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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
- Isolated Signal and Communication Interfaces
- Sensor and actuator systems
- 3W Isolated Bias Supply
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | C | Tol. C | VR(V (DC)) | Size | Qmin. | DF(%) | RISO | Ceramic Type | L(mm) | W(mm) | H(mm) | Fl(mm) | Packaging | Operating Temperature | Q(%) | 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WCAP-CSMH Mid and High Voltage, 1 nF, ±10% | Downloads8 files | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSMH Mid and High Voltage | Capacitance1 nF | Capacitance±10% | Rated Voltage2000 V (DC) | Size1206 | – | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length3.2 mm | Width1.6 mm | Height1.6 mm | Pad Dimension0.6 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | Q-Factor600 % | – | – | – | – | – | – | – | – | – | – | – | – | |||
| WCAP-CSGP MLCCs 50 V(DC), 4.7 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance4.7 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Q-Factor [1]600 | Dissipation Factor2.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 25 V(DC), 10 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 25 V(DC) | Capacitance10 nF | Capacitance±10% | Rated Voltage25 V (DC) | Size0603 | Q-Factor [1]600 | Dissipation Factor3.5 % | Insulation Resistance10 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 100 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance100 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Q-Factor [1]600 | Dissipation Factor3 % | Insulation Resistance5 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 330 nF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance330 nF | Capacitance±10% | Rated Voltage50 V (DC) | Size0603 | Q-Factor [1]600 | Dissipation Factor10 % | Insulation Resistance1.5 GΩ | Ceramic TypeX7R Class II | Length1.6 mm | Width0.8 mm | Height0.8 mm | Pad Dimension0.4 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 10 V(DC), 1.5 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 10 V(DC) | Capacitance1.5 µF | Capacitance±10% | Rated Voltage10 V (DC) | Size0805 | Q-Factor [1]600 | Dissipation Factor5 % | Insulation Resistance0.3 GΩ | Ceramic TypeX7R Class II | Length2 mm | Width1.25 mm | Height1.25 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 50 V(DC), 4.7 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 50 V(DC) | Capacitance4.7 µF | Capacitance±10% | Rated Voltage50 V (DC) | Size1210 | Q-Factor [1]600 | Dissipation Factor5 % | Insulation Resistance0.02 GΩ | Ceramic TypeX7R Class II | Length3.2 mm | Width2.5 mm | Height2.5 mm | Pad Dimension0.6 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
| WCAP-CSGP MLCCs 10 V(DC), 22 µF, ±10% | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWCAP-CSGP MLCCs 10 V(DC) | Capacitance22 µF | Capacitance±10% | Rated Voltage10 V (DC) | Size1206 | Q-Factor [1]600 | Dissipation Factor10 % | Insulation Resistance0.005 GΩ | Ceramic TypeX7R Class II | Length3.2 mm | Width1.6 mm | Height1.6 mm | Pad Dimension0.5 mm | Packaging7" Tape & Reel | Operating Temperature -55 °C up to +125 °C | – | – | – | – | – | – | – | – | – | – | – | – | – | |||||
 | WE-TDC HV SMT Coupled Inductor, –, – | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TDC HV SMT Coupled Inductor | – | – | Rated Voltage250 V (DC) | Size8038 | – | – | – | – | Length8 mm | Width8 mm | Height3.8 mm | – | – | Operating Temperature -40 °C up to +125 °C | – | Inductance 133 µH | Inductance 233 µH | Turns Ratio1:1 | Rated Current0.85 A | Rated Current 20.85 A | Saturation Current 11.85 A | Saturation Current 21.85 A | DC Resistance 1575 mΩ | DC Resistance 2575 mΩ | DC Resistance 1640 mΩ | DC Resistance 2640 mΩ | Self Resonant Frequency [1]14 MHz |