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SN6505BDBVR

420kHz push-pull transformer driver, 2.25-5.5V, 1A drive, spread-spectrum, SOT-23-6

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Manufacturer Part：

SN6505BDBVR

Package：

SOT-23-6 (2.9 x 2.8 x 1.15 mm)

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Description

Product Overview

The SN6505BDBVR from Texas Instruments is a low-noise, low-EMI push-pull transformer driver designed for isolated power supplies. Operating from 2.25 V to 5.5 V with a 420-kHz internal oscillator, it delivers up to 1 A output drive current in a tiny 6-pin SOT-23 package. The device features spread-spectrum clocking, slew-rate control, and soft-start for ultra-low noise operation.

Key Specifications

Input Voltage Range 2.25 V to 5.5 V
Switching Frequency 420 kHz (typ)
Output Drive Current 1 A at 5 V
RDS(on) 0.25 ohm (max) at 4.5 V
Current Limit 1.7 A (typ)
Operating Temperature -55 to 125 degC
Package SOT-23-6 (2.9 x 2.8 mm)

Features

  • Push-pull driver for center-tapped transformers
  • Spread-spectrum clocking for ultra-low EMI
  • Slew-rate control on output switches
  • Soft-start reduces inrush current
  • External clock synchronization input
  • Thermal shutdown and undervoltage lockout

Applications

  • Isolated RS-485/RS-232/CAN power supplies
  • Medical equipment isolated power
  • Industrial automation isolated rails
  • Smart meter isolated DC-DC
  • EV charging station isolation

The SN6505BDBVR from Texas Instruments is a low-noise, low-EMI push-pull transformer driver specifically designed for small isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25-V to 5.5-V DC source. Ultra-low noise and EMI are achieved through slew-rate control of the output switch voltage and spread-spectrum clocking (SSC). The device integrates an oscillator followed by gate drive circuitry providing complementary output signals to drive ground-referenced N-channel power switches. Two internal 1-A power MOSFET switches ensure reliable startup under heavy load conditions.

The SN6505BDBVR operates as a push-pull converter driver. The internal 420-kHz oscillator generates complementary gate drive signals for two internal N-channel MOSFET switches. Each MOSFET connects the transformer primary winding to ground alternately, creating an AC voltage across the primary. The center-tapped primary is connected to the input supply, and the MOSFETs drive each half-winding in turn. The secondary winding is rectified through diodes to produce the isolated output voltage. Spread-spectrum clocking dithers the switching frequency to reduce peak EMI emissions. Slew-rate control on the output transitions further reduces high-frequency harmonic content. Soft-start gradually increases the duty cycle during startup to limit inrush current.

Pin Name Type Function
1 D1 Output Switch output 1 (drain of MOSFET 1)
2 GND Power Ground
3 D2 Output Switch output 2 (drain of MOSFET 2)
4 VCC Power Input supply voltage
5 EN/CLK Input Enable (active high) / external clock input
6 GND Power Ground
  • Isolated power for RS-485, RS-232, and CAN bus transceivers
  • Medical device isolated power supplies
  • Industrial automation and process control isolated rails
  • Smart meter and energy measurement isolation
  • EV charging communication isolation power
Manufacturer Part Number Package Notes
TI SN6505ADBVR SOT-23-6 160 kHz oscillator version
TI SN6505DDBVR SOT-23-6 2.1 MHz oscillator version
TI SN6501DBVR SOT-23-6 Lower cost, 350 kHz, no SSC
TI LM5050-1SD/NOPB SOT-23-6 OR-ing controller alternative
Maxim MAX253CSA+ SOIC-8 Similar transformer driver
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

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Contact Information

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Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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