FLVOTEK MV10H DC/DC power supply

Input voltage MOV L (common mode choke) C1, C2, C4 CY1, CY2

5V -4.7 µ H (differential mode) 4.7 µ F+2200 µ F+4.7 µ F 1 nF/2 kV

12V 200V 470 µ H common mode 4.7 µ F+330 µ F+1 µ F+330 µ F 1 nF/2 kV

24V 200V 4.7 mH common mode 680 µ F+1 µ F+330 µ F+4.7 µ F 1 nF/2 kV

48V 140V 4.7 mH common mode 680 µ F+1 µ F+330 µ F+4.7 µ F 1 nF/2 kV

Design points:

MOV: Varistors are used to suppress input surges.

Common mode choke (LCM): Select the appropriate inductance (470 µ H~4.7 mH) and ensure that the rated current is not less than the maximum input current.

Y capacitors (CY1, CY2): connected from the input/output terminal to the chassis ground (PGND), can effectively filter out common mode noise. The withstand voltage needs to be above 2 kV.

Fuse: The input terminal should be connected in series with a slow melting fuse that meets UL certification, with a rated current equal to the maximum input current multiplied by 1.5 times.

Engineering experience: Many replacement projects did not consider EMI filtering for the original power module, resulting in excessive overall radiation. Using MV10H in conjunction with the recommended circuit not only improves conversion efficiency, but also passes certification testing in one go.

Thermal design and derating curve

6.1 Operating temperature range

MV10H can operate at full load in ambient temperatures ranging from -40 ℃ to+85 ℃, provided that the derating curve is met (see PDF derating diagram). Typical derating requirements:

Below+55 ℃: capable of outputting 100% rated power.

+55 ℃ to+85 ℃: For every 1 ℃ increase, the output power linearly decreases to 50% (at 85 ℃).

It is not recommended to use above+85 ℃.

6.2 Suggestions for heat dissipation installation

Due to the use of 2 "× 1" metal aluminum shell packaging, the thermal pad has good contact with the outer shell. In a sealed computer case, it is recommended to:

Apply thermal grease or install thermal pads between the bottom of the module and the metal casing.

Avoid stacking thermal sensitive components around the module.

For high current models with 48V input and 3.3V output (such as MV10H-4803, output 2.4A), more attention should be paid to heat dissipation, and small heat sinks can be installed.

Mechanical dimensions and pin definitions

The packaging of MV10H is standard DIP 24 (but the actual number of pins is 6 or 5, depending on the single/dual output), with dimensions of 50.8 mm x 25.4 mm x 12 mm (length x width x height) and pin spacing of 2.54 mm (0.1 inch), compatible with the vast majority of existing DIP sockets and PCB hole positions.

Pin Function Table

Pin number Single output model Dual output model

1 Ctrl Ctrl

2 GND (input ground) GND (input ground)

3 Vin (positive input) Vin (positive input)

4 +Vout +Vout

5 Pin less COM (Common Ground)

6 No Pin Out

Pin verification during replacement: If the original module uses SIP or different pin sorting, an adapter board may need to be made. But the 2 "× 1" DIP package of MV10H is one of the most universal sizes, which can directly replace most industry standards (such as ISO9000 series compatible modules).

Practical case: How to replace a discontinued 10W isolated power supply with MV10H

Scene reproduction

A certain factory's imported PCB drilling machine uses Lambda PXD10-24D15 (24V input, ± 15V/0.33A output, DIP package) on its control board. This module has been discontinued and the original model cannot be found on the market. Alternative requirements: 1.5kV isolation, equivalent efficiency, pins as close as possible, working environment temperature of 50 ℃ and vibration.

Replacement steps

Electrical parameter matching: ± 15V, 10W ->MV10H-2415D (24V input, ± 15V output, 334 mA, efficiency 86%, pin definition completely consistent).

Pin compatibility check: The original module is a 6-pin DIP with a spacing of 2.54mm, and the MV10H pin position is the same, so there is no need to change the PCB.

Capacitive load: The output end of the original board already has 100 µ F electrolysis (each output to ground). MV10H-2415D allows a maximum capacitive load of 330 µ F, meeting the requirements.

EMC modification: The original system had no input filter, and the conducted emission occasionally exceeded the standard. The new design incorporates a common mode choke (470 µ H) and two Y capacitors, successfully passing EN55032 Class B.

Long term reliability: MTBF>1 million hours, far higher than the original module's 500000 hours, and comes with a 3-year warranty.

After replacement testing: The measured errors of ± 15V output at full load are+1.2% and -1.8%, respectively, with a ripple of 35 mVp-p. The dynamic response meets the requirements of spindle motor control.

Common troubleshooting and precautions

Possible causes and solutions for the fault phenomenon

No output input voltage below the start-up threshold when powered on; Ctrl grounding measurement input voltage; Disconnect the Ctrl pin (floating)

Low output voltage and heavy load (exceeding 10W); Significant input line loss reduces load; Bold input wire or increase input voltage

The output ripple is large and the output capacitance does not meet the recommended value; Measurement method error: adding 10 µ F+0.1 µ F ceramic capacitor; Use ground wire loop probe