Overview
The FAN6921MRMY, produced by onsemi, is a highly integrated electronic component that combines a Power Factor Correction (PFC) controller and a Quasi-Resonant PWM controller. This integration allows for a cost-effective design with fewer external components. The controller is designed to provide regulated DC output voltage and natural power factor correction using a controlled on-time technique. It also features an innovative THD optimizer to reduce input current distortion, enhancing THD performance. The FAN6921MRMY is available in a 16-pin small outline package (SOP) and operates over a wide temperature range from -40°C to 105°C.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Temperature Range | -40 | 105 | °C | |
| Switching Frequency | 440 | Hz | ||
| VDD Turn-On Threshold Voltage | 16.5 | 18.0 | 19.5 | V |
| VDD PWM Off Threshold Voltage | 9 | V | ||
| PFC Maximum On Time | 22 | 25 | 28 | μs |
| PFC Gate Output Clamping Voltage | 14.0 | 15.5 | 17.0 | V |
| Internal Over-Temperature Shutdown | 140 | °C |
Key Features
- Integrated PFC and Flyback Controller
- Critical Mode PFC Controller with Zero-Current Detection
- Quasi-Resonant Operation for PWM Stage
- Internal Minimum tOFF 8 μs for QR PWM Stage
- Internal 10 ms Soft-Start for PWM
- Brownout Protection
- High/Low Line Over-Power Compensation
- Auto-Recovery Over-Current Protection
- Auto-Recovery Open-Loop Protection
- Externally Latch Triggering (RT Pin)
- Adjustable Over-Temperature Latched (RT Pin)
- VDD Pin and Output Voltage OVP (Latched)
Applications
- AC/DC Notebook Adapters
- Open-Frame Switch Mode Power Supplies (SMPS)
- Battery Chargers
Q & A
- What is the operating temperature range of the FAN6921MRMY?
The operating temperature range is from -40°C to 105°C.
- What is the switching frequency of the FAN6921MRMY?
The switching frequency is approximately 440 Hz.
- What type of package does the FAN6921MRMY come in?
The FAN6921MRMY is available in a 16-pin small outline package (SOP).
- What protection features does the FAN6921MRMY offer?
The controller includes secondary-side open-loop and over-current protection with auto recovery, adjustable over-temperature protection, internal over-temperature shutdown, VDD pin OVP, and DET pin over-voltage protection.
- How does the THD optimizer in the FAN6921MRMY work?
The THD optimizer reduces input current distortion at zero-crossing duration to improve THD performance.
- What is the purpose of the RANGE pin in the FAN6921MRMY?
The RANGE pin’s impedance changes according to the VIN pin voltage level, helping in brown-in/out protections and adjusting the controller's operation based on input voltage levels.
- How does the zero-current detection (ZCD) function work in the FAN6921MRMY?
The ZCD pin detects the zero-current condition of the PFC inductor by sensing the voltage signal from an auxiliary winding, which triggers a new PFC switching cycle.
- What are some common applications of the FAN6921MRMY?
Common applications include AC/DC notebook adapters, open-frame SMPS, and battery chargers.
- What is the internal over-temperature shutdown threshold of the FAN6921MRMY?
The internal over-temperature shutdown threshold is 140°C.
- Does the FAN6921MRMY support soft-start functionality?
Yes, it includes an internal 10 ms soft-start for PWM.
