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Texas Instruments SN6505A-Q1 | Demoboard PMP22992
Dual 15-V, 120-mA Isolated Bias Power Supply Reference Design Using Buck and Push-Pull Converters
Overview
| Topology | Push-Pull Converter symmetrical isolated |
| Input voltage | 12-15 V |
| Output 1 | 15 V / 0.12 A |
Description
This isolated power supply provides dual +15-V outputs at 120 mA each. This power supply is designed for biasing a MOSFET-based power stage that generates excitation for a separately excited synchronous motor (SSM). This design uses a combination of the LMR50410-Q1 buck pre-regulator and the SN6505-Q1 open-loop transformer driver with spread-spectrum modulation. The wide-input voltage range and flexibility make this a versatile design for wide range of applications where isolated power is necessary. This internal reference design is an alternative to the PMP22760 which uses a single-chip solution based on LM5180-Q1.
Features
- 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:<1uA
- Thermal shutdown
- Small 6-Pin SOT23 (DBV) package
- Soft-start enabled (SN6505A-Q1 and SN6505BQ1) to reduce in-rush current and soft-start disabled (SN6505D-Q1) for fast start-up
Typical applications
- Isolated power supplies for–Traction inverter and motor control–DC/DC converter–Battery management system (BMS)–On-board charger (OBC)
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | ISAT,10%(A) | ISAT,30%(A) | RDC max.(mΩ) | fres(MHz) | IRP,40K(A) | Mount | VIN | VOut1(V) | IOut1(mA) | Type of Insulation | fswitch(kHz) | ∫Udt(Vµs) | NPRI : NSEC | VT(V (AC)) | L(mm) | W(mm) | H(mm) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-MAIA SMT Power Inductor, 4.7 µH, 3.05 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-MAIA SMT Power Inductor | Inductance4.7 µH | Saturation Current @ 10%3.05 A | Saturation Current @ 30%5.75 A | DC Resistance76 mΩ | Self Resonant Frequency22 MHz | Performance Rated Current4 A | MountSMT | – | – | – | – | – | – | – | – | Length4.1 mm | Width4.1 mm | Height2.1 mm | ||||
 | WE-PPTI Push-Pull Transformers, 200 µH, – | Simulation– | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-PPTI Push-Pull Transformers | Inductance200 µH | – | – | – | – | – | MountSMT | Input Voltage 3.3 V (DC) | Output Voltage 112 V | Output Current 1165 mA | Type of InsulationSupplementary | Switching Frequency 200 - 600 | Voltage-µSecond15 Vµs | Turns Ratio1:4 | Insulation Test Voltage2500 V (AC) | Length8.3 mm | Width14.75 mm | Height4.2 mm |