Adjustment of output working voltage of dcdc module power supply

For dcdc module power products with TRIM or ADJ (adjustable) output pins, the output working voltage can be adjusted within the necessary range according to the resistor or adjustable potentiometer, and the usual adjustment range is ±10%.

For the TRIM output pin, connect the potentiometer to TRIM. In all modules with +S and -S pins, connect the other ends to +S and -S respectively. When there is no +S and -S, connect both ends to the output positive and negative poles of the corresponding main circuit (+S to +Vin, -S to -Vin), and then adjust the resistor. The resistance of the resistor is usually 5-10kΩ.

The ADJ output pin is divided into input side adjustment and output side adjustment. The output side adjustment is the same as the adjustment method of TRIM pin. The input side adjustment of the power module can only increase the output working voltage. At this time, connect at least one side of the resistor to the management and the other end to the ground of the input terminal.

Type in to maintain the power circuit

Usually, modular power supplies often have built-in filters, which can be considered for the use of normal switching power supplies. If a higher-regulated electrical system is required, the input filter Internet should be improved. Can choose LC or π-type Internet, but special attention should be paid to choosing smaller inductors and larger capacitors as much as possible.

In order to avoid the transient high voltage of the input switching power supply from damaging the power supply of the module, it is recommended that customers connect a transient digestion and absorption diode at the input end and cooperate with each other with fuse applications to ensure that the control module is within the safe input working voltage range. In order to reduce common-mode noise, Y(Cy) capacitors can be improved, usually a few nf high-frequency capacitors are selected. R is a fuse, D1 is a maintenance diode, and D2 is a transient absorption diode (P6KE series).

Remote control circuit

The actual operation of the remote control switch of the dcdc module power supply is carried out according to the REM end. There are usually two manipulation methods:

REM is connected to -VIN (reference ground), the remote control is turned off, and the standard VREF<0.4v. rem="" is="" suspended="" or="" connected="" to="" and="" the="" module="" requiring="" vrem="">1V.

REM is connected to VIN, the remote control is turned off, and VREM<0.4v is="" specified.="" rem="" connected="" to="" and="" the="" module="" requiring="" vrem="">1V. REM is suspended and remotely turned off, which is the so-called "floating shutdown" (-R).

If the control is to be isolated from the input, the dcdc module power supply can use a photocoupler as a transmission control signal.

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