DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. Standard Models FEATURES • RoHS & UL 94V-0 Compliant • No Minimum Load Requirements • Smallest Encapsulated 50W Converter • Trimmable Output Voltage • 4:1 Wide Input Voltage Ranges • Shielded Metal Case with Isolated Base-plate • Single Outputs • Over Load, Short Circuit, Over Voltage, & Over • Remote ON/OFF Control Size: 2.00 x 1.00 x 0.43 inches (50.8 x 25.4 x 11.0 mm) Heatsink Models (Suffix “HS”) Temperature Protection • 1500VDC I/O Isolation • -40°C to +80°C Operating Temperature Range • High Efficiency up to 92% • CSA/UL/IEC/EN 60950-1 Safety Approvals • Under Voltage Lockout (UVLO) • Heatsink (Optional) DESCRIPTION Size: 2.00 x 1.22 x 0.71 inches (50.8 x 31.0 x 18.0 mm) The DH50 series is the latest generation of high performance DC/DC converters setting a new standard concerning power density. These converters offer 50 Watts of continuous output power in a 2.0” x 1.0” x 0.43” encapsulated, shielded metal package. All models have a 2:1 wide input voltage range and a precisely regulated single output. 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. MODEL SELECTION TABLE Model Number Input Voltage Output Voltage Output Current Min Max Input Current Reflected Over Voltage No Load Max Load Ripple Current Protection DHW24S3.3-33 3.3 VDC 0mA 10A 80mA 1528mA 5 VDC 0mA 10A 60mA 2290mA 12 VDC 0mA 4.17A 80mA 2267mA DHW24S15-50 15 VDC 0mA 3.33A 80mA DHW24S24-50 24 VDC 0mA 2.08A DHW48S3.3-33 3.3 VDC 0mA 5 VDC Output Power Efficiency Maximum Capacitive Load 3.9 VDC 33W 90% 26,000µF 6.2 VDC 50W 91% 17,000µF 15 VDC 50W 92% 3,000µF 2263mA 18 VDC 50W 92% 2,000µF 80mA 2286mA 30 VDC 50W 91% 750µF 10A 40mA 764mA 3.9 VDC 33W 90% 26,000µF 0mA 10A 30mA 1145mA 6.2 VDC 50W 91% 17,000µF 12 VDC 0mA 4.17A 60mA 1134mA 15 VDC 50W 92% 3,000µF DHW48S15-50 15 VDC 0mA 3.33A 60mA 1134mA 18 VDC 50W 92% 2,000µF DHW48S24-50 24 VDC 0mA 2.08A 50mA 1143mA 30 VDC 50W 91% 750µF DHW24S5-50 DHW24S12-50 24 VDC (9 - 36 VDC) DHW48S5-50 DHW48S12-50 48 VDC (18 - 75 VDC) 40mA 30mA EMI FILTER EMI-Filter to meet EN55022, Class A; FCC Part 15, Level A Conducted & Radiated Emissions EN55022 Class A C2 -INPUT -OUTPUT C1 DHW50 MODULE L1 +INPUT 12/03/2013 +OUTPUT Model C1 C2 L1 DHW24 10µF/50V 1210 X7S MLCC 1000pF/2KV 1206 MLCC SMTDR54-1R5M-JT8 DHW48 3.3µF/100V 1210 X7S MLCC 1000pF/2KV 1206 MLCC SMTDR54-6R8M-JT8 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 1 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. SPECIFICATIONS: DHW50 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 -0.7 -0.7 24 48 36 75 50 100 9 18 Unit INPUT SPECIFICATIONS Input Voltage Range Input Surge Voltage (100ms max.) Start-up Threshold Voltage Under Voltage Lockout (UVLO) 24VDC nominal input models 48VDC nominal input models 24VDC nominal input models 48VDC nominal input models 24VDC nominal input models 48VDC nominal input models 24VDC nominal input models 48VDC nominal input models Input Current Reflected Ripple Current (Page 9) Internal Filter Input Fuse (Note 2) VDC VDC 7.5 16 VDC Power Up Remote On/Off Start-up Time VDC 30 30 ms See Table See Table LC Filter 10,000mA slow-blow type 5000mA slow-blow type Hiccup mode 0.3Hz typ. For EN55022 Class A compliance see page 1 24VDC nominal input models 48VDC nominal input models Short Circuit Current OUTPUT SPECIFICATIONS Output Voltage Output Voltage Setting Accuracy Line Regulation Load Regulation Minimum Load At 50% load and nominal Vin Low line to high line at full load Minimum load to full load Output Voltage Trim (Note 4) (Page 5) % of nominal output voltage 24VDC output models Others -10 -10 Output Power Output Current Ripple & Noise (20MHz BW) (Page 9) Transient Recovery Time (Note 1) Temperature Coefficient Measured with a 1µF MLCC and a 10µF tantalum capacitor in parallel 3.3V & 5V output models 12V, 15V, & 24V output models 25% load step change See Table ±1.0 %Vnom ±0.5 % ±0.5 % No minimum load required +20 % +10 See Table See Table 100 mVp-p 150 250 µs ±0.02 %/°C PROTECTION Input Polarity Protection Over Voltage Protection (page 9) Over Load Protection Thermal Protection Short Circuit Protection Shutdown temperature none See Table Current limitation at 150% typ. of Io max., hiccup 110 °C Hiccup, automatic recovery REMOTE ON/OFF (Page 9) Positive Logic Control Input Current Converter On Converter Off On Off Control Common Stand-by Input Current 3.5V~12V or open circuit 0V~1.2V or short circuit 0.5 -0.5 Referenced to negative input 2.5 Vctrl = 5.0V Vctrl = 0V Nominal Vin mA mA GENERAL Efficiency Switching Frequency Isolation Voltage (Input to Output) Isolation Resistance Isolation Capacitance Maximum Capacitive Load 12/03/2013 (see efficiency curves on pages 7~8) 60 seconds 500VDC 100kHz, 1V See Table 285 1500 1000 2200 See Table Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] KHz VDC MΩ pF Page 2 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. SPECIFICATIONS: DHW50 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 Unit ENVIRONMENTAL SPECIFICATIONS Operating Temperature (W/O Heatsink) (see derating curves on page 6) Operating Temperature (W/ Heatsink) (see derating curves on page 6) Thermal Impedance (W/O Heatsink) Thermal Impedance (W/ Heatsink) Case Temperature Storage Temperature Humidity (non-condensing) RFI Cooling Lead Temperature MTBF (calculated) Natural air convection (20LFM) Nominal Vin and full load Natural air convection (20LFM) Nominal Vin and full load DHW24S3.3-33, DHW48S3.3-33 DHW24S12-50, DHW24S15-50, DHW48S12-50, DHW48S15-50 DHW24S5-50, DHW24S24-50, DHW48S5-50, DHW48S24-50 DHW24S3.3-33, DHW48S3.3-33 DHW24S12-50, DHW24S15-50, DHW48S12-50, DHW48S15-50 DHW24S12-40, DHW24S15-40 Natural convection (20LFM) 100LFM convection 200LFM convection 400LFM convection Natural convection (20LFM) 100LFM convection 200LFM convection 400LFM convection -40 +61 -40 +53 -40 +46 -40 +69 -40 +62 -40 12.1 9.2 7.8 5.2 9.8 5.4 4.5 3.0 +57 °C °C °C/W °C/W +105 °C +125 °C 95 % RH Six-sided shielded metal case natural convection 260 °C 233,500 hours -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 PHYSICAL SPECIFICATIONS Weight Dimensions (L x W x H) Case Material Base Material Potting Material Pin Material Heatsink (optional) 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 subplate See page 4 “HS” suffix SAFETY & EMC Safety Approvals EMI ESD Radiated Immunity Fast Transient (See Note 5) Surge (See Note 5) Conducted Immunity EN55022 EN61000-4-2 EN61000-4-3 EN61000-4-4 EN61000-4-5 EN61000-4-6 UL/cUL 60950-1 recognition (CSA certificate), IEC/EN 60950-1 (CB-scheme) Class A (See Page 1) Air: ±8KV, Contact±6KV Perf. Criteria A 10V/m Perf. Criteria A ±2KV Perf. Criteria A ±1KV Perf. Criteria A 10V/m Perf. Criteria A NOTES 1. Transient recovery time is measured to within 1% error band for a step change in output load from 75% to 100%. 2. All DC/DC converters should be externally fused at the front end for protection. 3. To order the converter with a heatsink, please add the suffix “HS” to the model number. (Ex: DHW24S12-50HS) 4. Do not exceed maximum power specification when adjusting the output voltage. 5. The DHW50 series can meet EN61000-4-4 & EN61000-4-5 by adding a capacitor across the input pins. Capacitor: CHEMI-CON KY 220µF/100V 6. Other input and output voltages may be available; please call factory for ordering details. 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 3 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. MECHANICAL DRAWINGS Standard Models 0.40 (10.16) 0.20 (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 Assignment 1 +Vin 2 -Vin 3 Remote On/Off 4 +Vout 5 -Vout 6 Trim Unit: inches (mm) 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 0.04 (1.1) 5 6 Case Size: 2.0 x 1.0 x 0.43 inches (50.8 x 25.4 x 11 mm) 4 Case Material: Aluminum alloy, black anodized coating 0.40 (10.16) 0.40 (10.16) 0.22 (5.5) 0.10 (2.54) Base Material: FR4 PCB (flammability to UL 94V-0 rated) 0.43 (11.0) Pin Material: Copper alloy with gold plate over nickel subplate Potting Material: Epoxy (UL94-V0) 1.00 (25.4) Weight: 1.06oz (30g) Heatsink Option (Suffix “HS”) Unit: inches (mm) Physical Characteristics Heatsink Material: Aluminum Finish: Black Anodized Coating Weight: 0.3oz (9g) 1.22 (31.1) Advantages of Adding a Heatsink 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. 3. To order the module with a heatsink please add the suffix “HS” to the model number (Ex: DHW24S12-50HS) 0.71 (18.0) max 1.22 (31.0) max Heatsink Thermal pad Clamp Converter 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 4 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. OUTPUT VOLTAGE ADJUSTMENT Output voltage trim allows the user to increase or decrease the output voltage of a module. This is accomplished by connecting an external resistor between the Trim pin and either the +Vout or –Vout pins. With an external resistor between the Trim and –Vout pins, the output voltage increases. With an external resistor between the Trim and +Vout pins, the output voltage set-point decreases. Trim Up 3 Trim Down 3 1 2 DHW50 Module Bottom View DHW50 Module Bottom View 5 6 1 2 4 6 5 4 R down R up Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS3.3-33 Vout,up Rup 3.333V 70.50kΩ 3.366V 29.28kΩ 3.399V 16.87kΩ 3.432V 10.90kΩ 3.465V 7.38kΩ 3.498V 5.06kΩ 3.531V 3.42kΩ 3.564V 2.20kΩ 3.597V 1.25kΩ 3.630V 0.49kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS5-50 Vout,up 5.050V 5.100V 5.150V 5.200V 5.250V 5.300V 5.350V 5.400V 5.450V 5.500V Rup 36.57kΩ 16.58kΩ 9.92kΩ 6.59kΩ 4.59kΩ 3.25kΩ 2.30kΩ 1.59kΩ 1.03kΩ 0.59kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS3.3-33 Vout,down Rdown 3.267V 63.59kΩ 3.234V 30.28kΩ 3.201V 18.19kΩ 3.168V 11.95kΩ 3.135V 8.13kΩ 3.102V 5.56kΩ 3.069V 3.70kΩ 3.036V 2.31kΩ 3.003V 1.21kΩ 2.970V 0.34kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS5-50 Vout,down 4.950V 4.900V 4.850V 4.800V 4.750V 4.700V 4.650V 4.600V 4.550V 4.500V Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS12-50 Vout,up Rup 12.120V 368.92kΩ 12.240V 161.92kΩ 12.360V 94.97kΩ 12.480V 61.86kΩ 12.600V 42.12kΩ 12.720V 29.00kΩ 12.840V 19.66kΩ 12.960V 12.66kΩ 13.080V 7.23kΩ 13.200V 2.89kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS15-50 Vout,up Rup 15.150V 392.98kΩ 15.300V 182.12kΩ 15.450V 108.73kΩ 15.600V 71.43kΩ 15.750V 48.85kΩ 15.900V 33.71kΩ 16.050V 22.86kΩ 16.200V 14.69kΩ 16.350V 8.33kΩ 16.500V 3.23kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS12-50 Vout,down Rdown 11.880V 394.50kΩ 11.760V 179.74kΩ 11.640V 106.08kΩ 11.520V 68.86kΩ 11.400V 46.39kΩ 11.280V 31.36kΩ 11.160V 20.60kΩ 11.040V 12.51kΩ 10.920V 6.21kΩ 10.800V 1.17kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS15-50 Vout,down Rdown 14.850V 572.67kΩ 14.700V 248.63kΩ 14.550V 145.60kΩ 14.400V 94.97kΩ 14.250V 64.87kΩ 14.100V 44.92kΩ 13.950V 30.72kΩ 13.800V 20.10kΩ 13.650V 11.86kΩ 13.500V 5.28kΩ Trim 2% 4% 6% 8% 10% 12% 14% 16% 18% 20% DHWXXS24-50 Vout,up Rup 24.480V 247.2kΩ 24.960V 109.255kΩ 25.440V 63.38kΩ 25.920V 39.025kΩ 26.400V 27.52kΩ 26.880V 18.39kΩ 27.360V 11.77kΩ 27.840V 7.29kΩ 28.320V 3.308kΩ 28.800V 0.3658kΩ Trim 1% 2% 3% 4% 5% 6% 7% 8% 9% 10% DHWXXS24-50 Vout,down Rdown 23.760V 318.05kΩ 23.520V 146.05kΩ 23.280V 85.8kΩ 23.040V 55.51kΩ 22.800V 37.415kΩ 22.560V 25.625kΩ 22.320V 16.515kΩ 22.080V 9.81kΩ 21.840V 4.9785kΩ 21.600V 0.9185kΩ 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Rdown 45.53kΩ 20.61kΩ 12.31kΩ 8.15kΩ 5.66kΩ 4.00kΩ 2.81kΩ 1.92kΩ 1.23kΩ 0.68kΩ Page 5 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. DERATING CURVES Without Heatsink With Heatsink DHW24S3.3-33 & DHW48S3.3-33 DHW24S3.3-33 & DHW48S3.3-33 100 100 Natural Convection 20LFM 100LFM 60 200LFM 400LFM 40 100LFM 60 400LFM 20 0 -40 ~0 20 40 60 Ambient Temperature (°C) 80 100 0 -40 110 DHW24S12-50, DHW24S15-50, DHW48S12-50, DHW48S15-50 Natural Convection 20LFM Output Power (%) 200LFM 400LFM 40 20 100 110 100LFM 60 200LFM 400LFM 40 20 ~0 20 40 60 Ambient Temperature (°C) 80 100 0 -40 110 DHW24S5-50, DHW24S24-50, DHW48S5-50, DHW48S24-50 ~0 20 40 60 Ambient Temperature (°C) 80 100 110 DHW24S5-50, DHW24S24-50, DHW48S5-50, DHW48S24-50 100 100 Natural Convection 20LFM 100LFM 60 Natural Convection 20LFM 80 Output Power (%) 80 200LFM 400LFM 40 20 12/03/2013 80 Natural Convection 20LFM 80 100LFM 60 0 -40 20 40 60 Ambient Temperature (°C) 100 80 0 -40 ~0 DHW24S12-50, DHW24S15-50, DHW48S12-50, DHW48S15-50 100 Output Power (%) 200LFM 40 20 Output Power (%) Natural Convection 20LFM 80 Output Power (%) Output Power (%) 80 100LFM 60 200LFM 400LFM 40 20 ~0 20 40 60 Ambient Temperature (°C) 80 100 110 0 -40 ~0 20 40 60 Ambient Temperature (°C) Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] 80 100 110 Page 6 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. EFFICIENCY CURVES 24VDC NOMINAL INPUT MODELS DHW24S3.3-33 Efficiency vs Load Current DHW24S5-50 Efficiency vs Load Current 90 90 Efficiency(%) 100 Efficiency(%) 100 80 70 60 9V 80 70 60 9V 24V 50 24V 50 36V 40 36V 40 10 20 30 40 50 60 70 80 90 100 10 20 30 40 % of Full Load 60 70 80 90 90 Efficiency(%) 100 80 70 60 9V 80 70 60 9V 24V 50 24V 50 36V 40 20 30 40 50 60 100 DHW24S15-50 Efficiency vs Load Current 100 10 90 % of Full Load DHW24S12-50 Efficiency vs Load Current Efficiency(%) 50 70 80 90 100 % of Full Load 36V 40 10 20 30 40 50 60 70 80 90 100 % of Full Load DHW24S24-50 Efficiency vs Load Current 100 Efficiency(%) 90 80 70 60 9V 24V 50 36V 40 10 20 30 40 50 60 70 80 90 100 % of Full Load 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 7 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. EFFICIENCY CURVES 48VDC NOMINAL INPUT MODELS Efficiency(%) DHW48S3.3-33 Efficiency vs Load Current DHW48S5-50 Efficiency vs Load Current 100 100 90 90 Efficiency(%) 80 70 60 18V 80 70 60 18V 48V 50 48V 50 75V 75V 40 40 10 20 30 40 50 60 70 80 90 10 100 20 30 40 DHW48S12-50 Efficiency vs Load Current 60 70 80 100 100 90 90 80 70 60 18V 70 60 18V 48V 50 75V 40 20 30 40 50 60 100 80 48V 50 10 90 DHW48S15-50 Efficiency vs Load Current Efficiency(%) Efficiency(%) 50 % of Full Load % of Full Load 70 80 90 100 % of Full Load 75V 40 10 20 30 40 50 60 70 80 90 100 % of Full Load DHW48S24-50 Efficiency vs Load Current 100 Efficiency(%) 90 80 70 60 18V 48V 50 75V 40 10 20 30 40 50 60 70 80 90 100 % of Full Load 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 8 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. 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 + + +Vin Lin DC/DC Converter Current Probe Cin Battery +Out -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 Copper Strip Single Output DC/DC Converter -Vin Cout -Out Scope Resistive Load 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. 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 - 12/03/2013 +Out -Vin Cout Load -Out Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 9 of 11 DHW50 SERIES 50 Watt DC/DC Power Converters Rev B Wall Industries, Inc. 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. A 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 100KHz) capacitor of a 10µF for the 24V and 48V devices. + +Vin + DC Power Source +Out DC/DC Converter Load Cin - -Vin -Out Maximum Capacitive Load The DHW50 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 50mm / 2in Air Flow 15mm / 0.6in DUT MODEL NUMBER SETUP DHW 24 S 12 Series Name Input Voltage Output Quantity 24: 9-36 VDC S: Single Output 48: 18-75 VDC - 50 HS Ouptut Voltage Output Power Heatsink 3.3: 3.3 VDC 33: 33 Watts None: No Heatsink 5: 5 VDC 50: 50 Watts HS: Heatsink 12: 12 VDC 15: 15 VDC 24: 24 VDC 12/03/2013 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 10 of 11 Wall Industries, Inc. Rev B DHW50 SERIES 50 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 ISO9001-2008 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: 12/03/2013 (603)778-2300 (888)597-9255 (603)778-9797 [email protected] www.wallindustries.com 37 Industrial Drive Exeter, NH 03833 Wall Industries, Inc. • 37 Industrial Drive, Exeter, NH 03833 • Tel: 603-778-2300 • Toll Free: 888-597-9255 • Fax 603-778-9797 website: www.wallindustries.com • e-mail: [email protected] Page 11 of 11