SN6505B

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

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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

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 (...)
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 (...)
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 (...)
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
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
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

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

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REFERENCE DESIGNS Download
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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 (...)
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REFERENCE DESIGNS Download
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Design files
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REFERENCE DESIGNS Download
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REFERENCE DESIGNS Download
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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 (...)
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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 (...)
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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.
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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.
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Package Pins Download
SOT-23 (DBV) 6 View options

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