1. Product Overview
The FSCQ1565RTYDTU, developed by ON Semiconductor, is a quasi-resonant PWM controller with an integrated 650V high-voltage SENSEFET, optimized for medium-power flyback AC-DC power supplies. By combining control logic and a power MOSFET into a single chip, this device significantly simplifies peripheral circuitry, reduces BOM cost, and meets stringent efficiency and standby power requirements.
With its quasi-resonant switching scheme and light-load power-saving mode, FSCQ1565RTYDTU enables designers to address the challenges of multi-output systems, EMI suppression, and green energy demands. It is widely applicable in consumer electronics, household appliances, LED drivers, and auxiliary power for industrial systems.
2. Key Features and Technical Specifications
Feature | Description |
Control Mode | Quasi-resonant PWM control, supports ZVS valley switching |
Integrated MOSFET | Built-in 650V SENSEFET, RDS(on) = 0.53 Ω (typ.) |
Startup/Operating Current | Startup: 25 μA; Operating: 7 mA (typical) |
Standby Mode | Auto Burst mode; supports system standby power < 100 mW |
Frequency Modulation | Adaptive switching frequency with jitter function to reduce EMI peaks |
Soft Start | 20 ms internal soft-start to minimize inrush current |
Protection Features | UVLO, OLP, OVP, TSD, AOCP for comprehensive system protection |
Thermal Resistance | θJC = 2.0°C/W, TO-220F insulation package enhances heat dissipation |
Output Power Capability | Supports up to 170 W (open-frame at 85–265 VAC input) |
3. Typical Applications
The high level of integration and energy-saving features make FSCQ1565RTYDTU suitable for a wide range of medium-power AC-DC applications, including but not limited to:
- Consumer Electronics Auxiliary Power: Standby supplies for TVs, set-top boxes, audio systems
- Adapters & Chargers: Multi-voltage outputs such as 12V/18V/24V
- Smart Appliances Power Modules: For products like robotic vacuum cleaners, rice cookers, air purifiers
- Industrial and Lighting Auxiliary Power: LED constant-voltage drivers, PLC/HMI backup supplies
4. Design Recommendations
To fully leverage the FSCQ1565RTYDTU’s performance, the following hardware design practices are recommended:
- Ground Isolation: Separate power and signal ground return paths to avoid noise feedback into the controller
- Local Decoupling: Place the Vcc decoupling capacitor as close to the IC as possible for power stability
- Drain Layout Optimization: High dv/dt at the MOSFET drain requires careful routing to minimize crosstalk
- Thermal Design:Use heatsinks for improved reliability during continuous full-load operation
5. Series Comparison Table
FSCQ1565RTYDTU belongs to ON Semiconductor’s FSCQ series, which shares a common architecture but scales power capability via the integrated MOSFET’s performance. The following table compares representative models to assist in platform design and product selection:
Model | RDS(on) (Typ.) | Max Output Power @230 VAC | Recommended Application |
1.4 Ω | 100 W | Compact adapters / Aux power | |
1.0 Ω | 130 W | LED drivers, small appliances | |
0.75 Ω | 170 W | Audio systems, main power boards | |
FSCQ1565RTYDTU | 0.53 Ω | 210 W | TV main power, multi-rail output |
Note: All models feature quasi-resonant control, integrated 650V SENSEFET, Burst mode, soft-start, and complete protection. The main differences lie in power levels and MOSFET characteristics.
6. Selection Advantages and Engineering Value
FSCQ1565RTYDTU offers multiple advantages for engineers and sourcing professionals:
Advantage Type | Description |
High Integration | Combines controller and MOSFET, saving board space and components |
Efficiency Optimization | Quasi-resonant, valley switching, and light-load Burst mode |
EMI Performance | Frequency jitter and dv/dt control ease EMI certification |
Cost-Effective | Fewer external components (filtering, protection, driver circuits) |
Platform Friendly | TO-220F package enables standardization and platform scalability |
WIN SOURCE offers multiple models of the FSCQ series in original stock, along with technical documentation, selection guidance, and fast BOM matching to help customers accelerate development and improve design efficiency.
The FSCQ1565RTYDTU integrates a high-voltage MOSFET, quasi-resonant control logic, and comprehensive system protection features into a single package, making it an ideal solution for medium-power AC-DC applications. It delivers outstanding performance in system architecture optimization, energy efficiency compliance, and mass production reliability. For engineering teams and procurement professionals involved in legacy platform maintenance, compatibility validation, or seeking in-stock alternatives, the FSCQ1565RTYDTU remains a valuable and applicable choice.
To explore more component specifications, packaging models, and inventory availability, please visit the WIN SOURCE official website.
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