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

Infineon Technologies ICE2QR1765XKLA1

Name: ICE2QR1765XKLA1
Brand: Infineon Technologies
SKU: ICE2QR1765XKLA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ICE2QR1765XKLA1

Manufacturer:: Infineon Technologies

Category:: AC DC Converters, Offline Switches

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

Datasheet:: ICE2QR1765XKLA1.pdf

Description:: IC OFFLINE SWITCH FLYBACK 8DIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ICE2QR1765XKLA1 from Infineon Technologies is a quasi-resonant PWM controller IC with integrated 650V CoolMOS® and startup cell in PG-DIP-8 package, designed for off-line SMPS in LCD monitors, DVD/Blu-ray players, and set-top boxes. It delivers 56.4W max input power at 230VAC ±15%, features Active Burst Mode (<100mW no-load standby), digital frequency reduction, and built-in foldback current limiting.

For engineers reviewing the ICE2QR1765XKLA1 datasheet, ICE2QR1765XKLA1 pinout, ICE2QR1765XKLA1 application, or ICE2QR1765XKLA1 equivalent, key selection criteria include integrated high-voltage startup capability, zero-crossing–based QR timing control, VCC undervoltage/overvoltage auto-restart protection, and cycle-by-cycle current sensing with adjustable OVP latch-off.

Technical Context

The ICE2QR1765XKLA1 implements peak-current-mode quasi-resonant control using a digital up/down counter synchronized to transformer demagnetization via ZC pin detection. Its internal CoolMOS® drain connects directly to Pin 4/5, enabling self-powered startup through an integrated high-voltage current source that pre-charges VCC to 13.5V before enabling soft-start.

Digital frequency reduction adjusts switching frequency downward under light load by incrementing the ZC counter threshold, while Active Burst Mode disables PWM bursts entirely below ~10% load-reducing average switching loss and achieving <0.1W standby input power. Protection logic includes cycle-by-cycle CS-based current limiting, foldback point correction, and auto-restart on VCC UV/OV, overload, and overtemperature events.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	650V - avalanche-rugged drain rating supports universal AC input (85–265VAC) without external snubber stress.
R_DS(on)	1.7Ω @ T_j=25°C - enables efficient primary-side conduction in low-to-mid power SMPS (≤56W).
Max Input Power	56.4W @ 230VAC ±15%, T_a=50°C - defines thermal design envelope for DIP-8 PCB layout without heatsink.
Standby Power	<100mW @ no load - achieved via Active Burst Mode with controllable output ripple and minimal transformer audible noise.
Soft-Start Time	12ms digital ramp - limits inrush current and reduces stress on CoolMOS®, output diodes, and transformer during power-up.
V_CC Operating Range	9.5V to 25V - wide supply window accommodates auxiliary winding regulation variance and brown-out resilience.
OVP Response	Latch-off mode - halts switching permanently until power cycle upon detected overvoltage at FB or shorted transformer winding.

Pinout & Package

Package: PG-DIP-8 (Plastic Dual-In-Line Package, 8-pin, 0.3" width, creepage ≥5.5mm). Pins 4 and 5 are internally shorted as common Drain terminal for the integrated CoolMOS®.

Pin/Terminal	Circuit Role	Design Meaning
1 ZC	Zero-Crossing Detection Input	Accepts delayed auxiliary winding voltage to trigger MOSFET turn-on at valley point; also serves as OVP sense node.
2 FB	Feedback Voltage Input	Regulates output via optocoupler; controls QR frequency reduction, burst entry/exit, and open-loop protection.
3 CS	Current Sense Input	Monitors primary peak current via shunt resistor; enables cycle-by-cycle limiting and short-winding detection.
4,5 Drain	CoolMOS® Drain Terminal	High-side power switch output; connects directly to bulk capacitor; rated 650V with avalanche ruggedness.
6 n.c.	No Connection	Unbonded pad; must remain unconnected per datasheet to avoid malfunction or ESD path disruption.
7 VCC	IC Supply Input	Powered by startup cell pre-charge or auxiliary winding; regulated internally between 9.5V–25V for stable operation.
8 GND	Controller Ground Reference	Common return for all analog/digital blocks; separate from power ground plane to minimize noise coupling into CS/FB.

Key Features

Feature	Design Value
Integrated 650V Startup Cell	Eliminates external HV start-up resistor network; provides controlled ~1mA pre-charge current to VCC until 13.5V turn-on threshold.
Digital Frequency Reduction	Reduces switching frequency progressively below full load by adjusting ZC counter threshold based on FB voltage-cutting switching loss without compromising regulation.
Built-in Digital Soft-Start	12ms 4-step ramp of CS current limit (0.32V → 1.0V) prevents transformer saturation and limits inrush stress on primary components.
Foldback Point Correction	Automatically lowers current limit threshold under low-line/high-load conditions to maintain safe SOA margin and prevent thermal runaway.
Auto-Restart Protections	VCC UV/OV, overload, and overtemperature faults trigger automatic restart after timeout-enabling field-recoverable fault handling without manual reset.

Applications

LCD Monitor Power Supply

DVD/Blu-ray Player SMPS

Use Scenario: 24W–45W auxiliary and main rail generation from universal AC input in compact desktop display enclosures.

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

Use Value: Enables >85% efficiency at full load and <100mW standby without auxiliary winding redesign or added discrete circuitry.

Use Scenario: Dual-output (5V/12V) flyback converter powering laser diode drivers, servo motors, and digital logic in optical disc drives.

IC Role / Device Role / Timing Role: Integrated power switch + QR controller providing precise current-mode timing, burst-mode sleep, and transformer demag synchronization.

Use Value: Reduces EMI emissions by 6–10dB compared to fixed-frequency PWM, easing EMC compliance for CE/FCC Class B certification.

Set-Top Box Adapter

Compact AC-DC Wall Adapter

Use Scenario: 12W–25W isolated DC output for IPTV/OTT streaming devices requiring tight output tolerance and low no-load consumption.

IC Role / Device Role / Timing Role: Quasi-resonant controller with Active Burst Mode ensuring stable regulation across line/load transients and zero-power idle states.

Use Value: Meets Energy Star 6.0 and EU CoC Tier 2 standby requirements without secondary-side controller or complex bias winding management.

Use Scenario: 5W–15W single-output adapter for IoT gateways and smart home hubs where size, cost, and no-load power are critical.

IC Role / Device Role / Timing Role: Fully integrated QR solution combining HV startup, PWM control, and 650V switch in one DIP-8 footprint.

Use Value: Cuts BOM count by ≥4 components (startup resistor, HV diode, VCC cap, external MOSFET) versus discrete controller + FET designs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE2QR2265Z	Same Q1 family, but 2.2Ω R_DS(on) and 42W max input power at 230VAC - lower conduction loss not required for ≤30W designs.	Targeted at cost-sensitive <30W adapters; reduced thermal margin vs. ICE2QR1765XKLA1 in same PCB area.	Select when full 56W headroom is unnecessary and BOM cost optimization outweighs efficiency trade-offs.
ICE3BR1765J	Q2-generation CoolSET® with improved burst-mode ripple control, higher V_CC UVLO (10.5V), and enhanced ZC noise immunity - not pin-compatible due to different FB/CS thresholds.	Designed for next-gen ultra-low-noise audio/video supplies; requires layout and compensation revision.	Choose for new designs needing tighter output stability under dynamic load or stricter EMI targets; not drop-in replacement.

Compared with ICE2QR2265Z and ICE3BR1765J, the ICE2QR1765XKLA1 offers optimal balance of power density, proven reliability in mature consumer platforms, and direct compatibility with legacy DIP-8 layouts-making it ideal for production continuity and mid-power (30–55W) replacements.

Availability

ICE2QR1765XKLA1 is available at Aetrix Electronics and suitable for LCD monitor power supplies, DVD/Blu-ray player SMPS, and set-top box adapters requiring stable component supply, long-term lifecycle support, and qualified industrial-grade sourcing.

Supply support for ICE2QR1765XKLA1 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 leader specializing in power management, automotive MCUs, and industrial control ICs, with global manufacturing and quality certification to IATF 16949 and ISO 9001.

The CoolSET®-Q1 product line was engineered specifically for cost-effective, high-efficiency off-line SMPS in consumer electronics-integrating HV startup, QR control, and rugged CoolMOS® in single-package solutions to reduce system complexity and improve time-to-market.

FAQ

What is the purpose of the ZC pin, and how does it affect QR operation?

The ZC (Zero Crossing) pin receives a delayed signal from the transformer auxiliary winding to detect demagnetization completion. Internally, it triggers MOSFET turn-on at the first valley point after core reset-ensuring quasi-resonant switching that minimizes voltage stress and EMI. It also serves as the input for output overvoltage detection by comparing ZC voltage against an internal threshold.

Can ICE2QR1765XKLA1 operate without an auxiliary winding?

No. The auxiliary winding is mandatory: it powers the IC via the VCC pin after startup, enables ZC detection for QR timing, and provides feedback regulation through the FB pin. The integrated startup cell only pre-charges VCC initially; sustained operation requires energy transfer from the auxiliary winding once output voltage builds.

How does Active Burst Mode reduce standby power below 100mW?

Active Burst Mode stops all PWM switching when load falls below ~10%, entering a low-power sleep state where only essential monitoring circuits remain active. The IC wakes periodically to sample FB voltage; if regulation error exceeds threshold, it resumes brief PWM bursts until output stabilizes-achieving <0.1W input power while maintaining tight output voltage hold-up.

Is Pin 6 (n.c.) allowed to be grounded or left floating on PCB?

Pin 6 must remain unconnected-neither grounded nor tied to any net. It is an unused, unbonded pad inside the PG-DIP-8 package. Connecting it risks internal leakage paths, noise coupling into sensitive analog nodes (FB/CS), or unpredictable behavior during ESD events, as confirmed in Infineon's package documentation and layout guidelines.

ICE2QR1765XKLA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: CoolMOS™, CoolSET™-Q1

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

Packaging:: Tube

Product Status:: Active

Output Isolation:: Isolated

Internal Switch(s):: Yes

Voltage - Breakdown:: 650V

Topology:: Flyback

Voltage - Start Up:: 18 V

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

Duty Cycle:: 50%

Frequency - Switching:: 52kHz

Power (Watts):: 56.4 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-8

Mounting Type:: Through Hole

ICE2QR1765XKLA1 FAQ

1.How can I place an order for ICE2QR1765XKLA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for ICE2QR1765XKLA1 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 ICE2QR1765XKLA1 reliable?

The price and inventory of ICE2QR1765XKLA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICE2QR1765XKLA1 is usually 5 days.

3.What payment methods are accepted for ICE2QR1765XKLA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICE2QR1765XKLA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ICE2QR1765XKLA1?

ICE2QR1765XKLA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ICE2QR1765XKLA1 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 ICE2QR1765XKLA1?

For technical support, including ICE2QR1765XKLA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICE2QR1765XKLA1 requirements.

6.How does Aetrix verify that ICE2QR1765XKLA1 is sourced from the original manufacturer or authorized distributors?

All ICE2QR1765XKLA1 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 ICE2QR1765XKLA1 meets industry standards.

7.What is the process for return or replacement of ICE2QR1765XKLA1?

All ICE2QR1765XKLA1 units undergo pre-shipment inspection (PSI). If there is an issue with ICE2QR1765XKLA1, 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 ICE2QR1765XKLA1 part is unused and in its original packaging.

Return procedure for ICE2QR1765XKLA1:

1.Submit a request within 90 days.

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

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