SN6505BDBVR Description

The SN6505BDBVR is a low-noise, low-EMI push-pull transformer driver developed for isolated power supply with a small form factor. It uses a 2.25 V to 5 V DC power source to drive low-profile, center-tapped transformers. Slew rate control of the output switch voltage and Spread Spectrum Clocking is used to achieve ultra-low noise and EMI (SSC). The SN6505BDBVR is made up of an oscillator and a gate drive circuit that generates complementary output signals for driving ground-connected N-channel power switches. To assure start-up under strong loads, the SN6505BDBVR incorporates two 1-A Power-MOSFET switches. For proper placement of switcher harmonics or when working with several transformer drivers, the switching clock can alternatively be given externally.

SN6505BDBVR Features

• Push-pull driver for transformers

• Wide input voltage range: 2.25 V to 5.5 V

• High output drive: 1 A at 5 V supply

• Low RON 0.25 Ω max at 4.5 V supply

• Ultra-low EMI

• Spread-spectrum clocking

• Precision internal oscillator options: 160 kHz (SN6505A) and 420 kHz (SN6505B)

• Synchronization of multiple devices with external clock input

• Slew-rate control

• 1.7 A Current-limit

• Low shutdown current: <1 μA

• Thermal shutdown

• Wide temperature range: –55°C to 125°C

• Small 6-Pin SOT23 (DVB) Package

• Soft-start to reduce In-rush current

SN6505BDBVR Applications

• Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low-power LAN

• Low-noise isolated USB supplies

• Process control

• Telecom supplies

• Radio supplies

• Distributed supplies

• Medical instruments

• Precision instruments

• Low-noise filament supplies