Low-noise, 1-A, 420-kHz transformer driver with soft start for isolated power supplies
Product details
Parameters
Package | Pins | Size
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.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
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 (...)
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 (...)
Description
Faster, cheaper, more robust: achieve 200 Mbps throughput across isolation with new serial communication technology – Fast Serial Interface (FSI)
FSI is a low signal count serial communications peripheral, available on C2000 Real-Time Control Microcontrollers (MCU), which offers low-cost reliable (...)
Features
Description
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
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
Description
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
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 6 | View options |
Ordering & quality
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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