onsemi FAN6300AMY

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.

• 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.

• 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.

1. What is the maximum switching frequency of the FAN6300AMY?
   The FAN6300AMY operates at a maximum switching frequency of 100 kHz.
2. 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.
3. 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.
4. 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.
5. What is the operating temperature range of the FAN6300AMY?
   The operating temperature range is from -40°C to 125°C.
6. What is the package type of the FAN6300AMY?
   The FAN6300AMY is available in an 8-pin Small Outline Package (SOIC).
7. 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.
8. 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.
9. 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.
10. What is the recommended decoupling capacitor for the VDD and GND pins?
    A 0.1 μF decoupling capacitor is recommended between VDD and GND.