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SN6505A
Low-noise, 1-A, 160-kHz transformer driver with soft start for isolated power supplies
Data sheet
SN6505A
- 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 R ON 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 include s 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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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | SN6505x Low-Noise 1-A Transformer Drivers for Isolated Power Supplies datasheet (Rev. I) | PDF | HTML | 09 Aug 2023 |
| Product overview | 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 | |
| Application brief | How to Isolate Signal and Power for an RS-485 System (Rev. C) | PDF | HTML | 25 May 2021 | |
| Application brief | How to Isolate Signal and Power in Isolated CAN Systems (Rev. C) | PDF | HTML | 25 May 2021 | |
| Application brief | How to Isolate Signal and Power for I2C (Rev. B) | PDF | HTML | 19 May 2021 | |
| Application note | Isolated CAN Reference Design (Rev. E) | 22 Jul 2020 | ||
| Application note | Signal and Power Isolation with 3.3 V / 5 V Input and 12 V / 15 V Output | 17 Oct 2018 | ||
| EVM User's guide | SN6505A and SN6505B Evaluation Module User's Guide | 10 Dec 2015 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
SN6505AEVM — SN6505A low-noise 1-A transformer driver for isolated power supplies evaluation module (160-kHz CLK)
The evaluation module (EVM), featuring the SN6505A 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
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.
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-010065 — High-efficiency, low-emission, isolated DC/DC converter-based analog input module reference design
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 (...)
Reference designs
TIDA-01590 — Reference Design for 1200V Isolated I2C High Side Current Sensing for Solar Combiner Boxes
This reference design is an isolated high-side current sensing design for a smart combiner box in a grounded or ungrounded system. The current sensing topology enables multichannel, sub ±1% error, isolated current sensing for high-voltage systems up to 1200-VDC, limited by the DC/DC (...)
Reference designs
TIDA-00732 — 18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate
This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate” illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:
- Maximizing sampling rate by minimizing propagation delay introduced by digital (...)
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 6 | View options |
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