Overview
The FAN6921BMRMY, produced by onsemi, is a highly integrated Power Factor Correction (PFC) and Quasi-Resonant PWM controller. This device combines the functions of a critical mode PFC controller and a quasi-resonant current mode PWM controller, enabling a cost-effective design with fewer external components. It features a controlled on-time technique for PFC to achieve a regulated DC output voltage and natural power factor correction. Additionally, the FAN6921BMRMY includes an innovative THD optimizer to reduce input current distortion, enhancing THD performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD Turn-On Threshold Voltage | 16.5 | 18.0 | 19.5 | V |
| VDD Turn-Off Threshold Voltage | 6.5 | 7.5 | 8.5 | V |
| Startup Current | - | - | 30 | μA |
| Operating Current | - | - | 10 | mA |
| PFC Maximum On Time | 22 | 25 | 28 | μs |
| Operating Ambient Temperature | -40 | - | 105 | °C |
| Package | - | - | 16-Pin Small Outline Package (SOP) | - |
Key Features
- Integrated PFC and Flyback Controller
- Critical Mode PFC Controller
- Zero-Current Detection for PFC Stage
- 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)
- Internal Over-Temperature Shutdown (140°C)
Applications
- AC/DC Narrow-Band Adapters
- Open-Frame Switch Mode Power Supplies (SMPS)
- Battery Chargers
Q & A
- What is the primary function of the FAN6921BMRMY?
The FAN6921BMRMY is a highly integrated Power Factor Correction (PFC) and Quasi-Resonant PWM controller.
- What is the package type of the FAN6921BMRMY?
The FAN6921BMRMY is available in a 16-Pin Small Outline Package (SOP).
- What is the operating ambient temperature range for the FAN6921BMRMY?
The operating ambient temperature range is from -40°C to 105°C.
- What protection features does the FAN6921BMRMY include?
The device includes secondary-side open-loop and over-current protection, external latch triggering, adjustable over-temperature protection, VDD pin OVP, and brown-in/out protection.
- How does the FAN6921BMRMY improve THD performance?
The FAN6921BMRMY includes an innovative THD optimizer to reduce input current distortion at zero-crossing duration.
- What is the typical startup current for the FAN6921BMRMY?
The typical startup current is less than 30 μA.
- What is the purpose of the RT pin in the FAN6921BMRMY?
The RT pin is used for adjustable over-temperature protection and external latch triggering.
- How does the FAN6921BMRMY handle zero-current detection for the PFC stage?
The device uses the ZCD pin connected to an auxiliary winding to detect when the PFC inductor current discharges to zero.
- What are some common applications for the FAN6921BMRMY?
Common applications include AC/DC narrow-band adapters, open-frame SMPS, and battery chargers.
- What is the internal over-temperature shutdown temperature for the FAN6921BMRMY?
The internal over-temperature shutdown temperature is 140°C.
