Overview
The FAN7930CMX-G is an active power factor correction (PFC) controller designed by onsemi for boost PFC applications operating in critical conduction mode (CRM). This controller utilizes a voltage-mode PWM and does not require rectified AC line voltage information, thereby reducing power loss associated with input voltage sensing networks. It features a range of protections and control mechanisms to ensure efficient and reliable operation.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Operating Temperature Range | -40 | 125 | °C | |
| Supply Voltage (VCC) | 14 | 14.5 | V | |
| Peak Drive Output Current | -800 | 500 | mA | |
| Maximum Switching Frequency | 250 | 300 | 350 | kHz |
| Under-Voltage Lockout (UVLO) | 2.166 | 2.240 | 2.314 | V |
| Over-Voltage Protection (OVP) Threshold | 2.620 | 2.675 | 2.730 | V |
| Package Type | 8-Lead, Small Outline Package (SOP) | |||
| Storage Temperature Range | -65 | 150 | °C |
Key Features
- PFC-Ready Signal: Triggers other power stages when the PFC output voltage reaches the proper level with hysteresis.
- VIN-Absent Detection: Detects the absence of input voltage to ensure stable operation during power failures.
- Maximum Switching Frequency Limitation: Prevents abnormal CCM operation and inductor current accumulation.
- Internal Soft-Start and Startup without Overshoot: Reduces voltage and current stress at startup and eliminates audible noise.
- Internal Total Harmonic Distortion (THD) Optimizer: Optimizes THD without the need for external resistors.
- Precise Adjustable Output Over-Voltage Protection: Provides adjustable OVP with hysteresis.
- Open-Feedback Protection and Disable Function: Protects against open-feedback conditions and disables the controller if necessary.
- Zero-Current Detector (ZCD): Generates the turn-on signal for the MOSFET.
- MOSFET Over-Current Protection (OCP): Protects the MOSFET from over-current conditions.
- Under-Voltage Lockout with Hysteresis: Ensures the controller operates within a safe voltage range.
- Low Startup and Operating Current: Minimizes power consumption during startup and operation.
- Totem-Pole Output with High State Clamp: Provides high drive current for the MOSFET.
Applications
- Adapter: Suitable for power adapters requiring high power factor correction.
- Ballast: Used in lighting ballasts for efficient power management.
- LCD TV, CRT TV: Employed in television power supplies for improved power factor.
- Switch-Mode Power Supplies (SMPS): Ideal for SMPS applications needing critical conduction mode PFC.
Q & A
- What is the operating temperature range of the FAN7930CMX-G?
The operating temperature range is -40°C to 125°C.
- What is the typical supply voltage for the FAN7930CMX-G?
The typical supply voltage is 14 V, with a maximum of 14.5 V.
- What is the maximum switching frequency of the FAN7930CMX-G?
The maximum switching frequency is up to 350 kHz.
- Does the FAN7930CMX-G have over-voltage protection?
Yes, it has adjustable output over-voltage protection with hysteresis.
- How does the FAN7930CMX-G handle input voltage absence?
The controller detects the absence of input voltage and resets the soft-start to wait for the AC input to be live again.
- What is the purpose of the PFC-Ready signal in the FAN7930CMX-G?
The PFC-Ready signal triggers other power stages when the PFC output voltage reaches the proper level with hysteresis.
- Does the FAN7930CMX-G have internal soft-start and startup without overshoot?
Yes, it features internal soft-start and startup mechanisms to reduce voltage and current stress at startup.
- How does the FAN7930CMX-G optimize total harmonic distortion (THD)?
The controller has an internal THD optimizer that does not require external resistors.
- What kind of protection does the FAN7930CMX-G offer against open-feedback conditions?
The controller has open-feedback protection and can disable itself if necessary.
- What is the package type of the FAN7930CMX-G?
The package type is an 8-Lead, Small Outline Package (SOP).
