Overview
The NCP4306DAHZZAASNT1G, produced by onsemi, is a high-performance secondary side synchronous rectification driver designed for use in switch mode power supplies (SMPS). This IC is tailored to control synchronous rectification MOSFETs in various topologies, including discontinuous conduction mode (DCM), continuous conduction mode (CCM) flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC converters. It features high-speed logic circuitry and a high current gate driver to provide efficiently timed drive signals to the MOSFET, ensuring high efficiency operation across different load conditions.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Supply Voltage | VCC | -0.3 | - | 37.0 | V |
| Operating Junction Temperature | TJ | -40 | - | 125 | °C |
| UVLO Threshold (VCC rising) | VCCON | 3.7 | 4.0 | 4.2 | V |
| UVLO Threshold (VCC falling) | VCCOFF | 3.2 | 3.5 | 3.7 | V |
| Minimum On Time | tON_MIN | 4.50 | 5.00 | 5.50 | μs |
| Minimum Off Time | tOFF_MIN | 4.40 | 4.90 | 5.40 | μs |
| Propagation Delay from CS to DRV Output On | tPD_ON | 30 | 60 | - | ns |
| Propagation Delay from CS to DRV Output Off | tPD_OFF | 13 | 23 | - | ns |
Key Features
- High Performance Driver: Designed to control synchronous rectification MOSFETs with high-speed logic circuitry and a high current gate driver.
- Versatility in Topologies: Compatible with DCM, CCM flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC converters.
- Adjustable Minimum On and Off Times: Allows for external or fixed adjustment of minimum on and off times to mitigate ringing and parasitic effects.
- Self Synchronization: Ensures reliable and noiseless operation of the synchronous rectification system.
- Kelvin Connection: Connection to the MOSFET for high efficiency operation at full load.
- Light Load Detection: Architecture to achieve high efficiency at light load conditions.
- Ultrafast Turn-Off Input: Can be used to turn off the SR MOSFET in CCM applications to improve efficiency.
Applications
- Notebook Adapters: Ideal for high power density AC/DC power supplies.
- High Power Density AC/DC Power Supplies: Suitable for cell phone chargers and other high-efficiency requirements.
- LCD TVs: Used in power supplies for LCD TVs.
- All SMPS with High Efficiency Requirements: Applicable to any switch mode power supply needing high efficiency synchronous rectification.
Q & A
- What is the primary function of the NCP4306DAHZZAASNT1G?
The primary function is to control synchronous rectification MOSFETs in switch mode power supplies (SMPS) to achieve high efficiency.
- What are the supported topologies for the NCP4306?
It supports DCM, CCM flyback, quasi-resonant flyback, forward, and half-bridge resonant LLC converters.
- How does the NCP4306 handle ringing and parasitic effects?
It allows for adjustable minimum on and off times to mitigate these effects.
- What is the purpose of the Kelvin connection in the NCP4306?
The Kelvin connection is used to achieve high efficiency operation at full load by directly connecting the driver to the MOSFET.
- How does the NCP4306 manage light load conditions?
It uses a light load detection architecture to achieve high efficiency at light load conditions.
- What is the ultrafast turn-off input used for in the NCP4306?
The ultrafast turn-off input can be used to turn off the SR MOSFET in CCM applications to improve efficiency.
- What are the typical operating voltage and temperature ranges for the NCP4306?
The operating voltage range is from 4.0 to 35 V, and the operating junction temperature range is from -40 to 125 °C.
- What are some common applications of the NCP4306?
Common applications include notebook adapters, high power density AC/DC power supplies, LCD TVs, and any SMPS requiring high efficiency synchronous rectification.
- What package options are available for the NCP4306?
The NCP4306 is available in TSOP6, SOIC8, DFN8 4x4, and DFN8 2x2.2 packages.
- Is the NCP4306 a Pb-free device?
Yes, the NCP4306 is a Pb-free device.
