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

Infineon Technologies TDA16846HKLA1

Name: TDA16846HKLA1
Brand: Infineon Technologies
SKU: TDA16846HKLA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA16846HKLA1

Manufacturer:: Infineon Technologies

Category:: Power Supply Controllers, Monitors

Package:: 14-DIP (0.300", 7.62mm)

Datasheet:: TDA16846HKLA1.pdf

Description:: IC POWER SUPPLY CONTROLLER 14DIP

Quantity:: RFQ Add To RFQ list

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Inventory:4,306

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Product details

Overview

TDA16846HKLA1 from Infineon Technologies is a bipolar PWM quasi-resonant (QR) controller IC for flyback switch-mode power supplies with integrated Power Factor Correction (PFC) support, 14-pin DIP package, 5 V reference output (pin 9), 1.2 V fault comparator 2 threshold (pin 6), and adjustable standby frequency down to 20 kHz. It enables low-power standby operation in TV, SAT receiver, and PC monitor SMPS designs.

For engineers reviewing the TDA16846HKLA1 datasheet, TDA16846HKLA1 pinout, TDA16846HKLA1 application, or TDA16846HKLA1 equivalent, key selection criteria include its quasi-resonant zero-voltage switching capability, mains voltage-dependent fold-back point correction, soft-start timing control via external capacitor (pin 4), and dual fault comparators for overcurrent and primary voltage monitoring.

Technical Context

The TDA16846HKLA1 implements a bipolar-based quasi-resonant flyback controller with adaptive frequency reduction under light load, enabling <200 mW standby consumption. Its regulation loop combines internal error amplifier input (pin 3) and optocoupler feedback path (pin 5), supporting both free-running and synchronized/fixed-frequency modes via pin 7 RC network or external sync pulses.

Protection architecture includes VCC over/undervoltage lockout (14.5 V / 9.5 V thresholds), primary voltage check (pin 11, 1 V trip), two independent fault comparators (pins 6 and 10), and ringing suppression timing controlled by pin 1 RC network. Startup current is <100 µA until VCC exceeds 14.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Topology Support	Flyback converter with quasi-resonant (QR) zero-voltage switching and optional PFC stage
Standby Frequency	Adjustable down to 20 kHz via external RC on pin 1 - reduces audible noise and core losses at light load
VCC Thresholds	Turn-on at 14.5 V, turn-off at 9.5 V - ensures stable startup and brownout protection
Fault Comparator 2 Threshold	1.2 V on pin 6 - triggers immediate shutdown for overcurrent or thermal fault detection
Reference Output	5 V ±2% at pin 9 - powers external circuitry and enables fault comparator 2 via pull-down resistor
Startup Current	<100 µA until VCC reaches 14.5 V - eliminates need for external high-value start-up resistor
Primary Voltage Check	1 V threshold on pin 11 - disables SMPS during mains undervoltage and enables fold-back correction

Pinout & Package

Package: P-DIP-14-3 (14-pin dual in-line plastic package, 0.3 inch body width, 0.1 inch lead pitch).

Pin/Terminal	Circuit Role	Design Meaning
1 OTC	Off-Time Control	RC network sets ringing suppression time and standby frequency - critical for EMI reduction and light-load stability
2 PCS	Primary Current Simulation	Capacitor + resistor network quantifies max output power - enables current limiting without sense resistor
3 RZI	Regulation & Zero-Crossing Input	Error amplifier input + zero-cross detection - enables primary-side regulation and QR timing alignment
4 SRC	Soft-Start & Regulation Capacitor	Capacitor value determines soft-start duration and control loop bandwidth - prevents inrush stress
5 OCI	Opto-Coupler Input	Direct optocoupler collector connection - supports secondary-side feedback with no series resistor required
6 FC2	Fault Comparator 2 Input	1.2 V trip level - used for overtemperature or auxiliary overcurrent shutdown
7 SYN	Synchronization Input	Accepts external sync pulses or RC network - enables fixed-frequency mode and avoids transformer saturation at startup
8 N.C.	No Connect	Not bonded - must be left floating; distinguishes TDA16846HKLA1 from TDA16847-2 (which uses pin 8 for PMO)
9 REF	5 V Reference Output	Stable 5 V supply for external bias and fault comparator enable - requires pull-down resistor to activate FC2
10 FC1	Fault Comparator 1 Input	1 V trip level - dedicated shutdown input for primary overvoltage or fast overcurrent events
11 PVC	Primary Voltage Check	Monitors rectified mains via voltage divider - trips at 1 V to prevent operation below safe input range
12 GND	Signal Ground	Common return for all analog and digital functions - must be low-impedance and separated from power ground
13 OUT	Gate Driver Output	Push-pull driver capable of sourcing/sinking >100 mA - directly drives MOSFET gate with minimal external components
14 VCC	Supply Voltage Input	Powered initially by startup capacitor (C14), then by auxiliary winding - internal diode eliminates external start-up resistor

Key Features

Feature	Design Value
Quasi-Resonant Zero-Voltage Switching	Reduces switching losses and EMI by ensuring MOSFET turns on only at valley points of drain voltage waveform
Adjustable Standby Frequency	Set via pin 1 RC network to 20 kHz minimum - maintains efficiency while eliminating audible transformer whine
Mains Voltage Dependent Fold-Back	Automatically lowers current limit as input voltage drops - prevents transformer saturation during brownout
Two Independent Fault Comparators	Pins 6 and 10 provide dedicated, non-latching shutdown paths for overcurrent, overvoltage, and thermal faults
Integrated Soft-Start	Controlled by external capacitor on pin 4 - ramps output frequency gradually to avoid inrush current spikes

Applications

TV Power Supply

SAT Receiver SMPS

Use Scenario: 100–200 W offline flyback converter powering main board and display backlight in CRT/LCD TVs.

IC Role / Device Role / Timing Role: Primary-side QR controller managing PFC pre-regulator and main flyback stage with synchronized burst-mode standby.

Use Value: Enables <0.5 W no-load consumption and meets IEC 61000-3-2 Class D harmonic limits via integrated PFC support.

Use Scenario: 30–60 W universal-input SMPS for satellite set-top boxes with strict standby power requirements.

IC Role / Device Role / Timing Role: Quasi-resonant controller implementing adaptive frequency scaling and primary-side regulation without optocoupler.

Use Value: Achieves 20 kHz minimum switching frequency to eliminate audible noise while maintaining ±5% output regulation across line/load.

PC Monitor PSU

VCR Power Module

Use Scenario: 50–120 W multi-output flyback supply delivering +5 V, +12 V, and -12 V for analog/digital video circuits.

IC Role / Device Role / Timing Role: Main PWM controller with dual fault comparators monitoring primary current and auxiliary rail overvoltage.

Use Value: Provides robust protection against CRT flyback transformer arcing and secondary rectifier short-circuits.

Use Scenario: Compact 25 W linear-compatible replacement SMPS for legacy VCR tape transport and servo systems.

IC Role / Device Role / Timing Role: Low-startup-current QR controller enabling direct replacement of 78xx linear regulators with improved efficiency.

Use Value: Reduces thermal load by 60% versus linear design while maintaining tight ripple (<50 mVpp) on 12 V motor supply rail.

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
ICE2QS01G	Integrated 650 V CoolMOS driver, higher VCC UVLO (10.5 V), no pin 8 PMO function	Targeted for higher-efficiency 50–150 W adapters; lacks primary voltage fold-back correction	Select when higher integration and lower component count outweigh need for mains-dependent fold-back
KA5Q1265RTD	Bipolar process, fixed 67 kHz frequency, no QR capability, single fault comparator	Designed for cost-sensitive DVD/VCR supplies; no standby frequency adjustment or PFC support	Select only for non-PFC, fixed-frequency designs where QR efficiency gains are not required

Compared with ICE2QS01G and KA5Q1265RTD, the TDA16846HKLA1 uniquely combines quasi-resonant valley switching, adjustable standby frequency, and mains-dependent fold-back - making it optimal for consumer electronics requiring <0.5 W no-load power and robust brownout behavior.

Availability

TDA16846HKLA1 is available at Aetrix Electronics and suitable for TV power supplies, SAT receiver SMPS, and PC monitor PSU designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TDA16846HKLA1 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 manufacturing and quality certification to ISO/TS 16949 and AEC-Q100 standards.

The TDA16846HKLA1 belongs to Infineon's legacy bipolar SMPS controller product line, engineered specifically for quasi-resonant flyback topologies in consumer electronics with stringent standby power and EMI requirements.

FAQ

What is the minimum recommended value for the startup capacitor on pin 14?

The datasheet specifies a minimum 10 µF electrolytic capacitor with low ESR on pin 14. This value ensures reliable startup under worst-case conditions (low input voltage, cold temperature) while allowing the auxiliary winding to take over before C14 discharges below 9.5 V. A 100 nF ceramic RF snubber in parallel is also recommended to suppress high-frequency transients.

Can pin 5 (OCI) be used without an optocoupler?

Yes - pin 5 can be left open or pulled to ground via a resistor if primary-side regulation is used exclusively. When using the internal error amplifier (pin 3), the voltage divider at pin 3 must be scaled so that pulses remain below 5 V to prevent unintended regulation interference. Pin 5 remains inactive in this configuration.

How does the primary voltage check (pin 11) interact with fold-back correction?

Pin 11 serves dual roles: as a hard shutdown trigger at 1 V (mains undervoltage) and as a fold-back correction input in free-running mode. When input voltage decreases, the fold-back circuit dynamically lowers the current limit threshold proportionally - preventing transformer saturation while maintaining regulation until the 1 V trip point is reached.

Is TDA16846HKLA1 pin-compatible with TDA16846-2G?

No - TDA16846HKLA1 uses the P-DIP-14-3 package, while TDA16846-2G uses the surface-mount P-DSO-14-3 package. Though electrically identical, their mechanical footprints and thermal characteristics differ significantly; PCB layout and reflow profiles must be redesigned for the SOIC variant.

TDA16846HKLA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

Package/Case:: 14-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Applications:: Power Supply Controller

Voltage - Input:: -

Voltage - Supply:: 8V ~ 16V

Current - Supply:: 5 mA

Operating Temperature:: -25°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: PG-DIP-14-3

TDA16846HKLA1 FAQ

1.How can I place an order for TDA16846HKLA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA16846HKLA1 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 TDA16846HKLA1 reliable?

The price and inventory of TDA16846HKLA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA16846HKLA1 is usually 5 days.

3.What payment methods are accepted for TDA16846HKLA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA16846HKLA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TDA16846HKLA1?

TDA16846HKLA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA16846HKLA1 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 TDA16846HKLA1?

For technical support, including TDA16846HKLA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA16846HKLA1 requirements.

6.How does Aetrix verify that TDA16846HKLA1 is sourced from the original manufacturer or authorized distributors?

All TDA16846HKLA1 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 TDA16846HKLA1 meets industry standards.

7.What is the process for return or replacement of TDA16846HKLA1?

All TDA16846HKLA1 units undergo pre-shipment inspection (PSI). If there is an issue with TDA16846HKLA1, 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 TDA16846HKLA1 part is unused and in its original packaging.

Return procedure for TDA16846HKLA1:

1.Submit a request within 90 days.

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

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