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Texas Instruments SN6507 | Demoboard SN6507DGQEVM
Low-emission 36-V push-pull transformer driver with duty cycle control for isolated power supplies
Overview
| Topology | Push-Pull Converter symmetrical isolated |
| Input voltage | 24 V |
| Switching frequency | 150-2000 kHz |
| Output 1 | 15 V / 0.5 A |
| Output 2 | -15 V / 0.5 A |
Description
The SN6507 is a high voltage, high-frequency push-pull transformer driver providing isolated power in a small solution size. The device comes with the push-pull topology’s benefits of simplicity, low EMI, and flux cancellation to prevent transformer saturation. Further space savings are achieved through duty cycle control, which reduces component count for wide-input ranges, and by selecting a high switching frequency, reducing the size of the transformer. The device integrates the controller and two 0.5-A NMOS power switches that switch out of phase. Its input operating range is programmed with precision Undervoltage lockouts. The device is protected from fault conditions by over-current protection (OCP), adjustable under-voltage lockout (UVLO), over-voltage lockout (OVLO), thermal shutdown (TSD), and break-before-make circuitry. The programmable Soft Start (SS) minimizes inrush currents and provides power supply sequencing for critical power-up requirements. Spread Spectrum Clocking (SSC) and pin-configurable scalable Slew Rate Control (SRC) further reduce emissions for ultra-low EMI requirements. The SN6507 is available in a 10-pin HVSSOP DGQ package. The device operation is characterized for a temperature range from –55°C to 125°C.
Features
- Push-pull driver for transformers
- Wide input voltage range: 3 V to 36 V
- 60 V input voltage tolerance
- Duty-cycle control for line regulation
- 0.5 A switches with programmable current limit
- Wide switching frequency range: 150 kHz to 2 MHz
- Allows small-size transformers
- Programmable switching frequency
- External clock synchronization option
- Ultra-low noise and EMI
- Symmetric push-pull topology
- Spread sprectrum clocking
- Pin-configurable slew-rate control
- Protection Features
- Adjustable under voltage lockout (UVLO)
- Programmable over-current protection (OCP)
- Over voltage lockout (OVLO)
- Thermal shutdown (TSD)
- Wide temperature range: –55°C to 125°C
- Programmable soft-start to reduce In-rush current
- 10-Pin HVSSOP (DGQ) package with thermal pad
Typical applications
- Motor drives: IGBT and SiC gate-driver supplies, Isolated power supply for CAN, RS-485, RS-422, RS-232, SPI, I2C, low-power LAN
- Solar inverters, protection relays, Factory automation, Building automation
- Medical instruments
More information
All technical functions in detail
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IRP,40K(A) | ISAT,30%(A) | RDC typ.(mΩ) | fres(MHz) | VOP(V) | Mount | VIN | VOut1(V (DC)) | IOut1(mA) | Type of Insulation | fswitch(kHz) | ∫Udt(Vµs) | NPRI : NSEC | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Z @ 100 MHz(Ω) | Zmax(Ω) | Test Condition Zmax | IR 2(mA) | RDC max.(mΩ) | Type | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAPI SMT Power Inductor, 33 µH, 0.7 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAPI SMT Power Inductor | Inductance33 µH | Performance Rated Current0.7 A | Saturation Current @ 30%1.7 A | DC Resistance1210 mΩ | Self Resonant Frequency10 MHz | Operating Voltage80 V | MountSMT | – | – | – | – | – | – | – | – | Length3 mm | Width3 mm | Height1.5 mm | – | – | – | – | DC Resistance1330 mΩ | – | ||||
 | WE-PPTI Push-Pull Transformers, 500 µH, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PPTI Push-Pull Transformers | Inductance500 µH | – | – | – | – | – | MountSMT | Input Voltage 24 V (DC) | Output Voltage 115 V (DC) | Output Current 1400 mA | Type of InsulationFunctional | Switching Frequency 400 - 600 | Voltage-µSecond36 Vµs | Turns Ratio1.4:1 | Insulation Test Voltage2500 V (AC) | Length8.5 mm | Width13.12 mm | Height5.5 mm | – | – | – | – | – | – | |||
 | WE-CBF SMT EMI Suppression Ferrite Bead, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-CBF SMT EMI Suppression Ferrite Bead | – | – | – | – | – | – | MountSMT | – | – | – | – | – | – | – | – | Length1.6 mm | Width0.8 mm | Height0.8 mm | Impedance @ 100 MHz1000 Ω | Maximum Impedance1050 Ω | Maximum Impedance120 MHz | Rated Current 2830 mA | DC Resistance300 mΩ | TypeWide Band |