Product details

Rating Automotive Iout (typ) (A) 1 Vin (min) (V) 2.25 Vin (max) (V) 5.5 Features Enable, Short-circuit protection, Slew-rate control, Spread spectrum clocking, Thermal shutdown Soft start Yes Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable 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 Automotive Iout (typ) (A) 1 Vin (min) (V) 2.25 Vin (max) (V) 5.5 Features Enable, Short-circuit protection, Slew-rate control, Spread spectrum clocking, Thermal shutdown Soft start Yes Operating temperature range (°C) -40 to 125 TI functional safety category Functional Safety-Capable 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 8.12 mm² 2.9 x 2.8
  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • 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
  • Reduced conducted and radiated EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A-Q1) and 420 kHz (SN6505B-Q1 and SN6505D-Q1)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start enabled (SN6505A-Q1 and SN6505B-Q1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up
  • AEC-Q100 (Grade 1) qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C, TA
  • Functional Safety-Capable
  • 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
  • Reduced conducted and radiated EMI
  • Spread spectrum clocking
  • Precision internal oscillator options: 160 kHz (SN6505A-Q1) and 420 kHz (SN6505B-Q1 and SN6505D-Q1)
  • Synchronization of multiple devices with external clock input
  • Slew-rate control
  • 1.7 A Current-limit
  • Low shutdown current: <1 µA
  • Thermal shutdown
  • Small 6-Pin SOT23 (DBV) package
  • Soft-start enabled (SN6505A-Q1 and SN6505B-Q1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up

The SN6505x-Q1 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. Very low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x-Q1 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. SN6505A-Q1 and SN6505B-Q1 include a soft-start feature that prevents high inrush current during power up with large load capacitors. Soft-start feature has been disabled in SN6505D-Q1 for applications that require fast output start-up.SN6505A-Q1 has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1havea 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x-Q1 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from -40°C to 125°C.

The SN6505x-Q1 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. Very low noise and EMI are achieved by slew rate control of the output switch voltage and through Spread Spectrum Clocking (SSC). The SN6505x-Q1 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. SN6505A-Q1 and SN6505B-Q1 include a soft-start feature that prevents high inrush current during power up with large load capacitors. Soft-start feature has been disabled in SN6505D-Q1 for applications that require fast output start-up.SN6505A-Q1 has a 160 kHz internal oscillator for applications that need to minimize emissions whereas SN6505B-Q1 and SN6505D-Q1havea 420 kHz internal oscillators for applications that require higher efficiency and smaller transformer size. The SN6505x-Q1 is available in a small 6-pin SOT23/DBV package. The device operation is characterized for a temperature range from -40°C to 125°C.

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Technical documentation

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Type Title Date
* Data sheet SN6505x-Q1 Low-Noise 1-A Transformer Drivers for Isolated Power Supplies datasheet (Rev. D) 26 Oct 2020
Application note How to Reduce Emissions in Push-Pull Isolated Power Supplies (Rev. A) PDF | HTML 05 Oct 2021
Functional safety information SN6505x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA PDF | HTML 18 Jun 2020
Technical article Streamlining isolated CAN and power interface designs for 48-V HEV systems PDF | HTML 01 May 2020
Technical article Why signal isolation matters in 48-V HEV/EV systems PDF | HTML 20 Nov 2019
Third party documents Simplify Isolated CAN, Power Interfaces for HEV 48-V Systems 16 Jul 2019

Design & development

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

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.

User guide: PDF
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.

User guide: PDF | HTML
Not available on TI.com
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
Calculation tool

SLLC470 SN650X-TRANS-PARAMETER-CALC

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Supported products & hardware

Supported products & hardware

Products
Transformer drivers
SN6501 Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies SN6501-Q1 Automotive low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies SN6505A Low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies SN6505A-Q1 Automotive, low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies SN6505B Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies SN6505B-Q1 Automotive, low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies SN6505D-Q1 Automotive, low-noise, 1-A, 420-kHz transformer driver for isolated power supplies
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 (...)
User guide: PDF
Reference designs

TIDA-020014 — HEV/EV traction inverter power stage with 3 types of IGBT/SiC bias-supply solutions reference design

This reference design presents a traction inverter single-phase power stage with three 12-V car battery inputs, 4.2-W bias supply solutions for hybrid electric vehicle and electric vehicle (HEV/EV) systems. All bias-supply solutions accept a wide input range of 4.5 V to 42 V DC from a 12-V car (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
SOT-23 (DBV) 6 View options

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