Overview
The FAN6300AMY, produced by onsemi, is a highly integrated PWM (Pulse Width Modulation) controller designed to enhance the performance of quasi-resonant flyback converters. This controller is part of the FAN6300A/H series, with the FAN6300A version suitable for low-frequency operation (below 100 kHz) and the FAN6300H version for high-frequency operation (up to 190 kHz). The FAN6300AMY features a built-in high-voltage startup circuit, quasi-resonant operation, and a proprietary green-mode function to minimize standby power consumption and improve light-load efficiency.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Min | 10 | V |
| Supply Voltage Max | 25 | V |
| No. of Pins | 8 | Pins |
| IC Case / Package | SOIC | |
| IC Mounting | Surface Mount | |
| Switching Frequency Max | 100 | kHz |
| Operating Temperature Min | -40 | °C |
| Operating Temperature Max | 125 | °C |
| Topology | Flyback | |
| Control Mode | Current Mode Control |
Key Features
- High-Voltage Startup: Built-in HV startup circuit to reduce startup time.
- Quasi-Resonant Operation: Ensures operation across a wide range of line voltage and load conditions.
- Green-Mode Function: Off-time modulation to decrease switching frequency and minimize standby power consumption.
- Cycle-by-Cycle Current Limiting: Ensures fixed-peak current limit level even during short circuits.
- Peak-Current-Mode Control: Regulates output voltage and provides pulse-by-pulse current limiting.
- Leading-Edge Blanking (LEB): Prevents false triggering due to leakage inductance ringing.
- Internal Minimum tOFF Time: Limits the system frequency to prevent it from being too high.
- Internal 5 ms Soft-Start: Gradual startup to prevent inrush current.
- Over Power Compensation: Adjusts the current limit based on the load conditions.
- GATE Output Maximum Voltage: Clamped at 18 V to protect the power MOSFET.
- Auto-Recovery Over-Current Protection (FB Pin): Disables PWM output during over-current conditions and recovers automatically.
- Auto-Recovery Open-Loop Protection (FB Pin): Disables PWM output during open-loop conditions and recovers automatically.
- VDD Pin and Output Voltage (DET Pin) OVP Latched: Enters latch-mode until AC power is removed if OVP is triggered.
Applications
- AC/DC Notebook Adapters: Suitable for power supplies in notebook computers.
- External AC-DC Merchant Power Supplies: Used in various external power supplies.
- Wireless Communications: Applied in power supplies for wireless communication devices.
- DVD and STB (Set-Top Box): Used in power supplies for consumer electronics like DVDs and STBs.
- Open-Frame SMPS (Switch-Mode Power Supplies): Suitable for open-frame power supply designs.
Q & A
- What is the maximum switching frequency of the FAN6300AMY?
The FAN6300AMY operates at a maximum switching frequency of 100 kHz. - What is the purpose of the green-mode function in the FAN6300AMY?
The green-mode function provides off-time modulation to decrease switching frequency and minimize standby power consumption and improve light-load efficiency. - What type of protection does the FAN6300AMY offer against over-current conditions?
The FAN6300AMY offers pulse-by-pulse current limiting and auto-recovery over-current protection. - How does the FAN6300AMY protect against open-loop failures?
The FAN6300AMY disables PWM output immediately if an open-circuit failure occurs in the feedback loop and recovers automatically once the condition is resolved. - What is the operating temperature range of the FAN6300AMY?
The operating temperature range is from -40°C to 125°C. - What is the package type of the FAN6300AMY?
The FAN6300AMY is available in an 8-pin Small Outline Package (SOIC). - How does the FAN6300AMY protect the power MOSFET?
The gate output is clamped at 18 V to protect the power MOSFET from high gate-source voltage conditions. - What is the purpose of the internal valley voltage detector in the FAN6300AMY?
The internal valley voltage detector ensures the power system operates at quasi-resonant operation over a wide range of line voltage and load conditions, reducing switching loss. - How does the FAN6300AMY handle output over-voltage protection?
The FAN6300AMY enters latch-mode until AC power is removed if the DET pin OVP is triggered, protecting against output over-voltage conditions. - What is the recommended decoupling capacitor for the VDD and GND pins?
A 0.1 μF decoupling capacitor is recommended between VDD and GND.
