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IC manufacturers Texas Instruments

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Texas Instruments SN6507 | Demoboard SN6507DGQEVM

Low-emission 36-V push-pull transformer driver with duty cycle control for isolated power supplies

Overview

TopologyPush-Pull Converter symmetrical isolated
Input voltage24 V
Switching frequency150-2000 kHz
Output 115 V / 0.5 A
Output 2-15 V / 0.5 A

Description

The SN6507 is a high voltage, high frequency pushpull transformer driver providing isolated power in a small solution size. The device comes with the pushpull topology’s benefits of simplicity, low EMI, and flux cancellation to prevent transformer saturation. Further space savings are achieved through dutycycle control, which reduces component count for wide-input ranges, and by selecting a high switching frequency, reducing the size of the transformer.The device integrates the controller and two 0.5-A NMOS power switches that switch out of phase. Its input operating range is programmed with precision undervoltage lockouts. The device is protected from fault conditions by over-current protection (OCP), adjustable under-voltage lockout (UVLO), over voltage lockout (OVLO), thermal shutdown (TSD), and break-before-make circuitry.The programmable Soft Start (SS) minimizes inrush currents and provides power supply sequencing for critical power up requirements. Spread Spectrum Clocking (SSC) and pin-configurable scalable Slew Rate Control (SRC) further reduces emissions for ultra-low EMI requirements.The SN6507 is available in a 10-pin HVSSOP DGQ 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: 3 V to 36 V– 60 V input voltage tolerance– Duty-cycle control for line regulation
  • 0.5 A switches with programmable current limit
  • Wide switching frequency range: 150 kHz to 2MHz– Allows small-size transformers– Programmable switching frequency– External clock synchronization option
  • Ultra-low noise and EMI– Symmetric push-pull topology– Spread sprectrum clocking– Pin-configurable slew-rate control
  • Protection Features– Adjustable under voltage lockout (UVLO)– Programmable over-current protection (OCP)– Over voltage lockout (OVLO)– Thermal shutdown (TSD)
  • Wide temperature range: –55°C to 125°C
  • Programmable soft-start to reduce In-rush current
  • 10-Pin HVSSOP (DGQ) package with thermal pad

Typical applications

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