CTC DC/DC-CONVERTER

Features:

■7.4mm Low Profile Case,24-Pin DIP Package Style.

■UL94V-0 Package Material

■2:1 Wide Input Range.

■3W Max. Output Regulation.
■No external capacitor needed.
■High efficiency up to 87%.

■Very Low Ripple & Noise 30mVp-p with External Output Capacitor.
■Continuous Short Circuit Protection, Auto-Restarting.

■Internal SMD Construction.

■1000Vdc Isolation

■Operating Temperature Range From -40 to 80°C

■Meet CE EN-60950-1 Certified

Description:

The A3WR series is a range of low profile DC-DC converters offering a single regulated output over a

2:1 input voltage range. 24-pin DIP pinning can be selected. No external capacitor needed.

Offer 3W output power up to 80°C without heat-sink except the 4.5V input voltage range which

is derated to 2.4W .

Selection Guide

P/N

Input Range

Output Voltage

Output Current

Efficiency Typ.

A3WR-053.3

A3WR-0505

A3WR-0509

A3WR-0512

A3WR-0515

4.5 ~ 9VDC

3.3

550mA

500mA

300mA

225mA

180mA

66%

71%

74%

77%

79%

A3WR-123.3

A3WR-1205

A3WR-1209

A3WR-1212

A3WR-1215

9 ~ 18VDC

3.3

600mA

333mA

250mA

200mA

72%

77%

80%

82%

83%

A3WR-243.3

A3WR-2405

A3WR-2409

A3WR-2412

A3WR-2415

18 ~ 36VDC

3.3

600mA

333mA

250mA

200mA

77%

81%

83%

85%

87%

A3WR-483.3

A3WR-4805

A3WR-4809

A3WR-4812

A3WR-4815

36 ~72VDC

3.3

600mA

333mA

250mA

200mA

74%

77%

80%

82%

84%

Electrical Specifications
Input Filter	Capacitor type.
Voltage Set Accuracy		MIN.	TYP.	MAX.
Voltage Set Accuracy			±1%	±2%
Line Regulation	Low line to High line @Max. load		0.05%	0.2%
Load Regulation	10% ~ 100% load		0.1%	0.5%
Ripple & Noise @ 20MHz BW	Without external output capacitor			60mVp-p
Ripple & Noise @ 20MHz BW	With external output capacitor			30mVp-p
Operating Temperature		-40°C		+80°C
Storage Temperature		-50°C		+125°C
Short-Circuit Protection	Continuous
Operating Frequency	100KHz, PFM Pulse Frequency Modulation
Isolation Test Voltage	Tested for 1 second Min.	MIN.	TYP.	MAX.
Isolation Test Voltage	Tested for 1 second Min.	1000Vdc
Isolation Capacity			40pF
Isolation Resistance		1GΩ
Humidity				95%
MTBF ( MIL-HDBK-217F)			10⁶hours

Physical Specifications
Case Material	Non conductive Black Plastic
Potting Material	Epoxy( UL94V-0 )
Weight	7.0g

All specifications valid at nominal input voltage, full load @ 25℃ after warm-up time unless otherwise stated.

Recommended Circuit

Although these converters could work without external capacitor, it is recommended that with external output capacitor Cout which could reduce output ripple & noise under 30mVp-p. The followings are the recommended circuit and values.

Recommended Circuit for Reduced Ripple

Use the low ESR Cout capacitors and

inductor Lin to reduce output ripple and

input inrush current.

Lin	Cout
10uH ~100uH	22uF~100uF/25V

A3WR-05×× Power Derating Curve

Mechanical Dimensions