Product details

Rating Automotive 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 No Operating temperature range (C) -40 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 Automotive 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 No Operating temperature range (C) -40 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
  • 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
More literature Isolated Power Topologies for PLC I/O Modules and Other Low-Power Applications PDF | HTML 09 Nov 2022
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
Application note How to Use Push-Pull Transformer Drivers to Replace Solid-State and Mechanical R PDF | HTML 23 Feb 2020

Design & development

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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.

User guide: PDF
Not available on TI.com
Support software

SN650X-TRANS-PARAMETER-CALC

SLLC470.ZIP (205486 KB)
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Simulation tool

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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-020031 — Automotive 400-V battery to 12-V, 3.6-kW DC/DC converter reference design

This reference design is a 3.6-kW, automotive 400-V to 12-V unidirectional converter which converts the 200-V to 450-V DC input to 12-V, 300-A maximum output. Circuit breaker is applied for overcurrent and overvoltage protection. The converter is designed with SiC MOSFETs on the high voltage side (...)
Design guide: PDF
Schematic: PDF
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SOT-23 (DBV) 6 View options

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