Overview
The FAN7631SJX is a pulse-frequency modulation (PFM) controller designed for high-efficiency half-bridge resonant converters. It is manufactured by onsemi and includes a high-side gate drive circuit, an accurate current-controlled oscillator, and various protection functions. The controller utilizes the Zero-Voltage-Switching (ZVS) technique, which significantly reduces switching losses and improves efficiency. Additionally, ZVS minimizes switching noise, allowing for a smaller Electromagnetic Interference (EMI) filter. This component simplifies the design of resonant converters, enhancing productivity and performance.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Junction Temperature | -40 | 130 | °C | |
| Operating Frequency | 600 | kHz | ||
| Gate-Driving Current (Source) | 500 | mA | ||
| Gate-Driving Current (Sink) | 1000 | mA | ||
| Quiescent HVCC Supply Current | 50 | 120 | μA | |
| Quiescent LVCC Supply Current | 100 | 200 | μA | |
| Operating HVCC Supply Current (RMS Value) at 100 kHz | 3.0 | 4.5 | mA | |
| Operating HVCC Supply Current (RMS Value) at 300 kHz | 8 | 10 | mA | |
| Junction-to-Ambient Thermal Impedance | 102 | °C/W |
Key Features
- Variable Frequency Control with 50% Duty Cycle for Half-Bridge Resonant Converter Topologies
- High Efficiency with Zero-Voltage-Switching (ZVS)
- Up to 600 kHz Operating Frequency
- Built-in High-Side Gate Driver
- High Gate-Driving Current: +500 mA / -1000 mA
- Programmable Dead Time with a Resistor
- Pulse Skipping and Burst Operation for Frequency Limit (Programmable) at Light-Load Condition
- Simple Remote On/Off Control with Latch or Auto-Restart (A/R) Using FI or LS Pin
- Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD), and High Precise Line Under Voltage Lockout (LUVLO)
- Level-Change OCP Function During Startup
Applications
- PDP and LCD TVs
- Desktop PCs and Servers
- Video Game Consoles
- Adapters
- Telecom Power Supplies
Q & A
- What is the primary function of the FAN7631SJX?
The FAN7631SJX is a pulse-frequency modulation (PFM) controller for high-efficiency half-bridge resonant converters.
- What is the operating frequency range of the FAN7631SJX?
The operating frequency can go up to 600 kHz.
- What is the gate-driving current capability of the FAN7631SJX?
The gate-driving current is +500 mA for sourcing and -1000 mA for sinking.
- What protection functions are included in the FAN7631SJX?
The protection functions include Over-Voltage Protection (OVP), Overload Protection (OLP), Over-Current Protection (OCP), Abnormal Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD), and High Precise Line Under Voltage Lockout (LUVLO).
- How does the FAN7631SJX reduce switching losses and noise?
The FAN7631SJX uses the Zero-Voltage-Switching (ZVS) technique, which reduces switching losses and noise significantly.
- What types of resonant converter topologies can the FAN7631SJX be applied to?
The FAN7631SJX can be applied to series resonant, parallel resonant, and LLC resonant converters.
- How is the dead time programmed in the FAN7631SJX?
The dead time is programmable using a resistor.
- What is the purpose of the LS pin in the FAN7631SJX?
The LS pin allows for simple remote on/off control with latch or auto-restart (A/R) functionality.
- What is the junction-to-ambient thermal impedance of the FAN7631SJX?
The junction-to-ambient thermal impedance is 102 °C/W.
- In what package is the FAN7631SJX available?
The FAN7631SJX is available in a 16-Lead, Small-Outline Package (SOP).
