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Home > Embedded ICs > Embedded - Microcontroller Unit (MCU) > SN6505BDBVR
Texas Instruments

SN6505BDBVR

SN6505BDBVR

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SN6505BDBVR Overview

The SN6505x is alow-noise, low-EMI push-pull transformer driver, specifically designed for small form factor,isolated power supplies. It drives low-profile, center-tapped transformers from a 2.25 V to5 V DC power supply. Ultra-low noise and EMI are achieved by slew rate control of the output switch voltage and throughSpread Spectrum Clocking (SSC). The SN6505x consists of an oscillator followed by a gate drive circuit thatprovides the complementary output signals to drive ground-referenced N-channel power switches. Thedevice includes two 1-A Power-MOSFET switches to ensure start-up under heavy loads. The switchingclock can also be provided externally for accurate placement of switcher harmonics, or whenoperating with multiple transformer drivers. The internal protection features include a 1.7 Acurrent limiting, under-voltage lockout, thermal shutdown, and break-before-make circuitry.SN6505xincludes a soft-start feature that prevents high inrush currentduring power up with large load capacitors. SN6505A has a 160 kHz internaloscillator for applications that need to minimize emissions whereas SN6505Bhas a 420 kHz internaloscillators for applications that require higher efficiency and smaller transformer size. TheSN6505x is available in asmall 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 voltagerange: 2.25 V to 5.5 V
  • High output drive: 1 A at 5 Vsupply
  • Low RON 0.25 Ω max at 4.5 Vsupply
  • Ultra-low EMI
  • Spread spectrum clocking
  • Precision internal oscillator options:160 kHz (SN6505A) and 420 kHz(SN6505B)
  • Synchronization of multiple devices with external clockinput
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 μA
  • Thermalshutdown
  • Wide temperature range: –55°C to125°C
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start to reduce In-rushcurrent

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Specifications

Circuit Diagram

SN6505BDBVR

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