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Infineon Technologies ICE3AS03LJGXUMA1
- Part No.:
- ICE3AS03LJGXUMA1
- Manufacturer:
- Infineon Technologies
- Category:
- AC DC Converters, Offline Switches
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICE3AS03LJGXUMA1.pdf
- Description:
- IC OFFLINE SWITCH FLYBACK 8DSO
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
ICE3AS03LJGXUMA1 from Infineon Technologies is an off-line current-mode PWM controller IC with integrated 500V high-voltage startup cell, fixed 100kHz switching frequency, active burst mode for <100mW standby power, and dual protection modes (latched-off and auto-restart). It targets low-to-medium-power SMPS in DVD/Blu-ray players, set-top boxes, notebook adapters, and chargers.
For engineers reviewing the ICE3AS03LJGXUMA1 datasheet, ICE3AS03LJGXUMA1 pinout, ICE3AS03LJGXUMA1 application, or ICE3AS03LJGXUMA1 equivalent, key selection criteria include its BiCMOS-based 10.5–25V VCC operating range, ±5% peak current limit tolerance, extendable blanking window via BL pin, and HV pin direct connection to bulk capacitor eliminating external startup resistors.
Technical Context
The ICE3AS03LJGXUMA1 implements a current-mode control architecture with propagation delay compensation for accurate output power limiting across wide input voltage ranges (85–265VAC), and integrates a dedicated high-voltage startup cell that switches off once VCC exceeds 18V. Its oscillator delivers a tightly regulated 100kHz internal frequency with built-in jitter to reduce EMI peaks.
Protection logic separates fault responses into latched-off mode (for overtemperature >130°C, VCC overvoltage, short winding) and auto-restart mode (for overload, open-loop, VCC undervoltage <6.23V, short optocoupler). The BL pin serves dual roles: extending blanking time via external capacitor and enabling external latch-off by pulling below 0.33V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 100kHz - ensures predictable EMI profile and simplifies filter design without external timing components. |
| Startup Voltage Range | 500V HV pin - enables direct connection to rectified bulk capacitor, eliminating external high-voltage startup resistor and reducing no-load losses. |
| VCC Operating Range | 10.5V to 25V - wide supply range supports diverse auxiliary winding designs and improves system robustness under transient conditions. |
| Peak Current Limit Tolerance | ±5% - tight current-sense accuracy enables precise output power regulation and consistent overcurrent protection across temperature and process variation. |
| Standby Power | <100mW at 265VAC no load - achieved via active burst mode with secondary-side optocoupler control, meeting stringent energy efficiency standards. |
| Blanking Time | 25µs spike blanking + 20ms base blanking - suppresses MOSFET turn-on noise and disables overload detection during high-load transients to prevent false triggering. |
| Duty Cycle Limit | 75% max - constrains maximum on-time to maintain stability in discontinuous conduction mode and prevent transformer saturation. |
Pinout & Package
ICE3AS03LJGXUMA1 is housed in PG-DSO-8 package (RoHS-compliant, lead-free plating), featuring exposed thermal pad for enhanced thermal dissipation in compact SMPS layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - BL | Extended blanking & external latch enable | Connect external capacitor to ground to extend 20ms blanking window; pull <0.33V to force immediate latch-off for system-level safety override. |
| 2 - FB | Feedback input | Primary interface for optocoupler-based voltage regulation; sole control signal during active burst mode at light/no load. |
| 3 - CS | Current sense input | Monitors MOSFET source voltage via sense resistor; triggers immediate gate shutdown when internal 1.23V threshold is exceeded. |
| 4 - Gate | Gate driver output | Push-pull CMOS driver capable of sinking/sourcing ≥1A peak; features soft gate driving to reduce EMI and dV/dt stress. |
| 5 - HV | High-voltage startup input | Directly connects to bulk capacitor (up to 500V); integrated startup cell powers VCC until UVLO threshold (18V) is reached, then disables. |
| 6 - n.c. | No connect | Internally unconnected; must remain floating - no external connection permitted. |
| 7 - VCC | Controller supply | Power rail for internal circuitry; operates from 10.5V to 25V; includes undervoltage lockout (6.23V turn-off) and overvoltage protection (25.5V clamp). |
| 8 - GND | Signal and power ground | Common reference for all analog and digital blocks; requires low-inductance layout to ensure stable current sensing and feedback accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Active Burst Mode | Enables full optocoupler-controlled regulation at no load while reducing switching activity to minimize standby losses below 100mW. |
| BiCMOS Process Technology | Reduces quiescent current and extends VCC operating range to 25V, improving compatibility with diverse auxiliary winding configurations. |
| Frequency Jittering | Modulates switching frequency around 100kHz center to spread EMI energy across spectrum, easing compliance with CISPR-22 Class B limits. |
| Propagation Delay Compensation | Adjusts current-sense threshold dynamically to cancel MOSFET and PCB trace delays, ensuring consistent output power limit across line/load conditions. |
| Integrated Soft Start | 10ms internal ramp prevents inrush current stress on power MOSFET and output rectifier during initial power-up. |
Applications
| DVD/Blu-ray Player Power Supply | Set-Top Box SMPS |
|---|---|
Use Scenario: Primary-side regulated flyback converter powering digital video processing, servo motors, and laser diodes in consumer optical disc players. IC Role / Device Role / Timing Role: Current-mode PWM controller managing gate drive, overcurrent protection, and burst-mode transitions based on secondary-side feedback. Use Value: Active burst mode maintains <100mW standby consumption while preserving fast load-jump response for motor startup and laser activation. | Use Scenario: Compact, cost-sensitive off-line SMPS delivering 3.3V, 5V, and 12V rails to demodulator, processor, and HDMI interface in digital broadcast receivers. IC Role / Device Role / Timing Role: Integrated HV startup and dual-protection controller enabling single-stage design without external startup network or discrete protection ICs. Use Value: Elimination of external startup resistor reduces BOM count and improves efficiency at light loads where STB spends >90% of operational time. |
| Notebook Adapter AC-DC Stage | USB-C Charger Auxiliary Supply |
Use Scenario: Universal-input (90–264VAC), 45W flyback converter supplying isolated 19V output to laptop mainboard with dynamic load profiles. IC Role / Device Role / Timing Role: Primary-side controller implementing precise current limiting (±5%), soft-start, and thermal shutdown to meet UL62368-1 safety requirements. Use Value: Built-in 130°C thermal shutdown and latch-off mode prevent sustained fault operation, enhancing reliability during prolonged high-ambient use. | Use Scenario: Auxiliary 5V/1A SMPS inside multi-port USB-C PD charger providing power to microcontroller, display, and communication ICs. IC Role / Device Role / Timing Role: Low-noise, low-standby controller supporting burst-mode operation synchronized with main PD controller's sleep cycles. Use Value: Frequency jitter and soft gate drive reduce conducted EMI coupling into sensitive USB-C data lines, maintaining USB-IF compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar off-line current-mode PWM controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ICE2QS03G | Lacks integrated 500V HV startup cell; requires external high-voltage resistor network; no active burst mode; fixed 65kHz frequency. | Suitable only for lower-efficiency, cost-optimized designs where standby power >200mW is acceptable and auxiliary winding provides reliable VCC. | Select when BOM cost is prioritized over efficiency and no-load performance is non-critical. |
| UC3845BD1R2G | Requires external startup circuit; no integrated blanking extension or frequency jitter; 1A gate drive; ±10% current limit tolerance. | Better suited for industrial DC-DC converters with stable input; lacks auto-restart/latch-off dual protection and HV integration for universal AC input. | Choose for ruggedized 24V/48V offline systems where Infineon's protection architecture is unnecessary. |
Compared with ICE2QS03G and UC3845BD1R2G, ICE3AS03LJGXUMA1 delivers superior light-load efficiency via active burst mode, eliminates startup component count with 500V HV pin, and provides tighter current limit accuracy and dual-protection flexibility-critical for consumer-grade universal-input adapters.
Availability
ICE3AS03LJGXUMA1 is available at Aetrix Electronics and suitable for DVD/Blu-ray players, set-top boxes, and notebook adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for ICE3AS03LJGXUMA1 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 manufacturing infrastructure.
The F3 series - including ICE3AS03LJGXUMA1 - was designed specifically for high-efficiency, low-standby-power off-line SMPS in consumer electronics, emphasizing integrated protection, EMI reduction, and simplified board layout.
FAQ
What is the purpose of the BL pin on ICE3AS03LJGXUMA1?
The BL pin serves two distinct functions: first, it accepts an external capacitor to extend the internal 20ms blanking window for improved high-load-jump immunity; second, it acts as an external latch-off enable - pulling it below 0.33V forces immediate device shutdown independent of other protection triggers. Both functions are electrically isolated within the pin structure and do not interfere with each other.
Does ICE3AS03LJGXUMA1 require an external startup resistor?
No. ICE3AS03LJGXUMA1 integrates a 500V-rated startup cell connected to the HV pin, allowing direct attachment to the bulk capacitor. Once VCC reaches 18V, the startup cell automatically disables, eliminating the need for external high-voltage resistors and associated power loss - a key enabler of sub-100mW standby performance.
How does active burst mode differ from traditional burst mode in ICE3AS03LJGXUMA1?
Unlike conventional burst modes that disable regulation entirely, ICE3AS03LJGXUMA1's active burst mode maintains full optocoupler-based feedback control during burst intervals. This preserves output voltage accuracy and enables rapid response to load steps while minimizing switching losses - achieving <100mW standby without sacrificing transient performance or output ripple.
Can ICE3AS03LJGXUMA1 be used in continuous conduction mode (CCM) flyback designs?
Yes. While optimized for discontinuous conduction mode (DCM) in low-to-medium power applications, ICE3AS03LJGXUMA1 supports CCM operation via its current-mode architecture and propagation delay compensation. Designers must verify slope compensation is applied externally if required by transformer design, and confirm maximum duty cycle (75%) accommodates CCM timing constraints at minimum input voltage.
ICE3AS03LJGXUMA1 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 ~ 25V
- Duty Cycle:
- 75%
- Frequency - Switching:
- 100kHz
- Power (Watts):
- -
- Fault Protection:
- Current Limiting, Open Loop, Over Load, Over Temperature, Over Voltage
- Control Features:
- -
- Operating Temperature:
- -25°C ~ 130°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- PG-DSO-8
- Mounting Type:
- Surface Mount
ICE3AS03LJGXUMA1 FAQ
1.How can I place an order for ICE3AS03LJGXUMA1 through Aetrix?
Please submit a Request for Quotation (RFQ) for ICE3AS03LJGXUMA1 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 ICE3AS03LJGXUMA1 reliable?
The price and inventory of ICE3AS03LJGXUMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICE3AS03LJGXUMA1 is usually 5 days.
3.What payment methods are accepted for ICE3AS03LJGXUMA1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICE3AS03LJGXUMA1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICE3AS03LJGXUMA1?
ICE3AS03LJGXUMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICE3AS03LJGXUMA1 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 ICE3AS03LJGXUMA1?
For technical support, including ICE3AS03LJGXUMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICE3AS03LJGXUMA1 requirements.
6.How does Aetrix verify that ICE3AS03LJGXUMA1 is sourced from the original manufacturer or authorized distributors?
All ICE3AS03LJGXUMA1 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 ICE3AS03LJGXUMA1 meets industry standards.
7.What is the process for return or replacement of ICE3AS03LJGXUMA1?
All ICE3AS03LJGXUMA1 units undergo pre-shipment inspection (PSI). If there is an issue with ICE3AS03LJGXUMA1, 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 ICE3AS03LJGXUMA1 part is unused and in its original packaging.
Return procedure for ICE3AS03LJGXUMA1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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