Overview
The NCP4318BLCDR2G is an advanced synchronous rectifier (SR) controller designed by onsemi for use in LLC resonant converters. This device is optimized to operate with minimal external components and features two independent gate driver stages for driving the SR MOSFETs that rectify the outputs of the secondary transformer windings. The NCP4318BLCDR2G incorporates advanced adaptive dead time control and a mixed-mode SR turn-off control algorithm to ensure stable SR operation across the entire load range, thereby maximizing system efficiency.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD Power Supply Input Pin Voltage | -0.3 | 37 | V | |
| VD1, VD2 Drain Sense Input Pin Voltage | -4 | 200 | V | |
| VGATE1, VGATE2 Gate Drive Output Pin Voltage | -0.3 | 17 | V | |
| VS1, VS2 Source Sense Input Pin Voltage | -0.3 | 5.5 | V | |
| TJ Operating Junction Temperature | -40 | 125 | °C | |
| VDD Turn-on Threshold | 4.0 | 4.3 | V | |
| VDD Turn-off Threshold | 3.6 | 3.8 | V | |
| Minimum Switching Frequency | 22 | kHz | ||
| Maximum Switching Frequency | 500 | kHz | ||
| Gate Sourcing Current | 1.5 | A | ||
| Gate Sinking Current | 4.5 | A | ||
| Operating Current in Green Mode | 100 | µA |
Key Features
- Mixed Mode SR Turn-off Control
- Anti Shoot-through Control for Reliable SR Operation
- 200 V-rated Drain Sensing and Dedicated Source Sensing Pins
- Advanced Adaptive Dead Time Control
- SR Current Inversion Detection
- Adaptive Minimum Turn-on Time for Noise Immunity
- SR Conduction Time Increase Rate Limitation
- Multi-level Turn-off Threshold Voltage
- Adaptive Gate Voltage (10 V, 6 V)
- Low Operating Current (100 µA) in Green Mode
- Soft Start with 0 V / 6 V Gate Output Voltage
- Short Turn-on and Turn-off Delay Time (30 ns / 30 ns)
- High Gate Sourcing and Sinking Current (1.5 A / 4.5 A)
- Wide Operating Supply Voltage Range from 6.5 V to 35 V
- Wide Operating Frequency Range (22 kHz to 500 kHz)
- SOIC-8 and SOIC-8 EP Packages
- Pb-Free and RoHS Compliant
Applications
- High Power Density Adapters
- Large Screen LED-TV and OLED-TV Power Supplies
- High Efficiency Desktop and Server Power Supplies
- Networking and Telecom Power Supplies
- High Power LED Lighting
Q & A
- What is the primary function of the NCP4318BLCDR2G?
The NCP4318BLCDR2G is an advanced synchronous rectifier (SR) controller designed for LLC resonant converters, primarily used to drive SR MOSFETs and optimize system efficiency.
- What are the key features of the NCP4318BLCDR2G?
Key features include mixed-mode SR turn-off control, anti shoot-through control, advanced adaptive dead time control, and high gate sourcing and sinking currents.
- What are the operating voltage ranges for the VDD pin?
The VDD pin operates within a voltage range of 6.5 V to 35 V.
- What is the maximum switching frequency supported by the NCP4318BLCDR2G?
The maximum switching frequency is 500 kHz.
- What are the typical gate sourcing and sinking currents of the NCP4318BLCDR2G?
The typical gate sourcing current is 1.5 A, and the typical gate sinking current is 4.5 A.
- What is the operating current in green mode?
The operating current in green mode is 100 µA.
- What are the package options available for the NCP4318BLCDR2G?
The device is available in SOIC-8 and SOIC-8 EP packages.
- Is the NCP4318BLCDR2G Pb-Free and RoHS compliant?
- What are some common applications of the NCP4318BLCDR2G?
- How does the advanced adaptive dead time control work in the NCP4318BLCDR2G?
The advanced adaptive dead time control compensates for the voltage across parasitic inductance to minimize body diode conduction and maximize system efficiency by regulating the dead time within a hysteresis band.
