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SN6505B-Q1
Automotive, low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies
Data sheet
SN6505B-Q1
- AEC-Q100 (Grade 1) qualified for automotive applications
- Device temperature grade 1: –40°C to +125°C, TA
- Functional Safety-Capable
- Documentation available to aid functional safety system design: SN6505A-Q1, SN6505B-Q1, SN6505D-Q1
- 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.
Technical documentation
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View all 6 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | SN6505x-Q1 Low-Noise 1-A Transformer Drivers for Isolated Power Supplies datasheet (Rev. D) | 26 Oct 2020 | |
| 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 | |
| Technical article | Streamlining isolated CAN and power interface designs for 48-V HEV systems | PDF | HTML | 01 May 2020 | |
| Technical article | Why signal isolation matters in 48-V HEV/EV systems | PDF | HTML | 20 Nov 2019 | |
| Third party document | Simplify Isolated CAN, Power Interfaces for HEV 48-V Systems | 16 Jul 2019 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
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
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 model
SN6505B TINA-TI Startup Reference Design
SLLM322.TSC (2495 KB) - TINA-TI Reference Design
Simulation model
SN6505B TINA-TI Steady Reference Design
SLLM323.TSC (2466 KB) - TINA-TI Reference Design
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 (...)
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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-020014 — HEV/EV traction inverter power stage with 3 types of IGBT/SiC bias-supply solutions reference design
This reference design presents a traction inverter single-phase power stage with three 12-V car battery inputs, 4.2-W bias supply solutions for hybrid electric vehicle and electric vehicle (HEV/EV) systems. All bias-supply solutions accept a wide input range of 4.5 V to 42 V DC from a 12-V car (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23 (DBV) | 6 | Ultra Librarian |
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