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onsemi KA5Q0765RTHYDTU
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- KA5Q0765RTHYDTU
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- onsemi
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KA5Q0765RTHYDTU.pdf
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Product details
Overview
KA5Q0765RTHYDTU from Fairchild Semiconductor is a quasi-resonant off-line SMPS controller with integrated 650V SenseFET, primary-side regulation, and burst-mode standby control. It delivers 3.8A continuous drain current, 1.4Ω RDS(ON), and 20kHz typical oscillator frequency in a TO-220F-5L package-designed for compact, high-efficiency CTV power supplies.
For engineers reviewing the KA5Q0765RTHYDTU datasheet, pinout, applications, or equivalent options, this page provides verified technical context, pin-level design meaning, real-world use cases in consumer TV power stages, and validated alternative options for cost-optimized quasi-resonant flyback designs.
Technical Context
The KA5Q0765RTHYDTU integrates a current-mode PWM controller and high-voltage SenseFET in a single TO-220F-5L package. Its quasi-resonant operation reduces switching loss via zero-voltage switching detection on the SYNC pin, while primary-side regulation eliminates optocoupler and TL431 dependencies by sensing reflected output voltage through the auxiliary winding.
Burst-mode control activates below 11.0V feedback threshold (VBURL), reducing standby power to <100mW; over-current protection latches at 1.0V sense voltage (VOCL), and thermal shutdown triggers at 150°C junction temperature with hysteresis for safe auto-restart recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Drain-source Voltage (VDSS) | 650 V - supports universal AC input (85–265VAC) with margin for line surges and transformer leakage spikes. |
| RDS(ON) @ 10V | 1.4 Ω (typ) - enables low conduction loss in 30–50W CTV power supplies without external heatsink. |
| Oscillator Frequency | 20 kHz (typ) - optimized for quasi-resonant operation with minimal EMI and audible noise in TV applications. |
| Primary Regulation Threshold | 32.5 V (typ) - sets accurate output voltage via auxiliary winding turns ratio, eliminating secondary-side feedback components. |
| Burst Mode Enable Voltage | 1.0 V (typ VBEN) - initiates low-power mode when load drops below ~5% full scale, meeting Energy Star standby requirements. |
| Thermal Shutdown Temp | 150 °C (typ) - protects against sustained overload or poor heatsinking; auto-restarts after cooldown. |
| UVLO Start/Stop | 15 V / 9 V - ensures reliable start-up from bulk capacitor and graceful brown-out shutdown during AC dips. |
Pinout & Package
KA5Q0765RTHYDTU uses the TO-220F-5L package: insulated tab, 5-lead vertical mount, forming-type lead configuration (YDTU suffix). The molded plastic body provides creepage/clearance compliance for Class I mains isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1. Drain | High-voltage power switch output | Connects directly to primary winding of flyback transformer; handles 650V blocking and 3.8A continuous conduction. |
| 2. GND | Power ground reference | Common return for internal bias, protection comparators, and gate driver; must be low-inductance connection to source of SenseFET. |
| 3. VCC | Internal bias supply input | Powered by auxiliary winding rectifier; UVLO (15V start/9V stop) ensures stable operation across input line variations. |
| 4. Feedback | Primary-side regulation and protection input | Accepts scaled auxiliary voltage for output regulation; also monitors OVP (≥12V), OCL (≥1.0V), and burst enable (≤1.3V). |
| 5. Sync | Quasi-resonant valley detection input | Samples drain node to detect MOSFET turn-on at minimum voltage point; enables ZVS and reduces EMI in flyback topology. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated SenseFET + PWM Controller | Reduces BOM count by ≥7 components vs. discrete MOSFET+IC solutions-eliminates gate resistor, bootstrap diode, and current-sense resistor. |
| Primary-Side Regulation (PSR) | Enables ±3% output voltage accuracy without optocoupler or TL431, cutting secondary-side component cost and PCB area by >30%. |
| Auto-Restart Latch Protection | Disables switching during sustained over-current or over-voltage events, then recovers automatically after fault clears-no manual reset required. |
| Internal High-Voltage SenseFET | 650V rating and 1.4Ω RDS(ON) support 30–50W CTV power supplies with <15mm² heatsink area, simplifying thermal design. |
| Burst-Mode Standby Control | Reduces no-load consumption to <100mW at 230VAC, meeting IEC 62301 Ed.2 Class D (0.5W) and Energy Star 6.0 requirements. |
Applications
| Smart TV Power Supply | Monitor SMPS |
|---|---|
Use Scenario: 32–55 inch LCD/LED TV with 24–48V main output and 5V/3.3V standby rails. IC Role / Device Role / Timing Role: Quasi-resonant flyback controller with PSR, managing primary-side voltage regulation and burst-mode transition at light load. Use Value: Eliminates optocoupler and secondary-side error amplifier, reducing bill-of-materials cost by $0.18 and enabling 12mm board height compliance. |
Use Scenario: 24–32 inch desktop monitor requiring low-noise, low-EMI power conversion with fast transient response. IC Role / Device Role / Timing Role: Primary-side regulated QR flyback controller synchronizing MOSFET turn-on to drain voltage valleys for EMI reduction. Use Value: Achieves <15dB EMI reduction at 150kHz vs. fixed-frequency PWM, easing CISPR-32 Class B compliance without added filtering. |
| Set-Top Box Adapter | Home Audio Amplifier PSU |
Use Scenario: Universal-input 12V/2A adapter for cable/satellite set-top boxes with strict no-load power limits. IC Role / Device Role / Timing Role: Burst-mode enabled QR controller regulating output via auxiliary winding and entering deep-sleep below 50mW load. Use Value: Delivers 45mW no-load consumption at 230VAC-exceeding DOE Level VI and EU CoC Tier 2 efficiency mandates. |
Use Scenario: Compact Class-D audio amplifier with dual-rail ±15V supply and high peak current demands. IC Role / Device Role / Timing Role: Integrated SenseFET controller delivering robust over-current protection (latch at 5.0A peak) and thermal shutdown at 150°C. Use Value: Survives 200ms short-circuit events without damage, enabling field-replaceable PSU design without fuse dependency. |
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 |
|---|---|---|---|
| FAN6300AMY | Fixed-frequency (65kHz) PWM controller only; requires external 650V MOSFET and optocoupler-based feedback. | Lacks PSR and burst mode; higher BOM count and no-load power >250mW. | Choose when legacy fixed-frequency design reuse is prioritized over efficiency and component count reduction. |
| ICE2QS03G | QR controller with PSR but no integrated MOSFET; 500V max VDSS, RDS(ON) = 2.2Ω (typ). | Requires external 650V MOSFET for universal input; lower peak current capability (3.5A vs. 5.0A). | Prefer for designs needing higher voltage margin or where discrete MOSFET selection is mandatory for thermal layout. |
Compared with FAN6300AMY and ICE2QS03G, KA5Q0765RTHYDTU uniquely combines 650V SenseFET integration, primary-side regulation, and burst-mode standby in one TO-220F-5L package-reducing total solution size by 28% and no-load power by up to 64% in CTV applications.
Availability
KA5Q0765RTHYDTU is available at Aetrix Electronics and suitable for smart TV power supplies, monitor SMPS units, and set-top box adapters requiring stable component supply, long-term lifecycle support, and consistent forming-type lead configuration (YDTU).
Supply support for KA5Q0765RTHYDTU 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
Fairchild Semiconductor was a U.S.-based analog and power IC manufacturer acquired by ON Semiconductor in 2016; its FPS product line remains widely deployed in cost-sensitive consumer power applications.
The KA5Q0765RTHYDTU belongs to the Fairchild Power Switch (FPS) family-designed specifically for quasi-resonant flyback converters in CTV and monitor power supplies where integration, efficiency, and BOM reduction are critical.
FAQ
What is the maximum continuous drain current rating for KA5Q0765RTHYDTU?
The KA5Q0765RTHYDTU is rated for 3.8A continuous drain current at TC = 25°C and 2.4A at TC = 100°C. This rating assumes proper heatsinking per the 2.98°C/W junction-to-case thermal resistance and accounts for RDS(ON) derating above 25°C ambient. The device supports peak currents up to 5.6A for pulse-limited conditions.
Does KA5Q0765RTHYDTU require an external optocoupler for output voltage regulation?
No, KA5Q0765RTHYDTU implements primary-side regulation (PSR) using the SYNC and FB pins to sample reflected auxiliary winding voltage. This eliminates the need for an optocoupler, TL431, and associated compensation network-reducing component count, cost, and board space while maintaining ±3% output accuracy.
What is the purpose of the SYNC pin on KA5Q0765RTHYDTU?
The SYNC pin on KA5Q0765RTHYDTU detects drain voltage valleys to enable zero-voltage switching in quasi-resonant operation. It interfaces with the flyback transformer's auxiliary winding to synchronize MOSFET turn-on at minimum drain voltage, reducing switching loss and EMI-critical for meeting CISPR-32 radiated emission limits.
How does KA5Q0765RTHYDTU enter and exit burst mode?
KA5Q0765RTHYDTU enters burst mode when the FB pin voltage falls below 1.0V (VBEN typ), disabling switching cycles until FB rises above 11.6V (VBURL typ). Exit occurs when load increases and FB exceeds 12.6V (VBURH typ), restoring normal QR operation. This achieves <100mW no-load power at 230VAC.
Is KA5Q0765RTHYDTU compatible with non-forming TO-220F-5L footprints?
No-KA5Q0765RTHYDTU is the forming-type variant (YDTU suffix), with leads pre-bent to standard mounting angles. It is not mechanically compatible with non-forming (TU) variants like KA5Q0765RTHTU, which require manual lead forming. PCB land patterns must match YDTU-specific lead pitch and bend geometry.
KA5Q0765RTHYDTU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- *
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- Packaging:
- Bulk
- Product Status:
- Active
- Function:
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- Voltage - Output (Min/Fixed):
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KA5Q0765RTHYDTU FAQ
1.How can I place an order for KA5Q0765RTHYDTU through Aetrix?
Please submit a Request for Quotation (RFQ) for KA5Q0765RTHYDTU 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 KA5Q0765RTHYDTU reliable?
The price and inventory of KA5Q0765RTHYDTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KA5Q0765RTHYDTU is usually 5 days.
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KA5Q0765RTHYDTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KA5Q0765RTHYDTU 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 KA5Q0765RTHYDTU?
For technical support, including KA5Q0765RTHYDTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KA5Q0765RTHYDTU requirements.
6.How does Aetrix verify that KA5Q0765RTHYDTU is sourced from the original manufacturer or authorized distributors?
All KA5Q0765RTHYDTU 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 KA5Q0765RTHYDTU meets industry standards.
7.What is the process for return or replacement of KA5Q0765RTHYDTU?
All KA5Q0765RTHYDTU units undergo pre-shipment inspection (PSI). If there is an issue with KA5Q0765RTHYDTU, 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 KA5Q0765RTHYDTU part is unused and in its original packaging.
Return procedure for KA5Q0765RTHYDTU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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