2-Way 3 Amps Step-Down DC-DC Regulator User s Guide
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1 -Way 3 Amps Step-Down DC-DC Regulator User s Guide Sure Electronics Inc. PT-PC00-Ver.0
2 Table of Contents -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE Chapter.Brief Introduction of -Way 3 Amps Step-Down DC-DC Regulator Overview Products Images Technical Parameters...3 Chapter.Hardware Description Schematic Parts Layout Phycical Encoder Position Setting for Voltage Adjustment How to Connect Load...9 Chapter3.Test Report Test Instance...0 Chapter4.Warning...4 Chapter5.Contact Us Sure Electronics Inc. PT-PC00- Ver.0-page i
3 Table of Contents -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE NOTES: Sure Electronics Inc. PT-PC00- Ver.0-page ii
4 -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE Chapter.Brief Introduction of -Way 3 Amps Step-Down DC-DC Regulator -. Overview This -way 3 Amps step-down DC-DC regulator is manufactured by Sure Electronics and designed for heavy duty. It is a low cost, high reliability and heavy duty load DC-DC converter. Both ways could provide 3A continuous output and work stably. Output voltage could be switched among 3.3/5/9//5V by encode switches, and could be adjusted through multiturn potentiometers exactly. If needed, other output levels can be got by just changing some resistor value. All regulators had been 00% tested in full load condition, and the burn in test time had been lasted for over hours in several conditions. Test condition is -way ohm load connected to 5V output. All test results were from real measurement, and all diagrams were printed directly from DSO screen capture. We promise that all such snaps are reliable and trusty. If not mentioned particularly, the test conditions are as follow. Open environment air flow cooling, without auxiliary fan cooling, and each test would last -hours. Digital Multimeter DSO Digital Infrared Thermometer Data Logger Power Source Input Ripple and Noise YOKOGAWA / Digit Multimeter Tektronix TDS0 with TDSCMA Communication Module Tempgun Raytek MT4 Self-Designed Product of Sure Electronics Mean Well S Watt, 7V, 3A switching power adapter, output adjusted to 4V DC 37.5mV RMS, 6A output Sure Electronics Inc. PT-PC00- Ver.0-page
5 Brief Introduction of -Way 3 Amps Step-Down DC-DC Regulator This DC-DC regulator could work with most linear and switching power adapters with their voltage output between 9-4V, and current output not less than 5A. This regulator can t provide voltage higher than input voltage, and its maximum stable output is equal to input voltage minus 3 Volts. -. Products Images. Top View Figure. Block Diagram Input Output Noise Filter Input Rectifier Converter Output Rectifier Error AMP Protection circuit Figure Sure Electronics Inc. PT-PC00- Ver.0-page
6 Brief Introduction of -Way 3 Amps Step-Down DC-DC Regulator -3. Technical Parameters DC output range could be selected by encode switch. All regulators have passed full load burn-in test. Protections Short Circuit / Overload/Wrong DC Input Polar Cooling Cooling by Radiation and Air Flow Temperature Increase Centigrade with Full Load, Centigrade with 50% Load DC Input Voltage Range Volts DC DC Inrush Current Cold Start, 40A at 4Volts DC, with 5Volts, 3A Dual Way Output DC Adjustment Range % to -5% Rated Output Voltage (@5Volts Output) DC Output Range /5/9//5Volts, Adjustable by Encoder Overload Protection Short Circuit Protection (Not Guaranteed) Rise. Hold up. Adjust Time ms. Not less than ms. Less than 00µs at Full Load and 4V DC Input 00% Threshold Working Temperature Load Connection P/7.6mm Pitch Terminal Block for DC Input, 3P/7.6mm Pitch Terminal Block for DC Output. Packing Net Weight 0.38kg/3.4Ounce; Gross Weight 0.5kg/7.6Ounce Sure Electronics Inc. PT-PC00- Ver.0-page 3
7 Chapter.Hardware Description -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE -. VIN VIN R6 68 R4 68 D6 N589 R8 03 R 8 R3 33 R4 56 R5 56 U LM596 V IN OUTPUT VOUTA J CON GND ON/OFF FB 4 C 04 R9 8 R 33 R 56 R3 56 C7 0uF/5V + JP SW DIP C C3 0uF/5V D N589 R0 0K 3 R6 03 L3 33uH VOUTB R7 56 D0 N589 D3 N589 L4 33uH C4 0uF/5V + + C6 0uF/5V D9 N589 U LM596 V IN OUTPUT 3 5 GND ON/OFF FB 4 D N589 D5 N589 R 0K 3 L 33uH R5 56 D7 N589 D8 N589 D4 N589 C8 0uF/5V + C 0uF/5V JP SW DIP L 33uH Schematic C9 04 C5 04 J + CON D N589 Figure Sure Electronics Inc. PT-PC00- Ver.0-page 4
8 Hardware Description -. Parts Layout Figure 4 Connection of Top Layer Sure Electronics Inc. PT-PC00- Ver.0-page 5
9 Hardware Description Figure 5 Connection of Bottom Layer Sure Electronics Inc. PT-PC00- Ver.0-page 6
10 Hardware Description -3. Phycical Figure Sure Electronics Inc. PT-PC00- Ver.0-page 7
11 Hardware Description -4. Encoder Position Setting for Voltage Adjustment Output Voltage Encoder Position Setting3 3.3V JP/JP 5V JP/JP 9V JP/JP V JP/JP Set JP,JP to adjust voltage 5V JP/JP 3 Input Voltage must be 3V higher than output voltage. For example, if you need a 9V output, the input voltage must be not less than volts. Input Voltage can never be AC source. Ripple and Noise should be less than Vp-p. Input power should be at least as.5 times as output power. All power cable should be AWG4 or those which have larger diameter Sure Electronics Inc. PT-PC00- Ver.0-page 8
12 Hardware Description -5. How to Connect Load GND OUTOUT Load Load Notice: Figure 7. Negative (Minus) output should be connected to GND or the housing of your instrument, which is also GND of the whole board.. Additional fan is suggested. With fan the temperature increasing could be as low as 0 centigrade when 00% load. 3. If this DC-DC adapter is used in sealed environment and work at fully output, the temperature increasing would be dangerous. Never place any flammable material near the converter. 4. Never connect inductive load Sure Electronics Inc. PT-PC00- Ver.0-page 9
13 -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE Chapter3.Test Report 3-. Test Instance Item and Test condition 3.3V,A 3.3V,3A 5V,A 5V,3A 9V,A 9V,3A V,A V,3A 5V,A 5V,3A Noise Output Tol. () P-P RMS OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT OUT Efficiency () Tol. = (V -V )/V V --- output voltage without load V --- output voltage with load Sure Electronics Inc. PT-PC00- Ver.0-page 0
14 Test Report SCREEN CAPTURE FROM DSO RIPPLE OF 5V A OUTPUT, RMS AND P-P Figure Sure Electronics Inc. PT-PC00- Ver.0-page
15 Test Report RIPPLE OF V A OUTPUT, RMS AND P-P Figure 9 OSCILLOGRAM OF OUTPUT WAY IS SHOWN IN CHANNEL OF THE DSO. OSCILLOGRAM OF OUTPUT WAY IS SHOWN IN CHANNEL OF THE DSO Sure Electronics Inc. PT-PC00- Ver.0-page
16 Test Report 3-. Output Power Max Output Power Environment Temperature Short Endurance Long Low Environment Temperature High Figure Sure Electronics Inc. PT-PC00- Ver.0-page 3
17 -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE Chapter4.Warning. Please check the voltage and polarity of the input power. Make sure that the input voltage is lower than DC 4V and higher than 5V, and constant output current is not less than 5A, otherwise the output may not be stable enough.. Make sure that the output is not short, or it will burn the input adapter and the converter immediately. Protection built in short circuit could not act unless current is high enough but such current may damage the adapter. 3. Make sure that the metal screws do not short any circuit. 4. If users want to measure the RMS current, it is suggested that use a shunt resistor in the circuit and test the voltage drop. Be careful of the too high peak current. 5. Normally the GND of the converter should be connected to the Protection Earth (PE) terminally. Leave it float if you can t make sure how to connect the Protection GND. Use AWG4 or higher diameter cables in the circuit Sure Electronics Inc. PT-PC00- Ver.0-page 4
18 -WAY 3 AMPS STEP-DOWN DC-DC REGULATOR USER S GUIDE Chapter5.Contact Us Sure Electronics Co., Ltd. Floor 5, A zone, Qinhuai Technology Innovation center, NO.05-, DaMing Road, Nanjing, China Tel: (English service, from GMT-0AM, only for technical questions) support@sure-electronics.net Website: Sure Electronics Inc. PT-PC00- Ver.0-page 5
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