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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Power Supply Controllers, Monitors

Infineon Technologies TDA46052HKLA1

Name: TDA46052HKLA1
Brand: Infineon Technologies
SKU: TDA46052HKLA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA46052HKLA1

Manufacturer:: Infineon Technologies

Category:: Power Supply Controllers, Monitors

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

Datasheet:: TDA46052HKLA1.pdf

Description:: IC POWER SUPPLY CONTROLLER 8DIP

Quantity:: RFQ Add To RFQ list

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Inventory:2,177

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Product details

Overview

TDA46052HKLA1 from Infineon Technologies is a bipolar PWM quasi-resonant (QR) controller IC designed for free-running flyback SMPS using external MOSFETs. It integrates primary-side regulation, fold-back overcurrent protection, undervoltage lockout (V_3L = 7.5 V), soft-start, thermal shutdown, and on-chip ringing suppression. Operates across 180–264 V_AC input with burst-mode no-load operation at 20–40 kHz - deployed in 70 W video recorder power supplies.

For engineers reviewing the TDA46052HKLA1 datasheet, TDA46052HKLA1 pinout, TDA46052HKLA1 application, or TDA46052HKLA1 equivalent, key selection criteria include its primary-side sensing architecture, line-voltage-dependent fold-back compensation, zero-crossing detection via pin 8, and P-DIP-8-1 package compatibility with discrete gate-drive layouts for industrial and consumer flyback converters.

Technical Context

The TDA46052HKLA1 implements a self-oscillating quasi-resonant control scheme where switching frequency varies inversely with load and AC input voltage. Its regulation loop uses transformer auxiliary winding feedback (pin 1) combined with primary current simulation (pin 2) and primary voltage monitoring (pin 3) to dynamically adjust pulse width and fold-back threshold.

It features a push-pull output stage (pin 5) capable of sourcing/sinking gate charge for discrete N-channel MOSFETs, with internal reference generation tied to supply voltage (pin 6) and soft-start integration (pin 7). Zero-crossing detection at pin 8 triggers each cycle after full energy transfer, suppressing false triggering from transformer ringing via external RC filtering.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology Support	Free-running quasi-resonant flyback with primary-side regulation - eliminates optocoupler and secondary-side TL431.
Input Voltage Range (V_IN)	180–264 V_AC (wide-range mains); undervoltage lockout activates below V_3L = 7.5 V (pin 3).
Switching Frequency	Variable: 20–40 kHz in burst mode (no load); decreases with increasing load and decreasing AC input.
Output Drive	Push-pull gate driver (pin 5) - directly interfaces with discrete MOSFET gates without external buffers.
Fold-back Protection	Line-voltage-compensated current limiting - RC network at pin 2 sets peak primary current; pin 3 adjusts fold-back point vs. V_AC.
Start-up & Stability	Soft-start via capacitor at pin 7 - prevents audible transformer noise and inrush stress; on-chip ringing suppression reduces EMI.
Thermal Protection	Chip-over-temperature shutdown - halts operation if junction temperature exceeds safe limit; auto-recovery on cooldown.

Pinout & Package

Packaged in P-DIP-8-1 (Plastic Dual-In-Line, 8-pin, 0.3 inch width, standard lead pitch), compliant with JEDEC MS-001.

Pin/Terminal	Circuit Role	Design Meaning
1	Regulation Feedback Input	Accepts rectified/stepped-down voltage from transformer auxiliary winding; compared to internal 2.5 V reference for closed-loop voltage control.
2	Primary Current Simulation Input	RC network emulates primary current ramp; termination threshold sets max energy per cycle and fold-back point.
3	Primary Voltage Monitoring Input	Detects low-line condition (V₃ < 7.5 V) and scales fold-back current with AC input level (V_3H/V_3L = 1.7).
4	Ground Reference	Power and signal ground return for all internal blocks and external bias networks.
5	MOSFET Gate Driver Output	Push-pull stage drives external N-MOSFET gate; high-current capability supports fast turn-on/turn-off without external drivers.
6	V_CC Supply Input	Derives internal references (V_REF, V_6A, V_6E, etc.); logic enabled only when 10.5 V < V₆ < 25 V.
7	Soft-Start & Integrator Input	Capacitor to ground sets start-up ramp time and provides integrator function for control amplifier stability.
8	Oscillator Zero-Cross Trigger	Detects falling edge of auxiliary winding voltage at +50 mV threshold; initiates new switching cycle after full energy transfer.

Key Features

Feature	Design Value
Burst-mode no-load operation	Reduces standby power to <150 mW by cycling ON/OFF at 20–40 kHz - meets EU CoC Tier 2 requirements.
Line-compensated fold-back	Prevents transformer saturation and MOSFET overstress across 180–264 V_AC by scaling current limit with input voltage.
Integrated ringing suppression	Internal circuit rejects false zero-cross detections from transformer parasitic oscillations - improves reliability under short-circuit.
Undervoltage lockout (UVLO)	Disables switching if pin 3 voltage drops below 7.5 V - avoids unstable operation during brownout or startup sag.
Thermal shutdown with hysteresis	Halts operation above ~150 °C junction temperature; resumes only after cooling by ≥15 °C - prevents cumulative thermal damage.

Applications

Video Recorder Power Supply

Industrial AC/DC Adapter

Use Scenario: 70 W flyback converter powering analog/digital video recording systems with 3 isolated outputs (±12 V, +5 V).

IC Role / Device Role / Timing Role: Primary-side QR controller performing voltage regulation, overload fold-back, and burst-mode management without optocoupler.

Use Value: Eliminates secondary-side feedback components, reduces BOM count by 4 parts, and achieves <0.3% load regulation across 10–100% load range.

Use Scenario: Wide-input (180–264 V_AC) 40 W adapter for industrial PLC I/O modules requiring high immunity to line sags.

IC Role / Device Role / Timing Role: Quasi-resonant controller enabling ZVS turn-on, reducing MOSFET switching losses by 35% vs. fixed-frequency PWM.

Use Value: Maintains >82% efficiency at 20% load and survives 300 ms brownouts via UVLO hysteresis and soft-restart behavior.

Consumer Set-Top Box PSU

LED Driver Auxiliary Supply

Use Scenario: Compact 25 W flyback supplying main SoC rails and HDMI interface in cable/satellite set-top boxes.

IC Role / Device Role / Timing Role: Primary-sensing QR controller delivering tight output regulation while meeting CISPR-22 Class B conducted EMI limits.

Use Value: On-chip ringing suppression lowers radiated emissions by 8 dBμV at 30–100 MHz, eliminating need for snubber redesign.

Use Scenario: 5 W auxiliary supply powering LED driver ICs and dimming interface in commercial LED luminaires.

IC Role / Device Role / Timing Role: Low-noise QR controller operating in burst mode at 25 kHz - avoids audible transformer whine during standby.

Use Value: Soft-start capacitor (pin 7) ensures silent startup; integrated thermal shutdown prevents LED driver latch-up during thermal stress events.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ICE2QS03G	Fixed-frequency QR controller with integrated 650 V MOSFET; lacks primary voltage monitoring (pin 3) and line-compensated fold-back.	Requires fewer external components but cannot adapt fold-back threshold to AC input - less robust under wide-range line conditions.	Select when board space is critical and input voltage is stable; avoid for universal AC designs.
KA5Q1265RTD	Bipolar QR controller in DIP-8; includes V_CC OVP but no soft-start pin (pin 7) or zero-cross trigger (pin 8) - relies on external timing capacitor.	Lacks integrated ringing suppression and burst-mode optimization - higher EMI and audible noise risk at light loads.	Choose for cost-sensitive legacy designs where transformer ringing is mitigated externally.

Compared with ICE2QS03G and KA5Q1265RTD, the TDA46052HKLA1 uniquely combines line-voltage-dependent fold-back, dedicated zero-cross detection, and soft-start integration - making it optimal for universal-input, low-EMI, and silent-operation flyback PSUs where reliability across variable AC conditions is essential.

Availability

TDA46052HKLA1 is available at Aetrix Electronics and suitable for video recorder power supplies, industrial AC/DC adapters, set-top box PSUs, and LED driver auxiliary supplies requiring stable component supply, long-lifecycle support, and proven flyback control architecture.

Supply support for TDA46052HKLA1 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 TDA46052HKLA1 belongs to Infineon's legacy bipolar SMPS controller product line, engineered specifically for cost-effective, high-reliability primary-side regulated flyback converters in consumer and industrial power supplies.

FAQ

What is the recommended gate resistor value for driving an external MOSFET with TDA46052HKLA1?

A 10 Ω to 22 Ω non-inductive gate resistor is recommended between pin 5 and the MOSFET gate to dampen ringing and limit peak current to ≤1.5 A. Values below 10 Ω increase risk of shoot-through during transitions; values above 33 Ω slow turn-on and raise conduction losses. Layout must minimize trace inductance and use local 100 nF ceramic decoupling at pin 6.

How does the TDA46052HKLA1 achieve quasi-resonant operation without an external resonant capacitor?

The IC detects the natural zero-crossing of the transformer auxiliary winding voltage (via pin 8) after energy transfer completes, then triggers the next gate pulse at the valley of the drain-source ringing waveform. This exploits the inherent leakage inductance and MOSFET output capacitance - no external resonant capacitor is needed, simplifying design and improving efficiency at light loads.

Can the TDA46052HKLA1 be used in continuous conduction mode (CCM) flyback designs?

No - the TDA46052HKLA1 is explicitly designed for discontinuous conduction mode (DCM) and boundary conduction mode (BCM) quasi-resonant flyback operation. Its zero-cross detection (pin 8) and burst-mode logic assume full demagnetization before each cycle. CCM operation causes missed zero crossings and uncontrolled duty cycles, leading to overvoltage and thermal failure.

What is the maximum allowable voltage on pin 3, and what happens if exceeded?

Pin 3 accepts up to 25 V DC continuously; absolute maximum rating is 30 V. Exceeding 25 V risks permanent damage to the internal voltage comparator and fold-back compensation circuitry. The datasheet specifies V_3H/V_3L = 1.7 ratio - typical thresholds are 12.8 V (V_3H) and 7.5 V (V_3L). A resistive divider from rectified mains must ensure pin 3 never exceeds 25 V under surge or transient conditions.

TDA46052HKLA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Applications:: Power Supply Controller

Voltage - Input:: -

Voltage - Supply:: 7.5V ~ 15.5V

Current - Supply:: 11 mA

Operating Temperature:: -20°C ~ 85°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: PG-DIP-8

TDA46052HKLA1 FAQ

1.How can I place an order for TDA46052HKLA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA46052HKLA1 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 TDA46052HKLA1 reliable?

The price and inventory of TDA46052HKLA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA46052HKLA1 is usually 5 days.

3.What payment methods are accepted for TDA46052HKLA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA46052HKLA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA46052HKLA1?

TDA46052HKLA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA46052HKLA1 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 TDA46052HKLA1?

For technical support, including TDA46052HKLA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA46052HKLA1 requirements.

6.How does Aetrix verify that TDA46052HKLA1 is sourced from the original manufacturer or authorized distributors?

All TDA46052HKLA1 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 TDA46052HKLA1 meets industry standards.

7.What is the process for return or replacement of TDA46052HKLA1?

All TDA46052HKLA1 units undergo pre-shipment inspection (PSI). If there is an issue with TDA46052HKLA1, 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 TDA46052HKLA1 part is unused and in its original packaging.

Return procedure for TDA46052HKLA1:

1.Submit a request within 90 days.

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

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