Output voltage adjustment
For module power supply products with trim or adj output pins, the output working voltage can be adjusted within a certain range according to the resistor or resistor, usually in the range of ± 10%。
For the trim output pin, connect the management center of the resistor to the trim. In the module with all + s and - s pins, the other two sides are connected with + s and - s respectively.
Without +S or -S, each side will receive the output of the relative main path (+S to +Vin, -S to -Vin), and then adjust the resistor. The resistance of resistor is usually 5-10K Ω It's more suitable.
Adj output pin is divided into input side adjustment and output side section. The adjustment method of output side is the same as that of trim pin. At this time, one side of the resistor is connected to the management center, and the other end is connected to the ground.
Input maintenance power circuit
Usually, the module power supply products often have built-in filters, which can consider the requirements of the normal power supply application. If higher requirements for electrical systems are required, the Internet should be upgraded. Can choose LC or π However, it should be noted that smaller inductors and larger capacitors should be selected as much as possible.
In order to avoid damaging the power supply of the module due to the transient high voltage of the input power supply, it is suggested that the customer connect the transient digestion and absorption diode at the input terminal and cooperate with the fuse tube application to ensure that the module is within the safe input working voltage range.
In order to reduce common mode noise and improve y (CY) capacitor, several NF high frequency capacitors are usually selected. R is the safety tube, D1 is the maintenance secondary tube, D2 is the transient digestion absorption secondary tube (p6ke series products).
Remote control on / off power circuit
The actual operation of the remote control switch of the module power supply is carried out according to the REM terminal. Generally, there are two kinds of manipulation methods
(1) Rem is connected to - VIN (reference ground), the remote control is closed, and VREF < 0.4V is specified. REM tilts or connects with + VIN, and vrem > 1V is specified during module operation.
(2) Rem is connected with VIN, remote control is closed, vrem is less than 0.4V. Rem is connected with + VIN, and vrem > 1V is specified during module operation. REM tilt, remote control off, that is to say, "tilt off" (- R).
