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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > AC DC Converters, Offline Switches

Infineon Technologies ICE2QR4780ZXKLA1

Name: ICE2QR4780ZXKLA1
Brand: Infineon Technologies
SKU: ICE2QR4780ZXKLA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ICE2QR4780ZXKLA1

Manufacturer:: Infineon Technologies

Category:: AC DC Converters, Offline Switches

Package:: 8-DIP (0.300", 7.62mm), 7 Leads

Datasheet:: ICE2QR4780ZXKLA1.pdf

Description:: IC OFFLINE SWITCH FLYBACK 7DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ICE2QR4780ZXKLA1 from Infineon Technologies is a quasi-resonant AC-DC PWM controller IC with integrated 800V CoolMOS® and startup cell in PG-DIP-7 package, designed for off-line SMPS in LCD monitors, DVD/Blu-ray players, and set-top boxes. It delivers 39W at 230VAC ±15%, features active burst mode (<100mW no-load standby), digital frequency reduction, and built-in foldback current limiting.

For engineers reviewing the ICE2QR4780ZXKLA1 datasheet, ICE2QR4780ZXKLA1 pinout, ICE2QR4780ZXKLA1 application, or ICE2QR4780ZXKLA1 equivalent, key selection criteria include integrated high-voltage startup capability, zero-crossing–based quasi-resonant switching timing, VCC undervoltage/overvoltage auto-restart protection, and digital soft-start with 12ms ramp profile.

Technical Context

The ICE2QR4780ZXKLA1 implements peak-current-mode control with digital zero-crossing detection to enable valley-switching of the internal 800V CoolMOS®, reducing EMI and voltage stress on secondary rectifiers. Its up/down counter dynamically adjusts switching frequency based on feedback voltage (VFB) across four 48ms intervals, enabling quasi-resonant operation down to very light loads.

It integrates a high-voltage startup cell that pre-charges VCC via a controlled ~1.05mA current until VVCCon (≈14.5V) is reached, then disables itself. Protection logic includes cycle-by-cycle current limiting, foldback point correction, and latch-off for adjustable output overvoltage and transformer short-winding detection.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS Rating	800V - Enables direct connection to universal AC input (85–265VAC) without external HV startup network.
R_DS(on)	4.7Ω @ T=25°C - Defines conduction loss in primary switch; optimized for 39W continuous output at 230VAC.
Max Output Power	39W @ 230VAC ±15%, T_a=50°C - Measured with 232mm², 2oz copper on Drain pin as heatsink.
Standby Power	<100mW @ no load - Achieved via Active Burst Mode with controllable output ripple and low-frequency gating.
Soft-Start Time	12ms (4-step digital ramp) - Limits inrush current and reduces stress on transformer, MOSFET, and output diodes.
VCC Operating Range	10.5V to 25V - Supports wide auxiliary winding design margin and stable operation under line/load transients.
Zero-Crossing Detection	Digital ZC counter with ringing suppression - Ensures reliable valley-switching even during low-output or short-circuit conditions.

Pinout & Package

Package: PG-DIP-7 (Plastic Dual-In-Line Package, 7-pin, wide-body, creepage-optimized for 800V isolation).

Pin/Terminal	Circuit Role	Design Meaning
1 (ZC)	Zero-Crossing Input	Accepts delayed auxiliary winding signal; triggers valley-switching and enables output overvoltage detection via internal threshold comparison.
2 (FB)	Feedback Input	Carries optocoupler-derived regulation signal; controls PWM off-time, digital frequency reduction, and Active Burst Mode entry/exit.
3 (CS)	Current Sense Input	Monitors primary-side shunt resistor voltage; enables cycle-by-cycle peak current limiting and short-winding protection during on-time.
4 (N.C.)	No Connect	Internally unconnected; must remain floating - no external tie or pull-up/pull-down.
5 (Drain)	CoolMOS® Drain Terminal	High-side power switch node; connects directly to bulk capacitor (C_bus) and primary transformer winding.
7 (VCC)	Controller Supply	Power rail for internal logic and gate driver; supplied by startup cell initially, then auxiliary winding; protected by UVLO/OVP auto-restart.
8 (GND)	Controller Ground	Reference for all analog sensing (CS, FB, ZC) and digital logic; must be low-inductance path to power ground plane.

Key Features

Feature	Design Value
Integrated 800V CoolMOS® + Startup Cell	Eliminates external HV startup resistor network and discrete MOSFET, reducing BOM count and board space by ≥3 components.
Active Burst Mode	Reduces average switching frequency at light/no load while maintaining tight output regulation and <100mW input power.
Digital Frequency Reduction	Adjusts switching frequency in discrete steps per 48ms interval based on VFB, improving efficiency across 10–100% load range.
Built-in Digital Soft-Start	12ms, 4-step ramp of CS threshold (0.32V → 1.00V) prevents transformer saturation and limits inrush current at power-on.
Auto-Restart Protections	VCC UVLO/OVP, overload, and overtemperature faults trigger safe shutdown with automatic recovery - no manual reset required.

Applications

LCD Monitor Power Supply

DVD/Blu-ray Player SMPS

Use Scenario: 24W–36W open-frame AC-DC adapter powering main logic board and backlight inverter.

IC Role / Device Role / Timing Role: Primary-side quasi-resonant controller managing CoolMOS® switching, feedback regulation, and valley detection via ZC pin.

Use Value: Enables >85% efficiency at full load and <100mW no-load consumption, meeting Energy Star 6.0 and EU CoC Tier 2 requirements.

Use Scenario: Compact 18W–25W flyback supply for optical drive, servo control, and digital audio subsystems.

IC Role / Device Role / Timing Role: Integrated PWM controller with digital soft-start and burst mode ensures reliable cold-start and low standby leakage.

Use Value: Reduces audible transformer whine via quasi-resonant valley switching and eliminates need for external X-cap discharge circuitry.

Set-Top Box Adapter

Small Form-Factor TV Auxiliary Supply

Use Scenario: 12V/2A isolated flyback supplying SoC, memory, and HDMI interface in cable/satellite receivers.

IC Role / Device Role / Timing Role: Feedback-regulated current-mode controller with foldback current limiting and ZC-synchronized turn-on.

Use Value: Maintains stable output under dynamic load steps (e.g., channel change, recording start) without output overshoot or dropout.

Use Scenario: 5V/1A auxiliary rail for remote control receiver, IR sensor, and real-time clock in smart TVs.

IC Role / Device Role / Timing Role: Low-power standby-optimized controller using Active Burst Mode and digital frequency scaling.

Use Value: Achieves <75mW no-load consumption while sustaining fast wake-up response (<500ms) from deep sleep state.

Equivalent & Alternatives

The following parts are listed as comparable options for similar quasi-resonant AC-DC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE2QR4765Z	Same CoolSET®-Q1 platform, but 650V CoolMOS® (R_DS(on) = 4.7Ω), lower max input voltage rating (≤265VAC derated).	Suitable only for 100–240VAC nominal inputs; not rated for 230VAC ±15% surge conditions.	Select when cost sensitivity outweighs universal input robustness and peak power demand is ≤25W.
ICE3B0565J	Fixed-frequency PWM controller (no QR), 650V MOSFET, no integrated startup cell - requires external HV resistor network.	Lacks valley-switching, higher EMI, and higher standby power (>250mW); needs additional components for VCC startup.	Choose only for legacy designs where QR complexity is undesirable and EMI filtering budget allows.

Compared with ICE2QR4765Z and ICE3B0565J, ICE2QR4780ZXKLA1 uniquely combines 800V ruggedness, integrated startup, and digital QR control - delivering superior surge immunity, lowest BOM count, and best-in-class no-load efficiency for universal-input consumer SMPS.

Availability

ICE2QR4780ZXKLA1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, Blu-ray player SMPS, and set-top box adapters requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.

Supply support for ICE2QR4780ZXKLA1 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 CoolSET®-Q1 product line was engineered specifically for cost-sensitive, high-efficiency off-line SMPS in consumer electronics - integrating HV power switches, controllers, and protection logic into single-package solutions.

FAQ

What is the purpose of the N.C. (Pin 4) on ICE2QR4780ZXKLA1?

Pin 4 is internally unconnected and must remain electrically floating - no external connection, pull-up, or pull-down is permitted. This pin exists for mechanical symmetry and creepage compliance in the PG-DIP-7 package; routing traces or vias to it violates isolation requirements and may cause field failure.

How does the integrated startup cell eliminate the need for an external HV resistor?

The startup cell embeds a high-voltage lateral device and control logic inside the CoolMOS® die. At power-on, it delivers ~1.05mA to charge the VCC capacitor until VVCCon (≈14.5V) is reached, then shuts off - removing the need for a discrete 1–2MΩ, 1W resistor that would otherwise dissipate heat and occupy PCB area.

Can ICE2QR4780ZXKLA1 operate in discontinuous conduction mode (DCM) only?

Yes - its quasi-resonant architecture is designed exclusively for DCM operation. The ZC pin detects transformer demagnetization via auxiliary winding voltage zero-crossing, ensuring the CoolMOS® turns on only at drain voltage valleys. It does not support CCM or forced CCM modes.

What is the maximum allowable VCC voltage before OVP latch-off activates?

VCC overvoltage protection triggers at V_VCCOVP = 27.5V (typical), initiating auto-restart mode - not latch-off. Latch-off occurs only for output overvoltage (via FB/ZC monitoring) or transformer short-winding (via CS pin overvoltage during on-time). VCC OVP recovery is automatic after voltage drops below V_VCCoff ≈ 9.5V.

ICE2QR4780ZXKLA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: CoolMOS™, CoolSET™-Q1

Package/Case:: 8-DIP (0.300", 7.62mm), 7 Leads

Packaging:: Tube

Product Status:: Obsolete

Output Isolation:: Isolated

Internal Switch(s):: Yes

Voltage - Breakdown:: 800V

Topology:: Flyback

Voltage - Start Up:: 18 V

Voltage - Supply (Vcc/Vdd):: 10.5V ~ 27V

Duty Cycle:: 50%

Frequency - Switching:: 52kHz

Power (Watts):: 39 W

Fault Protection:: Current Limiting, Over Load, Over Temperature, Over Voltage

Control Features:: -

Operating Temperature:: -40°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Supplier Device Package:: PG-DIP-7-1

Mounting Type:: Through Hole

ICE2QR4780ZXKLA1 FAQ

1.How can I place an order for ICE2QR4780ZXKLA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for ICE2QR4780ZXKLA1 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 ICE2QR4780ZXKLA1 reliable?

The price and inventory of ICE2QR4780ZXKLA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICE2QR4780ZXKLA1 is usually 5 days.

3.What payment methods are accepted for ICE2QR4780ZXKLA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICE2QR4780ZXKLA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ICE2QR4780ZXKLA1?

ICE2QR4780ZXKLA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ICE2QR4780ZXKLA1 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 ICE2QR4780ZXKLA1?

For technical support, including ICE2QR4780ZXKLA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICE2QR4780ZXKLA1 requirements.

6.How does Aetrix verify that ICE2QR4780ZXKLA1 is sourced from the original manufacturer or authorized distributors?

All ICE2QR4780ZXKLA1 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 ICE2QR4780ZXKLA1 meets industry standards.

7.What is the process for return or replacement of ICE2QR4780ZXKLA1?

All ICE2QR4780ZXKLA1 units undergo pre-shipment inspection (PSI). If there is an issue with ICE2QR4780ZXKLA1, 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 ICE2QR4780ZXKLA1 part is unused and in its original packaging.

Return procedure for ICE2QR4780ZXKLA1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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