Calculation tool
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.
Similar products you might be interested in
Same functionality with different pin-out to the compared device
Technical documentation
No results found. Please clear your search and try again.
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 (Rev. A) | PDF | HTML | 20 Aug 2024 | |
| 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 | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.