Low Power Dc-Dc Converters

© 2012 CUI Inc

Introduction

Purpose Introduction to CUI Inc’s low power dc-dc converters

 

Objectives Selection criteria for 1 W-2 W dc-dc converters

Content: 13 pagesLearning Time: 10 minutes

© 2012 CUI Inc

Criteria to Consider

Inputs/outputs

Power conversion

Isolation

Regulation

Protections

Package

© 2012 CUI Inc

Input Voltage Requirements

Nominal inputvoltage needs

Input ranges:+/-10%2:14:1

Vout+

Vout-

Vin+

Vin-

DC DCSupply Load

Isolation Layer

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Single / Dual

Positive / Negative

Fixed Output

Vout+

Vout-

Vin+

Vin-

DC DCSupply Load

Isolation Layer

© 2012 CUI Inc

Power Conversion

+12V

GND

+5V

GND

DC DC

+5V

GND

+12V

GND

DC DC

Step UpStep Down

GND

-5V

+5V

GND

DC DC

Inversion

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Isolation

Safety

Signal

Vout+

Vout-

Vin+

Vin-

DC DCSupply Load

Isolation Layer

© 2012 CUI Inc

Regulation

Two categories of devices Regulated & Non-regulated

Regulated Used where the input voltage is not well regulated Outputs do not fluctuate with changes in line and load

Non-regulated Where the upstream signal is well regulate and fluctuations will be minimal Narrow input range Outputs fluctuate with line and load changes

© 2012 CUI Inc

Protections

Short circuit

Over voltage

Over current / over load

Under voltage

© 2012 CUI Inc

CUI Parts

1 W Isolated Dc-Dc Converters – Unregulated

seriesinput range

(V dc)output voltage

(V dc) efficiency package

isolation (V dc)

VAT1-SMT 5, 12, 15, 24 5, +/-5, 9, +/-9, 12, +/-12, 15, +/-15 79% 10 pin SMT 1 K

VBT1-SMT 3.3, 5, 12, 15, 24 3.3, 5, 9, 12, 15 83% 8 pin SMT 1 K

VASD1-SIP 5, 12, 15, 24 5, +/-5, 9, +/-9, 12, +/-12, 15, +/-15 81% 7 pin SIP 1 K

VBSD1-SIP 3.3, 5, 12, 15, 24 3.3, 5, 9, 12, 15 81% 4 pin SIP 1 K

VBSD1-DIP 3.3, 5, 12, 15, 24 3.3, 5, 9, 12, 15 81% 8 pin DIP 1 K

VASD1-DIP 5, 12, 15, 24 5, +/-5, 9, +/-9, 12, +/-12, 15, +/-15 80% 6 pin DIP 1 K

VEFT1-SMT 5, 12, 15, 24 5, +/-5, 9, +/-9, 12, +/-12, 15, +/-15 80% 12 pin SMT 3 K

VESD1-SIP 5, 12, 15, 24 5, +/-5, 9, +/-9, 12, +/-12, 15, +/-15 81% 7 pin SIP 3 K

VFSD1-SIP 3.3, 5, 12, 15, 24 3.3, 5, 9, 12, 15 81% 7 pin SIP 3 K

VHS1-SIP 5, 12, 15, 24 5, 9, 12, 15 78% 7 pin SIP 6 K

© 2012 CUI Inc

CUI Parts (continued)

seriesinput range

(V dc)output voltage

(V dc) efficiency package

isolation (V dc)

VIBLSD1-SIP 5, 12, 15, 24 5, 9, 12, 15 73% 7 pin SIP 1 K

VIBLSD1-DIP 5, 12, 15, 24 5, 9, 12, 15 73% 14 pin DIP 1 K

VIBLT1-SMT 5, 12, 15, 24 5, 9, 12, 15 72% 14 pin SMT 1 K

VWRAS1-SIP4.5–9, 9–18, 18–36,

36–72+/-5, +/-9, +/-12, +/-15 83% 8 pin SIP 1.5 K

VWRBS1-SIP4.5–9, 9–18, 18–36,

36–725, 9, 12, 15 83% 8 pin SIP 1.5 K

1 W Isolated Dc-Dc Converters – Regulated

© 2012 CUI Inc

2 W Isolated Dc-Dc Converters – Unregulated

seriesinput range

(V dc)output voltage

(V dc) efficiency package

isolation (V dc)

VAT2-SMT 5, 12 +/-5, +/-9, +/-12, +/-15 85% 10 pin SMT 1 K

VBT2-SMT 5, 12 3.3, 5, 9, 12, 15 85% 8 pin SMT 1 K

VASD2-SIP 5, 12, 15, 24 +/-5, +/-9, +/-12, +/-15 87% 7 pin SIP 1 K

VBSD2-SIP 3.3, 5, 12, 15, 24 3.3, 5, 9, 12, 15 86% 7 pin SIP 1 K

VESD2-SIP 5, 12, 15, 24 +/-5, +/-9, +/-12, +/-15 87% 7 pin SIP 3 K

VFSD2-SIP 5, 12, 24 5, 9, 12, 15 86% 7 pin SIP 3 K

CUI Parts (continued)

© 2012 CUI Inc

seriesinput range

(V dc)output voltage

(V dc) efficiency package

isolation (V dc)

VWRAS2-SIP4.5–9, 9–18, 18–

36, 36–72+/-5, +/-9, +/-12, +/-15 80% 8 pin SIP 1.5 K

VWRBS2-SIP 4.5–9, 9–18, 18–

36, 36–725, 9, 12, 15 83% 8 pin SIP 1.5 K

VWQBS2-SIP 9–36, 18–72 3.3, 5, 9, 12, 15 82% 9 pin SIP 1.5 K

CUI Parts (continued)

2 W Isolated Dc-Dc Converters – Regulated

© 2012 CUI Inc

Summary

There are a number of criteria to consider when selecting a dc-dc converter

CUI offers a broad line up of regulated and unregulated, isolated dc-dc converters

Learn More View CUI’s line of lower power dc-dc converters

View CUI’s full Power product portfolio

www.cui.com