Product details

Rating Catalog Output current (A) 1 Vin (Min) (V) 2.25 Vin (Max) (V) 5.5 Features Enable, Short-circuit protection, Spread spectrum clocking, Thermal shutdown, Slew-rate control Soft start Yes Operating temperature range (C) -55 to 125 Iout (Max) (A) 1.5 Switching frequency (Min) (kHz) 363 Switching frequency (Max) (kHz) 517 Vout (Max) (V) 16 Switch current limit (Typ) (A) 2 Vout (Min) (V) 0
Rating Catalog Output current (A) 1 Vin (Min) (V) 2.25 Vin (Max) (V) 5.5 Features Enable, Short-circuit protection, Spread spectrum clocking, Thermal shutdown, Slew-rate control Soft start Yes Operating temperature range (C) -55 to 125 Iout (Max) (A) 1.5 Switching frequency (Min) (kHz) 363 Switching frequency (Max) (kHz) 517 Vout (Max) (V) 16 Switch current limit (Typ) (A) 2 Vout (Min) (V) 0
SOT-23 (DBV) 6 5 mm² 2.9 x 1.6
  • 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
  • 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

The SN6505x is a low-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 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 the complementary output signals to drive ground-referenced 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 of switcher 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 oscillator for applications that need to minimize emissions whereas 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.

The SN6505x is a low-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 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 the complementary output signals to drive ground-referenced 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 of switcher 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 oscillator for applications that need to minimize emissions whereas 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.

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Technical documentation

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

ISO5852SDWEVM-017 — Driving and Protection Evaluation Board for SiC and IGBT Power Modules

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Evaluation board

SN6505BEVM — SN6505B low-noise 1-A transformer driver for isolated power supplies evaluation module (420-kHz CLK)

The evaluation module (EVM), featuring a SN6505B transformer driver, also contains a small form-factor transformer, simple rectifier circuit, and voltage regulator that can be used to simulate a complete isolated power-supply system suitable for many applications.

Not available on TI.com
Evaluation board

SN6507DGQEVM — SN6507 evaluation module for low-emissions, 500-mA push-pull isolated power supplies

SN6507DGQEVM allows users to evaluate the performance and features of the SN6507 push-pull isolation transformer driver in an isolated power supply application.

Not available on TI.com
Evaluation board

UCC21710QDWEVM-025 — Driving and protection evaluation board for SiC and IGBT transistors and power modules

The UCC21710QDWEVM-025 is a compact, single channel isolated gate driver board providing drive, bias voltages, protection and diagnostic needed for SiC MOSFET and Si IGBT Power Modules housed in 150 x 62 x 17 mm and 106 x 62 x 30 mm packages. This TI EVM is based on 5.7-kVrms reinforced isolation (...)
Not available on TI.com
Evaluation board

UCC21732QDWEVM-025 — Driving and protection evaluation board for SiC and IGBT transistors and power modules

The UCC21732QDWEVM-025 is a compact, single channel isolated gate driver board providing drive, bias voltages, protection and diagnostic needed for SiC MOSFET and Si IGBT Power Modules housed in 150 x 62 x 17 mm and 106 x 62 x 30 mm packages. This TI EVM is based on 5.7-kVrms reinforced isolation (...)

Not available on TI.com
Evaluation board

UCC21750QDWEVM-025 — Driving and protection evaluation board for SiC and IGBT transistors and power modules

The UCC21750QDWEVM-025 is a compact, single channel isolated gate driver board providing drive, bias voltages, desat feature based protection and diagnostic needed for SiC MOSFET and Si IGBT Power Modules housed in 150 x 62 x 17 mm and 106 x 62 x 30 mm packages. This TI EVM is based on 5.7-kVrms (...)
Not available on TI.com
Daughter card

TMDSFSIADAPEVM — Fast serial interface (FSI) adapter board evaluation module

Faster, cheaper, more robust: achieve 200 Mbps throughput across isolation with new serial communication technology – Fast Serial Interface (FSI)

FSI is a low signal count serial communications peripheral, available on C2000 Real-Time Control Microcontrollers (MCU), which offers low-cost reliable (...)

Not available on TI.com
Support software

SN650X-TRANS-PARAMETER-CALC

SLLC470.ZIP (205486 KB)
lock = Requires export approval (1 minute)
Simulation model

SN6505B IBIS Model

SLLM292.ZIP (11 KB) - IBIS Model
Simulation model

SN6505B PSpice Transient Model (Rev. B)

SLLM301B.ZIP (4 KB) - PSpice Model
Simulation model

SN6505B TINA-TI Startup Reference Design

SLLM322.TSC (2495 KB) - TINA-TI Reference Design
Simulation model

SN6505B TINA-TI Steady Reference Design

SLLM323.TSC (2466 KB) - TINA-TI Reference Design
Simulation model

SN6505B TINA-TI Transient Spice Model

SLLM324.ZIP (40 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
Many TI reference designs include the SN6505B

Use our reference design selection tool to review and identify designs that best match your application and parameters.

Package Pins Download
SOT-23 (DBV) 6 View options

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