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DATASHEET
Rev. A
DH40 SERIES
2:1 Wide Input Voltage Ranges
Single & Dual Outputs, Efficiency up to 92%
2.0” x 1.0” x 0.4” Encapsulated Shielded Metal Package
40 Watt DC/DC Power Converters
FEATURES
 RoHS Compliant
 2.0” x 1.0” x 0.4” Package Size
 40 Watts Output Power
 Trimmable Output Voltage
 2:1 Wide Input Voltage Ranges
 Shielded Metal Case with Isolated Base-plate
 Single & Dual Outputs
 -40°C to +80°C Operating Temperature Range
 Remote ON/OFF Control
 Over Load, Short Circuit, Over Voltage, and Over
 1500VDC I/O Isolation
Temperature Protection
 High Efficiency up to 92%
 UL/IEC/EN 60950-1 Safety Approvals (Pending)
 Under Voltage Lockout (UVLO)
 Heatsink (Optional)
DESCRIPTION
The DH40 series is the latest generation of high performance DC/DC converters setting a new standard
concerning power density. These converters offer 40 Watts of continuous output power in a 2.0” x 1.0” x 0.4”
encapsulated, shielded metal package. The DH40 series has single and dual output models with 2:1 wide input
voltage ranges of 9-18VDC, 18-36VDC, and 36-75VDC. Advanced circuit topology provides a very high
efficiency up to 92% and an operating temperature range of -40°C to +80°C. Further features include remote
on/off, trimmable output voltage, under-voltage lockout as well as over load, over voltage, short circuit, and overtemperature protection. These converters are RoHS compliant and are ideal for use in battery operated equipment,
instrumentation, distributed power architectures in communication and industrial electronics and many other space
critical applications.
10/31/2012
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 1 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
SPECIFICATIONS: DH40 SERIES
All specifications are based on 25°C, Nominal Input Voltage, and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
TEST CONDITIONS
Min
Typ
Max
9
18
36
-0.7
-0.7
-0.7
12
24
48
18
36
75
25
50
100
9
18
36
Unit
INPUT SPECIFICATIONS
Input Voltage Range
Input Surge Voltage (1s max.)
Start-up Threshold Voltage
Under Voltage Lockout (UVLO)
Start-up Time
Power Up
Remote On/Off
Input Current
Reflected Ripple Current (Page 11)
Internal Filter
Input Fuse (Note 3)
Short Circuit Current
OUTPUT SPECIFICATIONS
Output Voltage
Output Voltage Balance
Line Regulation
Load Regulation
Load Cross Regulation (Dual Output Models)
Output Voltage Setting Accuracy
Output Voltage Trim (Page 10)
Output Power
Output Current
12VDC nominal input models
24VDC nominal input models
48VDC nominal input models
12VDC nominal input models
24VDC nominal input models
48VDC nominal input models
12VDC nominal input models
24VDC nominal input models
48VDC nominal input models
12VDC nominal input models
24VDC nominal input models
48VDC nominal input models
Dual Output Models, Balanced loads
Low line to high line at full load
Single Output Models
Minimum load to full load
Dual Output Models
Asymmetrical load 25% / 100% full load
At 50% load and nominal Vin
% of nominal output voltage
Ripple & Noise (0-20MHz) (Page 12)
Measured with a 1µF M/C
and a 10µF T/C in parallel
Transient Recovery Time (Note 2)
Temperature Coefficient
PROTECTION
Input Polarity Protection
Over Voltage Protection (page 11)
Over Load Protection
Thermal Protection
Short Circuit Protection
REMOTE ON/OFF (Page 11)
Converter On
Positive Logic
Converter Off
On
Control Input Current
Off
Control Common
Stand-by Input Current
10/31/2012
VDC
3.3 & 5VDC Output Models
12, 15, & 24VDC Output Models
Dual Output Models
25% load step change
Shutdown temperature
Vctrl = 5.0V
Vctrl = 0V
Nominal Vin
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
VDC
30
30
ms
See Table
See Table
LC Filter
8000mA slow-blow type
4000mA slow-blow type
2000mA slow-blow type
Hiccup mode 1.5Hz typ.
for EN55022 Class A compliance see page 3
12VDC nominal input models
24VDC nominal input models
48VDC nominal input models
Single Output Models
Dual Output Models
VDC
8.3
16.5
33
Nominal Vin and constant resistive load
Minimum Load
VDC
See Table
±2.0
±0.5
±0.5
±1.0
±5.0
±1.0
%
%
%
%
%Vnom
%
±10
See Table
See Table
No minimum load required
See Table
100
150
150
250
±0.02
mVp-p
µs
%/°C
none
See Table
Current limitation at 150% typ. of Io max., hiccup
110
°C
Hiccup, automatic recovery
3.5~12V or open circuit
0V ~ 1.2 or short circuit
0.5
-0.5
Referenced to negative input
2.5
mA
mA
Page 2 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
SPECIFICATIONS: DH40 SERIES
All specifications are based on 25°C, Nominal Input Voltage, and Maximum Output Current unless otherwise noted.
We reserve the right to change specifications based on technological advances.
SPECIFICATION
TEST CONDITIONS
GENERAL
Efficiency
Switching Frequency
Isolation Voltage (Input to Output)
Isolation Resistance
Isolation Capacitance
Maximum Capacitive Load
ENVIRONMENTAL SPECIFICATIONS
Min
60 seconds
500VDC
100kHz, 1V
KHz
VDC
MΩ
pF
1500
1000
1500
See Table
Operating Temperature (W/ Heatsink)
(see derating curves on page 5)
Natural air convection (20LFM)
Nominal Vin and full load
3.3VDC Output Models
5, 12, & 15VDC Output Models
Dual Output Models
3.3VDC Output Models
5, 12, & 15VDC Output Models
Dual Output Models
-40
-40
-40
-40
-40
-40
12.0
9.0
8.0
6.0
10.0
5.4
4.5
3.0
Natural convection (20LFM)
100LFM convection
200LFM convection
400LFM convection
Natural convection (20LFM)
100LFM convection
200LFM convection
400LFM convection
Case Temperature
Storage Temperature
Humidity (non-condensing)
RFI
Cooling
Lead Temperature
MTBF (calculated)
PHYSICAL SPECIFICATIONS
Weight
Dimensions (L x W x H)
Case Material
Base Material
Potting Material
Pin Material
Heatsink (optional)
SAFETY
Safety Approvals (pending)
Unit
320
Natural air convection (20LFM)
Nominal Vin and full load
Thermal Impedance (W/ Heatsink)
Max
See Table
(see efficiency curves on pages 6~8)
Operating Temperature (W/O Heatsink)
(see derating curves on page 5)
Thermal Impedance (W/O Heatsink)
Typ
+66
+46
+40
+73
+57
+52
°C
°C/W
°C/W
+105
+125
95
Six-sided shielded metal case
natural convection
260
-50
Natural convection is about 20LFM and is not still air (0LFM)
1.5mm from case for 10 seconds
MIL-HDBK-217F at 25°C, Ground Benign
°C
328,000
°C
°C
% RH
°C
hours
1.06oz (30g)
2.0 x 1.0 x 0.43 inches (50.8 x 25.4 x 11 mm)
Aluminum alloy, black anodized coating
FR4 PCB (flammability to UL 94V-0 rated)
Epoxy (UL94-V0)
Copper alloy with gold plate over nickel underplate
See page 9
UL/cUL 60950-1 recognition (CSA certificate), IEC/EN 60950-1 (CB-scheme)
EMI-FILTER TO MEET EN55022, CLASS A; FCC PART 15, LEVEL A
Conducted and Radiated Emissions EN55022 Class A
C3
C3
-INPUT
-OUTPUT
-INPUT
C1
DH40 Module
Single Output
-OUTPUT
C1
+OUTPUT
+INPUT
DH40 Module
Dual Output
+INPUT
COMMON
+OUTPUT
C2
C2
Part No
DH12SXX-40
DH24SXX-40
DH48SXX-40
Part No
DH12DXX-40
DH24DXX-40
DH48DXX-40
C1
10µF/25V 1812 MLCC
4.7µF/50V 1812 MLCC
2.2µF/100V 1812 MLCC
C1
10µF/25V 1812 MLCC
4.7µF/50V 1812 MLCC
2.2µF/100V 1812 MLCC
C2, C3 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC
10/31/2012
C2, C4 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 3 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
MODEL SELECTION TABLE
SINGLE OUTPUT MODELS
Output
Voltage
Output Current
Input Current
Output
Power
Efficiency
Maximum
Capacitive Load
3.9 VDC
26.4W
89%
21000µF
6.2 VDC
40W
89%
13600µF
15 VDC
40W
89%
2400µF
3.7A
18 VDC
40W
90%
1500µF
160mA
3.79A
30 VDC
40W
88%
600µF
8A
75mA
1.22A
3.9 VDC
26.4W
90%
21000µF
0mA
8A
80mA
1.83A
6.2 VDC
40W
91%
13600µF
12 VDC
0mA
3.33A
85mA
1.83A
15 VDC
40W
91%
2400µF
DH24S15-40
15 VDC
0mA
2.67A
75mA
1.83A
18 VDC
40W
91%
1500µF
DH24S24-40
24 VDC
0mA
1.67A
85mA
1.85A
30 VDC
40W
90%
600µF
DH48S3.3-26
3.3 VDC
0mA
8A
40mA
610mA
3.9 VDC
26.4W
90%
21000µF
5 VDC
0mA
8A
50mA
920mA
6.2 VDC
40W
91%
13600µF
12 VDC
0mA
3.33A
50mA
910mA
15 VDC
40W
92%
2400µF
DH48S15-40
15 VDC
0mA
2.67A
50mA
910mA
18 VDC
40W
92%
1500µF
DH48S24-40
24 VDC
0mA
1.67A
50mA
920mA
30 VDC
40W
90%
600µF
Output
Power
Efficiency
Maximum (1)
Capacitive Load
±15 VDC
40W
88%
1200µF*
±18 VDC
40W
88%
750µF*
±15 VDC
40W
89%
1200µF*
±18 VDC
40W
89%
750µF*
±15 VDC
40W
89%
1200µF*
±18 VDC
40W
89%
750µF*
Model Number Input Voltage
Min
Max
3.3 VDC
0mA
8A
120mA
2.47A
5 VDC
0mA
8A
160mA
3.75A
12 VDC
0mA
3.33A
160mA
3.75A
DH12S15-40
15 VDC
0mA
2.67A
150mA
DH12S24-40
24 VDC
0mA
1.67A
DH24S3.3-26
3.3 VDC
0mA
5 VDC
DH12S3.3-26
DH12S5-40
DH12S12-40
12 VDC
(9 – 18 VDC)
DH24S5-40
DH24S12-40
24 VDC
(18 – 36 VDC)
DH48S5-40
DH48S12-40
48 VDC
(36 – 75 VDC)
No Load Max Load
Reflected Ripple Over Voltage
Current (Typ)
Protection
50mA
30mA
20mA
DUAL OUTPUT MODELS
Model Number Input Voltage
DH12D12-40
Output
Voltage
Output Current
Min
Max
Input Current
Reflected Ripple Over Voltage
Protection
No Load Max Load Current (Typ)
12 VDC
±12 VDC ±145mA ±1.67A
DH12D15-40
(9 – 18 VDC)
±15 VDC ±110mA ±1.33A
60mA
3.79A
DH24D12-40
24 VDC
±12 VDC ±145mA ±1.67A
50mA
1.87A
DH24D15-40
DH48D12-40
DH48D15-40
70mA
3.79A
50mA
30mA
(18 – 36 VDC) ±15 VDC ±110mA ±1.33A
45mA
1.87A
±12 VDC ±145mA ±1.67A
65mA
940mA
48 VDC
(36 – 75 VDC) ±15 VDC ±110mA ±1.33A
20mA
65mA
940mA
NOTES
1. “*” for each output
2. Transient recovery time is measured to within 1% error band for a step change in output load from 75% to 100%.
3. All DC/DC converters should be externally fused at the front end for protection.
4. To order the converter with a heatsink, please add the suffix “HS” to the model number. (Ex: DH12S12-40HS)
5. To order the converter without Remote on/off control, please add the suffix “N” to the model number. (Ex: DH12S12-40N)
10/31/2012
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 4 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
POWER DERATING CURVES
DHXXS3.3-26 Derating Curve without Heatsink
DHXXS3.3-26 Derating Curve with Heatsink
100
100
Natural
Convection
20LFM
80
Output Power (%)
Output Power (%)
80
100LFM
60
200LFM
400LFM
40
~
0
20
40
60
80
20
60
80
100 110
DHXXS5-40, DHXXS12-40, DHXXS15-40
Derating Curve with Heatsink
100
Natural
Convection
20LFM
Natural
Convection
20LFM
80
100LFM
60
200LFM
400LFM
40
100LFM
60
200LFM
400LFM
40
20
~0
20
40
60
80
0
-40
100 110
~
0
20
40
60
80
Ambient Temperature (°C)
Ambient Temperature (°C)
DHXXDXX-40
Derating Curve without Heatsink
DHXXDXX-40
Derating Curve with Heatsink
100 110
100
100
Natural
Convection
20LFM
100LFM
60
Natural
Convection
20LFM
80
Output Power (%)
80
200LFM
400LFM
40
100LFM
60
200LFM
400LFM
40
20
20
~
0
20
40
60
80
100 110
0
-40
~
0
Ambient Temperature (°C)
10/31/2012
40
DHXXS5-40, DHXXS12-40, DHXXS15-40
Derating Curve without Heatsink
Output Power (%)
Output Power (%)
~0
Ambient Temperature (°C)
20
Output Power (%)
400LFM
Ambient Temperature (°C)
80
0
-40
200LFM
40
0
-40
100 110
100
0
-40
100LFM
60
20
20
0
-40
Natural
Convection
20LFM
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
20
40
60
80
100 110
Ambient Temperature (°C)
Page 5 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
EFFICIENCY CURVES @ 25°C (12VDC INPUT MODELS)
DH12S5-40 Efficiency vs Load Current
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
DH12S3.3-26 Efficiency vs Load Current
60
50
40
30
9V
20
10
20
30
40
50
60
70
80
90
40
30
9V
12V
10
18V
0
50
20
12V
10
60
18V
0
100
10
20
30
40
% of Full Load
90
80
80
70
70
Efficiency (%)
Efficiency (%)
100
90
60
50
40
30
9V
20
10
0
50
60
100
70
80
90
60
50
40
30
9V
12V
18V
0
100
10
20
30
40
% of Full Load
50
60
70
80
90
100
% of Full Load
DH12D12-40 Efficiency vs Load Current
DH12D15-40 Efficiency vs Load Current
100
100
90
90
80
80
70
70
Efficiency (%)
Efficiency (%)
90
10
18V
40
80
20
12V
30
70
DH12S15-40 Efficiency vs Load Current
100
20
60
% of Full Load
DH12S12-40 Efficiency vs Load Current
10
50
60
50
40
30
9V
20
12V
10
18V
0
60
50
40
30
9V
20
12V
10
18V
0
10
20
30
40
50
60
70
80
90
100
10
20
30
40
% of Full Load
10/31/2012
50
60
70
80
90
100
% of Full Load
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 6 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
EFFICIENCY CURVES @ 25°C (24VDC INPUT MODELS)
DH24S5-40 Efficiency vs Load Current
100
100
90
90
80
80
70
70
Efficiency(%)
Efficiency(%)
DH24S3.3-26 Efficiency vs Load Current
60
50
40
30
18V
20
10
20
30
40
50
60
70
80
90
40
30
18V
24V
10
36V
0
50
20
24V
10
60
36V
0
100
10
20
30
% of Full Load
90
80
80
70
70
Efficiency(%)
Efficiency(%)
100
90
60
50
40
30
18V
20
10
0
50
60
70
80
90
40
30
18V
24V
36V
0
100
10
20
30
90
80
80
70
70
Efficiency(%)
Efficiency(%)
100
60
50
40
30
18V
20
24V
10
36V
0
50
60
60
70
80
90
100
70
80
90
100
60
50
40
30
18V
20
24V
10
36V
0
10
20
30
% of Full Load
10/31/2012
50
DH24D15-40 Efficiency vs Load Current
90
40
40
% of Full Load
100
30
100
50
DH24D12-40 Efficiency vs Load Current
20
90
60
% of Full Load
10
80
10
36V
40
70
20
24V
30
60
DH24S15-40 Efficiency vs Load Current
100
20
50
% of Full Load
DH24S12-40 Efficiency vs Load Current
10
40
40
50
60
70
80
90
100
% of Full Load
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 7 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
EFFICIENCY CURVES @ 25°C (48VDC INPUT MODELS)
DH48S5-40 Efficiency vs Load Current
100
100
90
90
80
80
70
70
Efficiency(%)
Efficiency(%)
DH48S3.3-26 Efficiency vs Load Current
60
50
40
30
36V
20
10
20
30
40
50
60
70
80
90
40
30
36V
48V
10
75V
0
50
20
48V
10
60
75V
0
10
100
20
30
100
100
90
90
80
80
70
70
60
50
40
30
36V
20
10
0
40
50
60
70
80
90
30
36V
48V
75V
0
10
100
20
30
80
70
70
Efficiency(%)
Efficiency(%)
90
80
60
50
40
30
36V
20
48V
10
75V
0
60
60
70
80
90
100
70
80
90
100
60
50
40
30
36V
20
48V
10
75V
0
10
20
30
% of Full Load
10/31/2012
50
DH48D15-40 Efficiency vs Load Current
100
50
40
% of Full Load
90
40
100
40
100
30
90
50
DH48D12-40 Efficiency vs Load Current
20
80
60
% of Full Load
10
70
10
75V
30
60
20
48V
20
50
DH48S15-40 Efficiency vs Load Current
Efficiency(%)
Efficiency(%)
DH48S12-40 Efficiency vs Load Current
10
40
% of Full Load
% of Full Load
40
50
60
70
80
90
100
% of Full Load
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 8 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
MECHANICAL DRAWING
Unit: inches (mm)
0.40
(10.16)
0.20 0.20
(5.08) (5.08)
Bottom View
Ø0.04 (Ø1.00)
1.55 (39.4)
1
0.96 (24.5)
1.80 (45.72)
2.00 (50.8)
2
0.49 (12.41)
PIN CONNECTIONS
3
Pin
Single Output
Dual Output
1
+Vin
+Vin
2
-Vin
-Vin
3
Remote On/Off
Remote On/Off
4
+Vout
+Vout
5
-Vout
Common
6
Trim
-Vout
Tolerance: X.XX±0.01 (X.X±0.25)
X.XXX±0.005 (X.XX±0.13)
Pin Diameter: Ø0.04±0.002 (Ø1.0±0.05)
0.14
(3.6)
0.91 (23.2)
Physical Characteristics
Case Size: 2.0 x 1.0 x 0.43 inches (50.8 x 25.4 x 11 mm)
0.04 (1.1)
5
6
Case Material: Aluminum alloy, black anodized coating
4
Base Material: FR4 PCB (flammability to UL 94V-0 rated)
0.40
(10.16)
0.40
(10.16)
0.22
(5.5)
0.10 (2.54)
Pin Material: Copper alloy with gold plate over nickel underplate
0.43 (11.0)
Potting Material: Epoxy (UL94-V0)
Weight: 1.06oz (30g)
1.00 (25.4)
Heatsink Option (“HS” Suffix)
Unit: inches (mm)
Physical Characteristics
Heatsink Material: Aluminum
Finish: Black Anodized Coating
Weight: 0.3oz (9g)
Advantages of Adding a Heatsink
1.22 (31.1)
1. To help heat dissipation and increase the stability and
reliability of DC/DC converters at high operating temperature
atmosphere.
2. To upgrade the operating temperature of DC/DC converters,
please refer to Derating Curves.
0.71 (18.0) max
1.22 (31.0) max
Heatsink
Thermal pad
Clamp
Converter
10/31/2012
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 9 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
EXTERNAL OUTPUT TRIM
Output can be externally trimmed by using the method shown below
Trim Up
3
Trip Down
3
1
2
DH40 Module
Bottom View
DH40 Module
Bottom View
5
6
1
2
4
6
R up
5
4
R down
DHXXS3.3-26 TRIM TABLE
DHXXS5-40 TRIM TABLE
Trim
Trimup
Rup
Trimdown
Rdown
Trim
Trimup
Rup
Trimdown
Rdown
1%
3.333V
70.50kΩ
3.267V
63.59kΩ
1%
5.050V
36.57kΩ
4.950V
45.53kΩ
2%
3.366V
29.28kΩ
3.234V
30.28kΩ
2%
5.100V
16.58kΩ
4.900V
20.61kΩ
3%
3.399V
16.87kΩ
3.201V
18.19kΩ
3%
5.150V
9.92kΩ
4.850V
12.31kΩ
4%
3.432V
10.90kΩ
3.168V
11.95kΩ
4%
5.200V
6.59kΩ
4.800V
8.15kΩ
5%
3.465V
7.38kΩ
3.135V
8.13kΩ
5%
5.250V
4.59kΩ
4.750V
5.66kΩ
6%
3.498V
5.06kΩ
3.102V
5.56kΩ
6%
5.300V
3.25kΩ
4.700V
4.00kΩ
7%
3.531V
3.42kΩ
3.069V
3.70kΩ
7%
5.350V
2.30kΩ
4.650V
2.81kΩ
8%
3.564V
2.20kΩ
3.036V
2.31kΩ
8%
5.400V
1.59kΩ
4.600V
1.92kΩ
9%
3.597V
1.25kΩ
3.003V
1.21kΩ
9%
5.450V
1.03kΩ
4.550V
1.23kΩ
10%
3.630V
0.49kΩ
2.970V
0.34kΩ
10%
5.500V
0.59kΩ
4.500V
0.68kΩ
Trim
Trimup
Rup
Trimdown
Rdown
Trim
Trimup
Rup
Trimdown
Rdown
1%
12.120V
368.92kΩ
11.880V
394.50kΩ
1%
15.150V
392.98kΩ
14.850V
572.67kΩ
2%
12.240V
161.92kΩ
11.760V
179.74kΩ
2%
15.300V
182.12kΩ
14.700V
248.63kΩ
3%
12.360V
94.97kΩ
11.640V
106.08kΩ
3%
15.450V
108.73kΩ
14.550V
145.60kΩ
4%
12.480V
61.86kΩ
11.520V
68.86kΩ
4%
15.600V
71.43kΩ
14.400V
94.97kΩ
5%
12.600V
42.12kΩ
11.400V
46.39kΩ
5%
15.750V
48.85kΩ
14.250V
64.87kΩ
6%
12.720V
29.00kΩ
11.280V
31.36kΩ
6%
15.900V
33.71kΩ
14.100V
44.92kΩ
7%
12.840V
19.66kΩ
11.160V
20.60kΩ
7%
16.050V
22.86kΩ
13.950V
30.72kΩ
8%
12.960V
12.66kΩ
11.040V
12.51kΩ
8%
16.200V
14.69kΩ
13.800V
20.10kΩ
9%
13.080V
7.23kΩ
10.920V
6.21kΩ
9%
16.350V
8.33kΩ
13.650V
11.86kΩ
10%
13.200V
2.89kΩ
10.800V
1.17kΩ
10%
16.500V
3.23kΩ
13.500V
5.28kΩ
DHXXS12-40 TRIM TABLE
10/31/2012
DHXXS15-40 TRIM TABLE
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 10 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
TEST CONFIGURATIONS
Input Reflected-Ripple Current Test Setup
Input reflected-ripple current is measured with an inductor Lin (4.7µH) and Cin (220µF, ESR < 1.0Ω at 100 KHz)
to simulate source impedance. Capacitor Cin offsets possible battery impedance.
Current ripple is measured at the input terminals of the module. Measurement bandwidth is 0-500 KHz.
To Oscilloscope
+
+
Battery
+Vin
Lin
Cin
Current
Probe
+Out
DC/DC
Converter
-Vin
Load
-Out
Peak-to-Peak Output Noise Measurement Test
Use a 1µF ceramic capacitor and a 10µF tantalum capacitor. Scope measurement should be made by using a BNC
socket, measurement bandwidth is 0-20MHz. Position the load between 50mm and 75mm from the DC/DC
converter.
+Vin
+Out
Single Output
DC/DC
Converter
-Vin
Copper Strip
Cout
-Out
+Vin
Resistive
Scope
Load
Copper Strip
+Out
Dual Output
Com.
DC/DC
Converter
-Vin
-Out
Copper Strip
Cout
Scope
Resistive
Load
Copper Strip
Cout
Scope
Copper Strip
DESIGN & FEATURE CONSIDERATIONS
Remote On/Off
Positive logic remote on/off turns the module on during a logic high voltage on the remote on/off pin and off during
a logic low. To turn the module on and off, the user must supply a switch to control the voltage between the on/off
terminal and the –Vin terminal. The switch can be an open collector or equivalent. A logic low is 0V to 1.2V. A
logic high is 3.5V to 12V. The maximum sink current at on/off terminal (Pin 3) during a logic low is -100µA
Over Current Protection
To provide protection in a fault (output overload) condition, the unit is equipped with internal current limiting
circuitry and can endure overload for an unlimited duration.
Over Voltage Protection
The output over voltage clamp consists of control circuitry which is independent of the primary regulation loop that
monitors the voltage on the output terminals. The control loop of the clamp has a higher voltage set point than the
primary loop. This provides a redundant voltage control that reduces the risk of output over voltage. The OVP level
can be found in the model selection table.
10/31/2012
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 11 of 13
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Rev. A
Input Source Impedance
The power module should be connected to a low ac-impedance input source. Highly inductive source impedances
can affect the stability of the power module.
In applications where power is supplied over long lines and output loading is high, it may be necessary to use a
capacitor at the input to ensure startup.
Capacitor mounted close to the power module helps ensure stability of the unit, it is recommended to use a good
quality low Equivalent Series Resistance (ESR < 1.0Ω at 100 KHz) capacitor of 33µF for the 12V input devices
and a 10µF for the 24V and 48V devices.
+
+Vin
+
DC Power
Source
+Out
DC/DC
Converter
Load
Cin
-
-Vin
-Out
Output Ripple Reduction
A good quality low ESR capacitor placed as close as possible across the load will give the best ripple and noise
performance. To reduce output ripple, it is recommended to use 4.7µF capacitors at the output.
+
+Vin
Single Output
DC/DC
Converter
DC Power
Source
-
+Out
-Vin
+
+Vin
Dual Output
Com.
DC/DC
Converter
DC Power
Source
Cout
Load
-Out
-
+Out
-Vin
-Out
Cout
Load
Load
Cout
Maximum Capacitive Load
The DH40 series has a limitation of maximum connected capacitance on the output. The power module may be
operated in current limiting mode during start-up, affecting the ramp-up and the start-up time. The maximum
capacitance can be found in the model selection table.
Thermal Considerations
Many conditions affect the thermal performance of the power module, such as orientation, airflow over the module,
and board spacing. To avoid exceeding the maximum temperature rating of the components inside the power
module, the case temperature must be kept below 105°C. The derating curves are determined from measurements
obtained in a test setup.
Position of air velocity
probe and thermocouple
15mm / 0.6in
50mm / 2in
Air Flow
DUT
COMPANY INFORMATION
10/31/2012
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 12 of 13
Rev. A
DH40 Series
Single & Dual Outputs
2:1 Wide Input Ranges
40 Watt DC/DC Power Converters
Wall Industries, Inc. has created custom and modified units for over 50 years. Our in-house research and development
engineers will provide a solution that exceeds your performance requirements on-time and on budget. Our ISO9001-2008
certification is just one example of our commitment to producing a high quality, well-documented product for our customers.
Our past projects demonstrate our commitment to you, our customer. Wall Industries, Inc. has a reputation for working
closely with its customers to ensure each solution meets or exceeds form, fit and function requirements. We will continue to
provide ongoing support for your project above and beyond the design and production phases. Give us a call today to discuss
your future projects.
Contact Wall Industries for further information:
Phone:
Toll Free:
Fax:
E-mail:
Web:
Address:
10/31/2012
(603)778-2300
(888)587-9255
(603)778-9797
sales@wallindustries.com
www.wallindustries.com
5 Watson Brook Rd.
Exeter, NH 03833
Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833
603-778-2300 www.wallindustries.com Fax 603-778-9797
Page 13 of 13