Texas Instruments SN6505BDBVR | Demoboard PMP21942

Description

Went Online http://www.ti.com/lit/ug/sluubx2a/sluubx2a.pdfThe SN6505x is a low-noise, low-EMI push-pulltransformer driver, specifically designed for smallform factor, isolated power supplies. It drives lowprofile, center-tapped transformers from a 2.25 V to 5 V DC power supply. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x consists of an oscillator followed by a gate drive circuit that provides thecomplementary output signals to drive groundreferenced N-channel power switches. The device includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switching clock can also be provided externally for accurate placement ofswitcher harmonics, or when operating with multiple transformer drivers. The internal protection features include a 1.7 A current limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry.SN6505x includes a soft-start feature that prevents high inrush current during power up with large load capacitors. SN6505A has a 160 kHz internal oscillatorfor applications that need to minimize emissionswhereas SN6505B has a 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from –55°C to 125°C.

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 (DBV) package
• Soft-start to reduce In-rush current

Typical applications

• Low-noise isolated USB supplies
• Process control / Precision instruments
• Telecom supplies / Radio supplies
• Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low-power LAN / Distributed supplies / Low-noise filament supplies
• Medical instruments

More information

• Datasheet