Isolated power and data interface for low-power applications reference design
Description
This reference design provides power and data isolation for low and ultra-low power applications. Generating isolated and non-isolated power rails with a high efficiency and containing a power efficient isolated data interface for three forward- plus one reverse-direction channels. Targeted applications are isolated loop powered 4- to 20-mA transmitters. This design can be adapted to other applications requiring highly-efficient power conversion and isolated data transmission while being powered from sources with a limited current capability.
Features
- Power input 5 VDC: source needs to be current limited to Ultra-low power: isolated data interface5: 16: 130 μA per channel at 10: 100: 1000 kbps3 forward-channels: 1 reverse-channelIsolated 10-mA DC/DC ConverterEfficiency up to 86.5%3.3-V: 10-mA buck converter on non-isolated sideEfficiency up to 93%: VOUT ripple 3.3-V: 10-mA buck converter on isolated sideEfficiency up to 92%: VOUT ripple 3.0-V: 10-mA LDOsIQ = 16 μA @ Iout = 1 mAPSRR > 36 dB at ≤ 200 kHz
Applications
- Temperature transmitter
- Process analytics
- Level transmitter
- Force & torque sensor
- Flow transmitter
- Pressure transmitter
Product Categories
- Power management