NZL-300
Transformer Driver for Isolated Power Supplies
Isolated Supply
Transformer Driver
Engineering Samples
Features
- Spread spectrum clocking for lower EMI
- Low Pulse Width Distortion < 1.5ns
- In-rush and magnetic control through pulse-skipping, duty cycle and frequency adjustment
- D1 & D2 up to 30V operation
- Up to 350mA D1 & D2 drive
- 400kHz Free running frequency
- 5-Pin SOT-23 Package (engineering samples in SOIC8)
- Voltage supply range 4.5V to 5.5V
- 2kV ESD Protection
- Wide Temperature Range -55°C to 150°C
Applications
- Push-pull driver for small transformers
- Isolated DCDC power supply
- Isolated power supply for high side driver
- High-Temperature Environments
Description
The NZL-300 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power supplies in isolated interface applications. The device drives a low-profile, center-tapped transformer primary from a 3-5.5V power supply. The secondary can be wound to provide any isolated voltage based on transformer turns ratio. The NZL-300 consists of an oscillator followed by a gate drive circuit that provides the complementary output signals to drive the ground referenced N-channel power switches. The internal logic ensures non-overlapping (break-before-make) and controls duty cycle between the two switches in order to ensure perfect magnetic balance on the transformer. At startup the NZL-300 features inrush and magnetization control by innovative pulse skipping and frequency adjustment. The NZL-300 has reduced EMI signature thanks to its spread spectrum clock. The NZL-300 is available in a small SOT-23 (5L) package, and is specified for operation at temperatures from –55°C to 150°C.
Demo boards with the NZL-300
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EVK01
Isolated high-voltage buck-converter evaluation board.
It highlights the use of VDDTECH’s IZL-100 digital isolator, IZL-200 error amplifier and NZL-300 transformer driver.