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SN6505B

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Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

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Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies

SN6505B

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Product details

Parameters

Rating Catalog Iout (A) 1 Vout (Max) (V) 16 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) 100 Switching frequency (Max) (kHz) 1600 Vout (Min) (V) 0 Switch current limit (Typ) (A) 2 open-in-new Find other Transformer drivers

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 open-in-new Find other Transformer drivers

Features

  • 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

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Description

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

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Type Title Date
* Datasheet SN6505x Low-Noise 1-A Transformer Drivers for Isolated Power Supplies datasheet (Rev. H) Apr. 18, 2019
Application notes How to Isolate Signal and Power in Isolated CAN Systems (Rev. A) Apr. 06, 2020
Application notes Isolated CAN Reference Design (Rev. D) Apr. 06, 2020
Technical articles What the DIN VDE V 0884-11:2017-01 standard means for your isolated designs Feb. 27, 2020
Technical articles Isolation 101: How to find the right isolation solution for your application Feb. 11, 2020
Technical articles Why signal isolation matters in 48-V HEV/EV systems Nov. 20, 2019
Technical articles Solving lifetime and temperature challenges in AC motor drives with capacitive-based isolation Nov. 01, 2019
Application notes Isolated power supply, low-noise circuit: 5V, 100mA (Rev. A) Mar. 07, 2019
Application notes Signal and Power Isolation with 3.3 V / 5 V Input and 12 V / 15 V Output Oct. 17, 2018
Application notes How to isolate signal and power for an RS-485 system (Rev. B) Oct. 16, 2018
Application notes How to isolate signal and power for I2C (Rev. A) Oct. 02, 2018
User guides ISO5852SDW Driving and Protecting SiC and IGBT Power Modules May 24, 2018
User guides SN6505A and SN6505B Evaluation Module User's Guide Dec. 10, 2015

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$149.00
Description

The ISO5852SDWEVM-017 is a compact, dual chanel isolated gate driver board providing drive, bias voltages, protection and diagnostic needed for half-bridge Sic MOSFET and IGBT Power Modules in standard 62-mm package. This TI EVM is based on 5.7-kVrms reinforced isolation driver IC ISO5852SDW in (...)

Features
  • 20-A peak, split output drive current with programmable drive voltages
  • Two 5-kVrms reinforced isolated channels to support up to 1700 V input rail
  • Short circuit protection with soft turn OFF and 2-A Miller clamp ability
  • Robust noise-immune solution with CMTI > 100 V/ns
  • Isolated module temperature and (...)
View details
EVALUATION BOARDS Download
document-generic User guide
$49.00
Description

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.

Features
  • Low-noise 1-A transformer driver for isolated power supplies, 420-kHz internal clock
  • 5-V input, 5-V output isolated power
  • Simple rectifier circuit along with low droput (LDO) regulator gives rectified voltage of 5 V
  • Provision for feeding external clock to the device
  • EVM tested for device functionality (...)
View details
EVALUATION BOARDS Download
document-generic User guide
$89.00
Description
The fast serial interface (FSI) adapter board is hardware that helps in understanding the functionality of the FSI peripheral and evaluate it in different system use cases, such as industrial drives, servo, or sensing network topologies. The FSI adapter board supports several on-board reference (...)
Features

Hardware Features

  • TMDSFSIADAPEVM fast serial interface (FSI) adapter board evaluation module is compatible with various controlCARDs, LaunchPads, and other FSI enabled EVMs
  • Digitial Isolation using ISO7763
  • LVDS and RS485 differential transceivers
  • RJ45 connectors to enable the connection of networkable (...)
View details
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description
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 (...)
Features
  • 10-A peak, split output drive current with programmable drive voltages
  • Two 5.7-kVrms reinforced isolated channels to support up to 1700 V input rail
  • Short circuit protection with soft turn OFF and Miller clamp with internal FET
  • Robust noise-immune solution with CMTI > 100 V/ns
View details
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description

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 (...)

Features
  • 10-A peak, split output drive current with programmable drive voltages
  • Two 5.7-kVrms reinforced isolated channels to support up to 1700 V input rail
  • Short circuit protection with two-level soft turn OFF and Miller clamp drive signal for external FET
  • Robust noise-immune solution with CMTI > 100 V/ns
View details
EVALUATION BOARDS Download
document-generic User guide
$199.00
Description
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 (...)
Features
  • 10-A peak, split output drive current with programmable drive voltages
  • Two 5.7-kVrms reinforced isolated channels to support up to 1700 V input rail
  • Short circuit protection using desat signal with soft turn OFF and Miller clamp with internal FET
  • Robust noise-immune solution with CMTI > 100 V/ns
View details

Design tools & simulation

SIMULATION MODELS Download
SLLM292.ZIP (11 KB) - IBIS Model
SIMULATION MODELS Download
SLLM301A.ZIP (652 KB) - PSpice Model
SIMULATION MODELS Download
SLLM322.TSC (2495 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLLM323.TSC (2466 KB) - TINA-TI Reference Design
SIMULATION MODELS Download
SLLM324.ZIP (40 KB) - TINA-TI Spice Model
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI — 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 (...)
document-generic User guide

Reference designs

REFERENCE DESIGNS Download
10kW 3-Phase 3-Level Grid Tie Inverter Reference Design for Solar String Inverter
TIDA-01606 — This verified reference design provides an overview on how to implement a three-level three-phase SiC based DC:AC grid-tie inverter stage.Higher switching frequency of 50KHz reduces the size of magnetics for the filter design and enables higher power density. The use of SiC MOSFETs with switching (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High accuracy analog input module reference design with 16-bit 1-MSPS dual simultaneous-sampling ADC
TIDA-01576 — This reference design accurately measures 16-channel AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range. This range covers protection and measurement requirements (including sampling requirements as per IEC 61850-9-2), which simplifies system design and improves (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design
TIDA-010065 — This reference design is a simplified architecture for generating an isolated power supply for isolated amplifiers for measuring isolated voltages and currents. A fully integrated DC/DC converter with reinforced isolation operating from a 5-V input with configurable 5-V or 5.4-V output (headroom for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Efficiency and High Power Density 1kW Resonant Converter Reference Design with TI HV GaN FET
PMP20637 — This reference design is a high efficiency, high power density and light weight resonant converter reference design. It converts a 390V input to a 48V/1kW output. The PMP20637 power stage has over 140W/in^3 power density. The whole board weight is less than 210g. With fixed 950kHz switching (...)
document-generic Schematic document-generic User guide
Design files
View details
REFERENCE DESIGNS Download
Size and Cost Optimized Binary Module Reference Design Using Digital Isolator with Integrated Power
TIDA-00847 — The TIDA-00847 TI design showcases space and cost optimized architecture for a 4 channel DC input binary module  with improved measurement accuracy and status indication using only two TI products simplifying system design. MCU based binary module improves measurement resolution of binary input (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Bi-directional, dual active bridge reference design for level 3 electric vehicle charging stations
TIDA-010054 — This reference design provides an overview on the implementation of a single-phase dual active bridge (DAB) DC/DC converter. DAB topology offers advantages like soft-switching commutations, a decreased number of devices and high efficiency. The design is beneficial where power density, cost, weight (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Isolated power architecture reference design for communication and analog input/output modules
TIDA-00300 — This reference design provides a simple means through which to isolate I2C or SPI type communication lines. This is often required in Grid Infrastructure applications such as, protertion relays and circuit breakers, where high voltages are involved. This reference design provides the complete (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
High Accuracy Analog Front End Using 16-Bit SAR ADC with ±10V Measurement Range Reference Design
TIDA-00834 — The TIDA-00834 reference design accurately measures voltage and current inputs using simultaneously sampled, 16-bit, ±10 V, bipolar input SAR ADC critical to identify power systems malfunction and power quality related failures accurately and quickly. This results in reduced power systems (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
6.6 kW, bi-directional CLLLC resonant converter reference design using PCB winding transformer
PMP21999 — This 6.6 kW, bi-directional, dual-active-bridge resonant converter reference design allows 380 VDC to 600 VDC input and 280 VDC to 450 VDC output. PCB winding transformer and Rogowski coil synchronous rectifier (SR) control are applied in this design for power density and efficiency optimization. A (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
3.5W isolated push-pull reference design for auxiliary power supply
PMP30555 — This reference design is an isolated open-loop push-pull with “cascode” FETs that finds its typical application in isolated gate drive supply. The cascode connection extends the input voltage range of SN6505B from 5 V to 24 V, and two outputs supply 15 V at 120 mA and 5 V at 350 mA. Its (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Safety isolated secondary SiC MOSFET driver reference design
PMP21561 — This reference design provides an integrated high and low side isolated secondary gate driver solution for an automotive battery charging system incorporating two push-pull SN6505B transformer drivers and the isolated dual-channel gate driver UCC21521C.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Safety isolated primary SiC MOSFET driver reference design
PMP21553 — This reference design provides an integrated high and low side isolated primary gate driver solution for an automotive battery charging system incorporating two push-pull SN6505B transformer drivers and the isolated dual-channel gate driver UCC21521C.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Three-level, three-phase SiC AC-to-DC converter reference design
TIDA-010039 — This reference design provides an overview on how to implement a three-level, three-phase, SiC-based AC/DC converter with bi-directional functionality. A high switching frequency of 50 kHz reduces the size of magnetics for the filter design and as a result a higher power density. SiC MOSFETs with (...)
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REFERENCE DESIGNS Download
Reference Design for Isolated Gate Driver Power Stage with Active Miller Clamp for Solar Inverters
TIDA-00638 — This reference design consists of a single module with a reinforced, isolated IGBT gate driver with a dedicated gate drive power supply. This compact reference design controls IGBTs in solar inverters.  The design uses a reinforced isolated IGBT gate driver with built-in IGBT DESAT detection (...)
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REFERENCE DESIGNS Download
Isolated, High-Accuracy Analog Input Module Reference Design Using 16-Bit ADC and Digital Isolator
TIDA-01214 — This reference design provides accurate measurements of AC voltage and current inputs using a precision 16-bit SAR ADC over a wide input range, covering protection and measurement range (including sampling requirements of IEC 61850-9-2), simplifying system design and improving trip time performance (...)
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REFERENCE DESIGNS Download
2kW, 48V to 400V, >93% Efficiency, Isolated Bidirectional DC-DC Converter Reference Design for UPS
TIDA-00951 — The 2-kW isolated bidirectional DC-DC converter reference design (TIDA-00951) is capable of power transfer between a 400-V DC-BUS and a 12-14 cell lithium battery pack for use in UPS, battery backup and power storage applications. This reference design works as active clamped boost converter with (...)
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REFERENCE DESIGNS Download
Small Form-Factor Reinforced Isolated IGBT Gate Drive Reference Design for 3 Phase Inverter
TIDA-00446 — The TIDA-00446 reference design consists of six reinforced isolated IGBT gate drivers along with dedicated gate drive power supplies. This compact reference design is intended to control IGBT’s in 3-phase inverters like AC drives, uninterruptible power supplies (UPS) and solar inverters. The (...)
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Communication Module Reference Design for Functional Isolated RS-485, CAN and I2C Data Transmission
TIDA-01281 — The TIDA-01281 reference design is low cost, high efficiency, isolated RS-485, I2C & CAN communication module solution intended for use in industrial systems such as Uninterruptable Power Supplies (UPS) and energy storage banks that require isolated communication and isolated power for (...)
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Compact, Half-Bridge, Reinforced Isolated Gate Drive Reference Design
TIDA-01159 — The TIDA-01159 design provides a reference solution for half-bridge isolated gated drivers used in driving power stages of UPS, inverters, server and telecom applications. This TI Design is based on the UCC21520 reinforced insulated gate driver from TI, and is capable of driving MOSFETs and (...)
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±0.5°C 2-Wire Galvanically Isolated IC Temp Sensor with Pulse Count Interface Reference Design
TIDA-00752 — In order to provide system designers a new cost-effective and easy alternative to assured precision temperature measurement, this reference design discusses the new tiny 2-pin digital output IC temperature sensor with single wire pulse count interface that enhances reliability and greatly simplifies (...)
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TI Precision Labs - Isolation: What is CMTI for Digital Isolators?

This video from the TI Precision Labs - Isolation training series introduces common mode transient immunity (CMTI).

Posted: 01-Jan-2020
Duration: 04:01

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