 V | 650 V | 500 V (half-bridge driver, not integrated FET) |
| Startup Configuration | Integrated cascode (no ext. resistor) | Integrated cascode | Integrated cascode | External startup resistor required | External startup resistor required |
| VCC Range | 9.4 V to 27 V | 9.4 V to 27 V | 9.4 V to 27 V | 8.5 V to 21 V | 10.5 V to 22.5 V |
Key Differentiators
- Integrated cascode startup - no external high-voltage resistor (vs ICE3RBR1765JGXUMA1)
- 3-level selectable brown-in threshold (vs ICE2HS01GXUMA1)
- Fixed-frequency simplicity vs. quasi-resonant complexity (vs ICE5ARXUMA1)
- Higher switching frequency than 3rd-gen parts (vs ICE3RBR1765JGXUMA1)
Design Notes
The PG-DSO-8 package exposes the drain pad on its underside, providing a low thermal resistance path when soldered to a copper drain plane. Estimated: at full-load dissipation of ~1.0 W (85 VAC input, 12 V/0.8 A output), with 35 C/W junction-to-ambient on a 1 sq-in copper pour, junction temperature rises approximately 35 C above ambient. Provide at least 1 sq-in of drain copper on the top layer and use thermal vias to a bottom-layer copper pour to keep Tj below 125 C. Without a copper pour, the device will exceed thermal limits at universal-mains full load.
Place the VCC decoupling capacitor (typically 10 uF) and the CS-pin filter network as close as physically possible to pins 1 and 3. The DRAIN copper pour should not extend under the control-side pins (1-4) to avoid injecting switching noise into the feedback path. Maintain at least 2 mm creepage between the drain copper and low-voltage traces to meet IEC 60950 reinforced-insulation requirements. A grounded guard ring around the FB trace further improves noise immunity.
Estimated: do not exceed the 27 V VCC maximum - excessive VCC will trigger OV protection and latch the controller. Choose a VCC auxiliary winding turn ratio so that VCC stabilizes around 15 V at full load for margin against transients. Also, do not omit the CS-pin RC filter (typically 1 kohm + 470 pF); without it, leading-edge spikes can false-trigger the OCP comparator. Finally, when migrating from the ICE3RBR1765JGXUMA1, re-validate the sense resistor value because the OCP threshold changed between CoolSET 3rd and 5th generations.
Fixed 100 kHz operation produces predictable EMI harmonics that simplify input-filter design against CISPR 22 Class B. Add a common-mode choke (typically 10 to 33 mH) plus an X-capacitor (100 to 470 nF) on the AC inlet. For Y-capacitors, keep values under 2.2 nF to limit touch current below 250 uA. Synchronize the switching frequency across multiple stages on the same board to avoid inter-modulation tones in the conducted-emissions spectrum.
Compliance Information
RoHS and REACH compliant per Infineon product page. Not AEC-Q100 qualified - this part is not intended for automotive applications. For automotive offline SMPS, consider Infineon's automotive-qualified CoolSET variants.
