FLVOTEK MV10H DC/DC power supply

Linear adjustment rate: ± 0.5% (input voltage changes from minimum to maximum). For example, for MV10H-2415 with 24V input, the input jumps from 18V to 36V, and the output change at 15V does not exceed 75 mV.

Load adjustment rate: ± 1% for main output, ± 1.5% for auxiliary output (negative pressure or second channel of dual module). If the dual output is unbalanced (such as+15V with 80% load, -15V with 20% load), the cross adjustment rate is typically ± 5%. Therefore, in applications that require extremely high symmetry, such as precision bipolar ADC drivers, it is recommended to balance positive and negative loads as much as possible.

3.3 Ripple and Noise

Measured at a bandwidth of 20 MHz, the typical ripple is 40 mVp-p, with a maximum of 100 mVp-p. In practical applications, this series adopts PWM control, with a switching frequency of 312.5 kHz at full load, much higher than the audible frequency of the human ear and easy to filter. Attention: When measuring ripple, it is necessary to use a ground loop (attached to the probe), otherwise high-frequency radiation noise may be introduced, and the reading may reach up to 200 mV.

3.4 Dynamic load response

When the load steps from 25% to 75% (or reverse), the peak deviation of the output voltage is typically ± 3%, and the recovery time is about 300 µ s (maximum 500 µ s). This means that MV10H can cope with sudden changes in current from sleep to full speed operation of digital circuits (FPGA, DSP) without causing system reset.

3.5 Protection Function: Undervoltage, Overcurrent, Short Circuit

Protection type action threshold behavior

Input undervoltage shutdown 5V input:<3.5V; 12V input:<6.5V; 24V input:<15.5V; 48V input:<30V Module shutdown, self recovery after voltage recovery

Overcurrent protection 110%~190% rated output current limit or hiccup mode

Short circuit protection output terminal directly short circuited continuously without damage, automatically restored after removing the short circuit

These protections are crucial for replacing old modules - many early DC/DC modules did not have complete short-circuit protection, which could burn out the module or even cause a fire in case of a subsequent fault. The "automatic recovery" feature of MV10H significantly reduces on-site maintenance costs.

Remote switch and output voltage fine-tuning - flexible power management

4.1 Remote On/Off

Pin 1 (Ctrl) supports positive logic control:

High level (floating or>2.7V): The module is working normally.

Low level (<1.2V or grounded): The module is turned off, the output is zero, and the input static current drops to microampere level.

This function can be used for system power on timing control, low-power standby, or fault interlock protection. In actual replacement design, if the original module does not have a remote switch, the Ctrl pin can be left hanging (pulled up internally), and the module defaults to normally open.

4.2 Output Trim

The MV10H single output model allows the output voltage to be adjusted within ± 10% of the rated value (some models support it, please refer to the detailed manual for details). Connect the Trim pin to+Vout or GND through an external resistor to achieve boost or buck. Formula (typical):

Increase output voltage: Connect a resistor between TRIM and GND

Reduce output voltage: Connect a resistor between TRIM and+VOUT

The fine-tuning function can be used to compensate for long line voltage drop or adapt to non-standard voltage devices (such as fine-tuning 5V to 5.5V for USB charging ports). However, it should be noted that the output power is still limited by 10W after fine-tuning, and the current must be reduced accordingly.

Application Circuit and EMC Design - Practical Methods Using EN55032 Class B

5.1 Basic Application Circuit (Reducing Ripple)

Although the output ripple of MV10H itself is already low, for sensitive loads such as high-precision ADCs and RF circuits, it is recommended to use the typical external circuit shown in Figure 1: parallel 100 µ F electrolytic capacitor (CIN) on the input side and parallel 10 µ F capacitor (COUP) on the output side. The capacitor should be placed near the module pins and connected in parallel with a small capacity ceramic capacitor (0.1 µ F) to suppress high-frequency spikes.

text

Vin  ----[CIN]----+----[MV10H Vin]        [MV10H Vout]----+----[COUT]---- Vout+

|                                          |

GND ------------------------------------- GND

Attention: Excessive output capacitance (exceeding the "Max. Capacitive Load" value in the specification) may cause slow voltage ramp up or trigger short-circuit protection during startup. If a large capacitor must be used, a PTC thermistor can be connected in series or a soft start circuit can be used.

5.2 EMC Enhancement Solution - Meets EN55032 Class B Industrial Standard

Many export devices require conduction and radiation emissions to meet Class B limits. MV10H can meet Class A without external circuits, but can easily pass Class B through the following recommended circuits (see PDF Table 2):