Overview
The NCP4305DDR2G, produced by onsemi, is a high-performance driver designed to control synchronous rectification MOSFETs in switch-mode power supplies. It is versatile and can be used in various topologies such as DCM or CCM flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC. The device features externally adjustable minimum off-time and on-time blanking periods to mitigate ringing induced by PCB layout and parasitic elements. It also includes a self-synchronization feature to ensure reliable and noiseless operation of the synchronous rectification system. The NCP4305DDR2G utilizes Kelvin connection to the MOSFET for high efficiency at full load and includes a light load detection architecture for high efficiency at light loads.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VCC) | -0.3 to 37.0 | V |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | SOIC-8 | |
| Maximum Driver Output Voltage | 9.0 to 10.5 | V |
| Output Peak Source Current | 4 A | A |
| Output Peak Sink Current | 8 A | A |
| Turn Off Delay from Current Sense Input to Driver | Typically 20 ns | ns |
| Current Sense Pin Capability | Up to 200 V | V |
| Ultrafast Trigger Input | 7 ns | ns |
Key Features
- Precise True Secondary Zero Current Detection with Adjustable Threshold
- Typically 20 ns Turn off Delay from Current Sense Input to Driver
- Zero Current Detection Pin Capability up to 200 V
- Optional Ultrafast (7ns) Trigger Input
- Disable Input
- Adjustable Minimum ON Time and Minimum OFF Time
- Self Synchronization
- 8 A Sink, 4 A Source Drive capability
- Light Load Detection with Modulated Gate Drive
- 4.5 V & 9 V UVLO Options and 36 V(Max)
- GaN Transistor Driving Capability
- Low Startup and Disable Current Consumption
- Maximum Operation Frequency up to 1 MHz
Applications
- High Power Density AC/DC Power Supplies
- Notebook Adapters
- Server Power Supplies
- ATX & All-in-one Power Supplies
- High Density USB Adapters
Q & A
- What is the primary function of the NCP4305DDR2G?
The NCP4305DDR2G is designed to control synchronous rectification MOSFETs in switch-mode power supplies.
- What are the supported topologies for the NCP4305DDR2G?
The device can be used in DCM or CCM flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC topologies.
- How does the NCP4305DDR2G mitigate ringing induced by PCB layout and parasitic elements?
The device features externally adjustable minimum off-time and on-time blanking periods to mitigate ringing.
- What is the significance of the self-synchronization feature in the NCP4305DDR2G?
The self-synchronization feature ensures reliable and noiseless operation of the synchronous rectification system.
- What is the maximum driver output voltage for the NCP4305DDR2G?
The maximum driver output voltage is typically between 9.0 to 10.5 V.
- What is the peak current sink and source drive capability of the NCP4305DDR2G?
The device has an 8 A peak sink current and a 4 A peak source current capability.
- What is the turn-off delay time from the current sense input to the driver?
The turn-off delay time is typically 20 ns.
- What is the current sense pin capability of the NCP4305DDR2G?
The current sense pin can handle up to 200 V.
- Does the NCP4305DDR2G support GaN transistor driving?
- What is the maximum operation frequency of the NCP4305DDR2G?
The maximum operation frequency is up to 1 MHz.
