JW1763B
High-efficiency flyback converter with integrated 650V MOSFET for offline power supplies up to 24W
Product Overview
Description
The JW1763B is a high-performance flyback converter controller with integrated 650V power MOSFET, designed for offline power supplies up to 24W. It features current-mode control with built-in slope compensation for stable operation across all load conditions.
The device operates in quasi-resonant mode at heavy loads to minimize switching losses and EMI, transitioning to burst mode at light loads to maintain high efficiency. The switching frequency is internally limited to reduce EMI while optimizing transformer size.
Comprehensive protection features include over-voltage protection, over-current protection with cycle-by-cycle current limiting, overload protection with auto-restart, and thermal shutdown. The JW1763B is available in a compact SOP-8 package, making it ideal for space-constrained adapters and chargers.
Product Series
JW
Primary Application
Power adapters
Key Features
- Integrated 650V power MOSFET
- Quasi-resonant operation for high efficiency
- Burst mode for light load efficiency
- Built-in soft-start function
- Frequency foldback for EMI reduction
- Comprehensive protection features
- Low standby power consumption
- Compact SOP-8 package
Specifications
| Input Voltage Range | 85VAC - 265VAC |
|---|---|
| Output Power | Up to 24W |
| Integrated MOSFET | 650V, 2A |
| Efficiency | Up to 88% |
| Switching Frequency | 65kHz maximum |
| Standby Power | <75mW |
| Operating Temperature | -40°C to +85°C |
| Package | SOP-8 |
Applications
Power adapters
Electronic system design
Battery chargers
Battery and charging management
Auxiliary power supplies
Electronic system design
LED drivers
Motor drive and control systems
Home appliances
Electronic system design
FAE Expert Insights
"The JW1763B is an excellent choice for cost-sensitive offline power supplies. The integrated 650V MOSFET significantly reduces external component count and PCB area. In my experience, the quasi-resonant operation provides measurable efficiency improvements over traditional PWM controllers, typically 3-5% better at full load. The burst mode maintains reasonable efficiency even at 10% load, which is important for meeting modern standby power regulations. One implementation tip: the feedback network design is critical for stability. I recommend using the typical application circuit from the datasheet and adjusting the compensation components based on your specific transformer and output capacitors. The soft-start function works well to prevent transformer saturation during startup. Overall, a reliable and cost-effective solution for sub-25W applications."
Integrated high-voltage MOSFET flyback converter with quasi-resonant operation for high efficiency
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What is the maximum output power of JW1763B?
The JW1763B can deliver up to 24W output power with adequate thermal management. The actual maximum power depends on input voltage range, ambient temperature, and cooling conditions. For universal input (85VAC-265VAC) applications, 18-20W is typical without additional heatsinking.
Up to 24W maximum; 18-20W typical for universal input without heatsink.
What is the efficiency of JW1763B?
The JW1763B achieves up to 88% efficiency under optimal conditions. The quasi-resonant operation minimizes switching losses, while burst mode maintains reasonable efficiency at light loads. Actual efficiency depends on transformer design, output rectifier, and operating conditions.
Up to 88% efficiency; quasi-resonant operation provides best efficiency at medium to heavy loads.
What protection features does JW1763B include?
JW1763B includes comprehensive protection: over-voltage protection on VCC, cycle-by-cycle over-current protection, overload protection with auto-restart, and thermal shutdown. These protections ensure safe operation under fault conditions and prevent damage to the converter and load.
Comprehensive protections suitable for safety-critical applications; auto-restart for overload recovery.
What is the standby power consumption of JW1763B?
The JW1763B achieves less than 75mW standby power consumption at 230VAC input with no load. This low standby power helps meet modern energy efficiency regulations such as DoE Level VI and EU CoC Tier 2.
<75mW standby power meets DoE Level VI and EU CoC Tier 2 requirements.
What transformer design is recommended for JW1763B?
Use a transformer with appropriate turns ratio for your output voltage and current requirements. The primary inductance should be selected based on the desired switching frequency and power level. Follow the design guidelines in the application note for optimal performance. Typical primary inductance ranges from 1mH to 3mH for 10-24W applications.
1-3mH primary inductance typical for 10-24W; follow application note guidelines.
Does JW1763B support synchronous rectification?
The JW1763B is designed for traditional diode rectification on the secondary side. For higher efficiency applications, pair it with the JW7726B synchronous rectifier controller on the secondary side. This combination can improve efficiency by 3-5% compared to diode rectification.
Use JW7726B synchronous rectifier controller for highest efficiency applications.
What is the switching frequency of JW1763B?
The JW1763B operates in quasi-resonant mode with variable switching frequency up to 65kHz maximum. The frequency varies with load and input voltage to maintain valley switching for minimum losses. At light loads, burst mode reduces effective frequency to minimize switching losses.
Variable frequency up to 65kHz; quasi-resonant for valley switching.