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Texas Instruments LM25017 | Demoboard RD006
3W Isolated Bias Supply for Communication Interfaces and Measurement Systems
Overview
| Topology | Buck Converter |
| Input voltage | 18-32 V |
| Output 1 | 5.19 V / 0.3 A |
| Output 2 | 4.93 V / 0.3 A |
| Output 3 | 5.25 V / 0.3 A |
| IC revision | a |
Description
This reference design presents an auxiliary supply with two output voltage rails of 5 V, galvanically-isolated from each other, with a combined maximum output power of up to 3 W (i.e. 0.3 A output current per rail). Tightly regulated, lower voltage rails like 3.3 V, 2.5 V or 1.2 V can be easily obtained by cascading a low-dropout linear voltage regulator (a.k.a. LDO) to the required output rail. The design targets applications like isolated communication interfaces and data acquisition systems, as well as many systems using sensors, voltage-level-shifters, digital isolators, or opto-couplers, amongst others.
Features
- Extremely compact (20 x 20 x 5.3) (L x W x H) (mm)
- Wide input voltage range from 18 to 32 V
- Primary output voltage: 5.1 V ± 1%
- Secondary output voltage (balanced load): 4.8 V ± 5%
- Secondary output voltage (unbalanced load): 4.8 V ± 10%
- Output power up to 3 W
- Peak efficiency of 82 %
- LM25017 IC Controller (Texas Instruments)
- WE-TDC-HV Coupled Inductor with 2 kV Isolation
- Buck converter with additional isolated output topology
Typical applications
- 3W Isolated Bias Supply
- Sensor and actuator systems
- Isolated Signal and Communication Interfaces
More information
Products
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | Operating Temperature | L1 (µH) | L2 (µH) | n | IR (A) | IR 2 (A) | ISAT1 (A) | ISAT2 (A) | RDC1 typ (mΩ) | RDC2 typ (mΩ) | RDC1 max (mΩ) | RDC2 max (mΩ) | fres 1 (MHz) | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | 885342208024 | SPEC | 7 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSMH Mid and High Voltage | 1 nF | ±10% | 2000 | 1206 | -55 °C up to +125 °C | 2.5 | 10 GΩ | X7R Class II | 3.2 | 1.6 | 1.6 | 0.6 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 885012206087 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 4.7 nF | ±10% | 50 | 0603 | – | 2.5 | 10 GΩ | X7R Class II | 1.6 | 0.8 | 0.8 | 0.4 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012206065 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 25 V(DC) | 10 nF | ±10% | 25 | 0603 | – | 3.5 | 10 GΩ | X7R Class II | 1.6 | 0.8 | 0.8 | 0.4 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012206095 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 100 nF | ±10% | 50 | 0603 | – | 3 | 5 GΩ | X7R Class II | 1.6 | 0.8 | 0.8 | 0.4 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012206121 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 330 nF | ±10% | 50 | 0603 | -55 °C up to +125 °C | 10 | 1.5 GΩ | X7R Class II | 1.6 | 0.8 | 0.8 | 0.4 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012207023 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 10 V(DC) | 1.5 µF | ±10% | 10 | 0805 | – | 5 | 0.3 GΩ | X7R Class II | 2 | 1.25 | 1.25 | 0.5 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012209048 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 50 V(DC) | 4.7 µF | ±10% | 50 | 1210 | – | 5 | 0.02 GΩ | X7R Class II | 3.2 | 2.5 | 2.5 | 0.6 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
| 885012208019 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WCAP-CSGP MLCCs 10 V(DC) | 22 µF | ±10% | 10 | 1206 | – | 10 | 0.005 GΩ | X7R Class II | 3.2 | 1.6 | 1.6 | 0.5 | 7" Tape & Reel | -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | ||
 | 76889440330 | SPEC | 8 files | Active i| Production is active. Expected lifetime: >10 years. | WE-TDC HV SMT Coupled Inductor | – | – | 250 | 8038 | -40 °C up to +125 °C | – | – | – | 8 | 8 | 3.8 | – | – | -40 °C up to +125 °C | 33 | 33 | 1:1 | 0.85 | 0.85 | 1.85 | 1.85 | 575 | 575 | 640 | 640 | 14 |
| Order Code | Datasheet | Simulation | |
|---|---|---|---|
| 885342208024 | SPEC | |
| 885012206087 | SPEC | |
| 885012206065 | SPEC | |
| 885012206095 | SPEC | |
| 885012206121 | SPEC | |
| 885012207023 | SPEC | |
| 885012209048 | SPEC | |
| 885012208019 | SPEC | |
| 76889440330 | SPEC |
| Samples |
|---|
| Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR (V (DC)) | Size | Operating Temperature | DF (%) | RISO | Ceramic Type | L (mm) | W (mm) | H (mm) | Fl (mm) | Packaging | Operating Temperature | L1 (µH) | L2 (µH) | n | IR (A) | IR 2 (A) | ISAT1 (A) | ISAT2 (A) | RDC1 typ (mΩ) | RDC2 typ (mΩ) | RDC1 max (mΩ) | RDC2 max (mΩ) | fres 1 (MHz) | Samples |
|---|