DH12S5-40N [WALL]

DC-DC Regulated Power Supply Module,;
DH12S5-40N
型号: DH12S5-40N
厂家: WALL INDUSTRIES,INC.    WALL INDUSTRIES,INC.
描述:

DC-DC Regulated Power Supply Module,

文件: 总13页 (文件大小:2209K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
DATASHEET  
Rev. B  
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  
Single & Dual Outputs  
Shielded Metal Case with Isolated Base-plate  
-40°C to +80°C Operating Temperature Range  
Over Load, Short Circuit, Over Voltage, and Over  
Temperature Protection  
Remote ON/OFF Control  
1500VDC I/O Isolation  
High Efficiency up to 92%  
Under Voltage Lockout (UVLO)  
UL/IEC/EN 60950-1 Safety Approvals (Pending)  
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 over-  
temperature 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.  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 1 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
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  
INPUT SPECIFICATIONS  
TEST CONDITIONS  
Min  
Typ  
Max  
Unit  
VDC  
VDC  
VDC  
12VDC nominal input models  
9
18  
36  
-0.7  
-0.7  
-0.7  
12  
24  
48  
18  
36  
75  
25  
50  
100  
9
Input Voltage Range  
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  
Input Surge Voltage (1s max.)  
Start-up Threshold Voltage  
Under Voltage Lockout (UVLO)  
18  
36  
8.3  
16.5  
33  
VDC  
ms  
Power Up  
Remote On/Off  
30  
30  
Start-up Time  
Input Current  
Nominal Vin and constant resistive load  
See Table  
Reflected Ripple Current (Page 11)  
See Table  
Internal Filter  
for EN55022 Class A compliance see page 3  
12VDC nominal input models  
24VDC nominal input models  
LC Filter  
8000mA slow-blow type  
4000mA slow-blow type  
2000mA slow-blow type  
Hiccup mode 1.5Hz typ.  
Input Fuse (Note 3)  
48VDC nominal input models  
Short Circuit Current  
OUTPUT SPECIFICATIONS  
Output Voltage  
Output Voltage Balance  
Line Regulation  
See Table  
±2.0  
Dual Output Models, Balanced loads  
Low line to high line at full load  
Single Output Models  
%
%
±0.5  
±0.5  
±1.0  
Load Regulation  
Minimum load to full load  
%
Dual Output Models  
Load Cross Regulation (Dual Output Models) Asymmetrical load 25% / 100% full load  
±5.0  
±1.0  
%
%Vnom  
%
Output Voltage Setting Accuracy  
Output Voltage Trim (Page 10)  
Output Power  
At 50% load and nominal Vin  
% of nominal output voltage  
±10  
See Table  
Output Current  
See Table  
Single Output Models  
Dual Output Models  
No minimum load required  
Minimum Load  
See Table  
100  
150  
3.3 & 5VDC Output Models  
12, 15, & 24VDC Output Models  
Dual Output Models  
Measured with a 1µF M/C  
and a 10µF T/C in parallel  
Ripple & Noise (0-20MHz) (Page 12)  
mVp-p  
150  
Transient Recovery Time (Note 2)  
Temperature Coefficient  
PROTECTION  
25% load step change  
250  
µs  
%/°C  
±0.02  
Input Polarity Protection  
Over Voltage Protection (page 11)  
Over Load Protection  
none  
See Table  
Current limitation at 150% typ. of Io max., hiccup  
Thermal Protection  
Shutdown temperature  
110  
°C  
Short Circuit Protection  
REMOTE ON/OFF (Page 11)  
Hiccup, automatic recovery  
Converter On  
Positive Logic  
3.5~12V or open circuit  
0V ~ 1.2 or short circuit  
Converter Off  
On  
Control Input Current  
Off  
Control Common  
Vctrl = 5.0V  
Vctrl = 0V  
0.5  
-0.5  
mA  
mA  
Referenced to negative input  
2.5  
Stand-by Input Current  
Nominal Vin  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 2 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
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  
GENERAL  
TEST CONDITIONS  
Min  
Typ  
Max  
Unit  
Efficiency  
(see efficiency curves on pages 6~8)  
See Table  
Switching Frequency  
Isolation Voltage (Input to Output)  
Isolation Resistance  
320  
KHz  
VDC  
MΩ  
pF  
60 seconds  
500VDC  
100kHz, 1V  
1500  
1000  
Isolation Capacitance  
1500  
Maximum Capacitive Load  
ENVIRONMENTAL SPECIFICATIONS  
See Table  
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  
+66  
+46  
+40  
+73  
+57  
+52  
Operating Temperature (W/O Heatsink)  
(see derating curves on page 5)  
Natural air convection (20LFM)  
Nominal Vin and full load  
°C  
°C  
Operating Temperature (W/ Heatsink)  
(see derating curves on page 5)  
Natural air convection (20LFM)  
Nominal Vin and full load  
Natural convection (20LFM)  
100LFM convection  
200LFM convection  
400LFM convection  
Natural convection (20LFM)  
100LFM convection  
Thermal Impedance (W/O Heatsink)  
Thermal Impedance (W/ Heatsink)  
°C/W  
°C/W  
200LFM convection  
400LFM convection  
3.0  
Case Temperature  
Storage Temperature  
Humidity (non-condensing)  
RFI  
+105  
+125  
95  
°C  
°C  
% RH  
-50  
Six-sided shielded metal case  
natural convection  
260  
Cooling  
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  
Lead Temperature  
MTBF (calculated)  
PHYSICAL SPECIFICATIONS  
Weight  
°C  
hours  
328,000  
1.06oz (30g)  
Dimensions (L x W x H)  
Case Material  
Base Material  
Potting Material  
Pin Material  
Heatsink (optional)  
SAFETY  
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  
Safety Approvals (pending)  
UL/cUL 60950-1 recognition (CSA certificate)(6), 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  
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  
C2, C4 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC 1000pF/2KV 1808 MLCC  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 3 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
MODEL SELECTION TABLE  
SINGLE OUTPUT MODELS  
Output Current  
Input Current  
Output  
Voltage  
Reflected Ripple Over Voltage Output  
Current (Typ)  
Maximum  
Capacitive Load  
Model Number Input Voltage  
Efficiency  
Protection  
3.9 VDC  
6.2 VDC  
15 VDC  
18 VDC  
30 VDC  
3.9 VDC  
6.2 VDC  
15 VDC  
18 VDC  
30 VDC  
3.9 VDC  
6.2 VDC  
15 VDC  
18 VDC  
30 VDC  
Power  
26.4W  
40W  
40W  
40W  
40W  
26.4W  
40W  
40W  
40W  
40W  
26.4W  
40W  
40W  
40W  
40W  
Min  
Max  
No Load Max Load  
DH12S3.3-26  
DH12S5-40  
3.3 VDC  
5 VDC  
0mA  
8A  
120mA  
160mA  
160mA  
150mA  
160mA  
75mA  
80mA  
85mA  
75mA  
85mA  
40mA  
50mA  
50mA  
50mA  
50mA  
2.47A  
3.75A  
3.75A  
3.7A  
89%  
89%  
89%  
90%  
88%  
90%  
91%  
91%  
91%  
90%  
90%  
91%  
92%  
92%  
90%  
21000µF  
13600µF  
2400µF  
1500µF  
600µF  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
0mA  
8A  
12 VDC  
DH12S12-40  
12 VDC  
15 VDC  
24 VDC  
3.3 VDC  
5 VDC  
3.33A  
2.67A  
1.67A  
8A  
50mA  
(9 – 18 VDC)  
DH12S15-40  
DH12S24-40  
DH24S3.3-26  
DH24S5-40  
3.79A  
1.22A  
1.83A  
1.83A  
1.83A  
1.85A  
610mA  
920mA  
910mA  
910mA  
920mA  
21000µF  
13600µF  
2400µF  
1500µF  
600µF  
8A  
24 VDC  
DH24S12-40  
12 VDC  
15 VDC  
24 VDC  
3.3 VDC  
5 VDC  
3.33A  
2.67A  
1.67A  
8A  
30mA  
(18 – 36 VDC)  
DH24S15-40  
DH24S24-40  
DH48S3.3-26  
DH48S5-40  
21000µF  
13600µF  
2400µF  
1500µF  
600µF  
8A  
48 VDC  
DH48S12-40  
12 VDC  
15 VDC  
24 VDC  
3.33A  
2.67A  
1.67A  
20mA  
(36 – 75 VDC)  
DH48S15-40  
DH48S24-40  
DUAL OUTPUT MODELS  
Output Current  
Input Current  
Output  
Voltage  
Reflected Ripple Over Voltage Output  
Maximum (1)  
Capacitive Load  
Model Number Input Voltage  
Efficiency  
Current (Typ)  
Protection  
±15 VDC  
±18 VDC  
±15 VDC  
±18 VDC  
±15 VDC  
±18 VDC  
Power  
40W  
40W  
40W  
40W  
40W  
40W  
Min Max  
No Load Max Load  
DH12D12-40  
12 VDC  
±12 VDC ±145mA ±1.67A  
±15 VDC ±110mA ±1.33A  
±12 VDC ±145mA ±1.67A  
±15 VDC ±110mA ±1.33A  
±12 VDC ±145mA ±1.67A  
±15 VDC ±110mA ±1.33A  
70mA  
60mA  
50mA  
45mA  
65mA  
65mA  
3.79A  
3.79A  
1.87A  
1.87A  
940mA  
940mA  
88%  
88%  
89%  
89%  
89%  
89%  
1200µF*  
750µF*  
1200µF*  
750µF*  
1200µF*  
750µF*  
50mA  
(9 – 18 VDC)  
DH12D15-40  
DH24D12-40  
24 VDC  
30mA  
20mA  
(18 – 36 VDC)  
DH24D15-40  
DH48D12-40  
48 VDC  
(36 – 75 VDC)  
DH48D15-40  
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)  
6. This product is Listed to applicable standards and requirements by UL.  
*Due to advances in technology, specifications subject to change without notice.  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 4 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
POWER DERATING CURVES  
DHXXS3.3-26 Derating Curve without Heatsink  
DHXXS3.3-26 Derating Curve with Heatsink  
DHXXS5-40, DHXXS12-40, DHXXS15-40  
Derating Curve without Heatsink  
DHXXS5-40, DHXXS12-40, DHXXS15-40  
Derating Curve with Heatsink  
DHXXDXX-40  
DHXXDXX-40  
Derating Curve without Heatsink  
Derating Curve with Heatsink  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 5 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
EFFICIENCY CURVES @ 25°C (12VDC INPUT MODELS)  
DH12S3.3-26 Efficiency vs Load Current  
DH12S5-40 Efficiency vs Load Current  
DH12S12-40 Efficiency vs Load Current  
DH12S15-40 Efficiency vs Load Current  
DH12D12-40 Efficiency vs Load Current  
DH12D15-40 Efficiency vs Load Current  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 6 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
EFFICIENCY CURVES @ 25°C (24VDC INPUT MODELS)  
DH24S3.3-26 Efficiency vs Load Current  
DH24S5-40 Efficiency vs Load Current  
DH24S12-40 Efficiency vs Load Current  
DH24S15-40 Efficiency vs Load Current  
DH24D12-40 Efficiency vs Load Current  
DH24D15-40 Efficiency vs Load Current  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 7 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
EFFICIENCY CURVES @ 25°C (48VDC INPUT MODELS)  
DH48S3.3-26 Efficiency vs Load Current  
DH48S5-40 Efficiency vs Load Current  
DH48S12-40 Efficiency vs Load Current  
DH48S15-40 Efficiency vs Load Current  
DH48D12-40 Efficiency vs Load Current  
DH48D15-40 Efficiency vs Load Current  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 8 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
MECHANICAL DRAWING  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 9 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
EXTERNAL OUTPUT TRIM  
Output can be externally trimmed by using the method shown below  
DHXXS3.3-26 TRIM TABLE  
DHXXS5-40 TRIM TABLE  
Trim  
1%  
2%  
3%  
4%  
5%  
6%  
7%  
8%  
9%  
10%  
Trimup  
3.333V  
3.366V  
3.399V  
3.432V  
3.465V  
3.498V  
3.531V  
3.564V  
3.597V  
3.630V  
Rup  
Trimdown  
3.267V  
3.234V  
3.201V  
3.168V  
3.135V  
3.102V  
3.069V  
3.036V  
3.003V  
2.970V  
Rdown  
Trim  
1%  
2%  
3%  
4%  
5%  
6%  
7%  
8%  
9%  
10%  
Trimup  
5.050V  
5.100V  
5.150V  
5.200V  
5.250V  
5.300V  
5.350V  
5.400V  
5.450V  
5.500V  
Rup  
Trimdown  
4.950V  
4.900V  
4.850V  
4.800V  
4.750V  
4.700V  
4.650V  
4.600V  
4.550V  
4.500V  
Rdown  
45.53kΩ  
20.61kΩ  
12.31kΩ  
8.15kΩ  
5.66kΩ  
4.00kΩ  
2.81kΩ  
1.92kΩ  
1.23kΩ  
0.68kΩ  
70.50kΩ  
29.28kΩ  
16.87kΩ  
10.90kΩ  
7.38kΩ  
5.06kΩ  
3.42kΩ  
2.20kΩ  
1.25kΩ  
0.49kΩ  
63.59kΩ  
30.28kΩ  
18.19kΩ  
11.95kΩ  
8.13kΩ  
5.56kΩ  
3.70kΩ  
2.31kΩ  
1.21kΩ  
0.34kΩ  
36.57kΩ  
16.58kΩ  
9.92kΩ  
6.59kΩ  
4.59kΩ  
3.25kΩ  
2.30kΩ  
1.59kΩ  
1.03kΩ  
0.59kΩ  
DHXXS12-40 TRIM TABLE  
DHXXS15-40 TRIM TABLE  
Trim  
1%  
2%  
3%  
4%  
5%  
6%  
7%  
8%  
9%  
10%  
Trimup  
12.120V  
12.240V  
12.360V  
12.480V  
12.600V  
12.720V  
12.840V  
12.960V  
13.080V  
13.200V  
Rup  
Trimdown  
11.880V  
11.760V  
11.640V  
11.520V  
11.400V  
11.280V  
11.160V  
11.040V  
10.920V  
10.800V  
Rdown  
Trim  
1%  
2%  
3%  
4%  
5%  
6%  
7%  
8%  
9%  
10%  
Trimup  
15.150V  
15.300V  
15.450V  
15.600V  
15.750V  
15.900V  
16.050V  
16.200V  
16.350V  
16.500V  
Rup  
Trimdown  
14.850V  
14.700V  
14.550V  
14.400V  
14.250V  
14.100V  
13.950V  
13.800V  
13.650V  
13.500V  
Rdown  
368.92kΩ  
161.92kΩ  
94.97kΩ  
61.86kΩ  
42.12kΩ  
29.00kΩ  
19.66kΩ  
12.66kΩ  
7.23kΩ  
394.50kΩ  
179.74kΩ  
106.08kΩ  
68.86kΩ  
46.39kΩ  
31.36kΩ  
20.60kΩ  
12.51kΩ  
6.21kΩ  
392.98kΩ  
182.12kΩ  
108.73kΩ  
71.43kΩ  
48.85kΩ  
33.71kΩ  
22.86kΩ  
14.69kΩ  
8.33kΩ  
572.67kΩ  
248.63kΩ  
145.60kΩ  
94.97kΩ  
64.87kΩ  
44.92kΩ  
30.72kΩ  
20.10kΩ  
11.86kΩ  
5.28kΩ  
2.89kΩ  
1.17kΩ  
3.23kΩ  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 10 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
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.  
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.  
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.  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 11 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
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.  
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.  
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.  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 12 of 13  
DH40 Series  
Single & Dual Outputs  
2:1 Wide Input Ranges  
Rev. B  
40 Watt DC/DC Power Converters  
COMPANY INFORMATION  
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: 2015  
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:  
(603)778-2300  
Toll Free: (888)597-9255  
Fax:  
(603)778-9797  
E-mail:  
Web:  
sales@wallindustries.com  
www.wallindustries.com  
Address: 37 Industrial Drive  
Exeter, NH 03833  
©2019 Wall Industries, Inc. Specifications subject to change without notice. Wall Industries is not responsible for typographical errors. The information contained herein is for  
informational purposes only. This information is provided by Wall Industries and we make no representations or warranties of any kind, express or implied, about the completeness,  
accuracy, reliability, suitability or availability with respect to the information contained in this document for any purpose. All product and manufacturer names are trademarks or  
registered trademarks of their respective companies.  
Wall Industries, Inc. • Tel: 603-778-2300 • Toll Free: 888-597-9255 •  
website: www.wallindustries.com • e-mail: sales@wallindustries.com  
5/30/2019  
Page 13 of 13  

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