Datasheet

DataSheet
30W, Dual Output
VER:01 Page 20 of 25 Issued Date：2009/06/22
Input Source Impedance
The converter should be connected to a lowimpedance input source. Highly inductive source impedance can
affect the stability of the converter. Input external L-C filter is recommended to minimize input reflected ripple current.
The inductor has a simulated sourceimpedance of 12μH and capacitoris Nippon chemi-con KYseries 47μF/100V.
The capacitor must be located as close as possible to the input terminals of the converter forlower impedance.
Output Over Current Protection
When excessive output currents occur in the system, circuit protection is required on all convert
ers. Normally,
overload current is maintained at approximately 150 percent of ratedcurrent for PXD30-xxWDxx series.
Hiccup-
mode is a method of operation in the converter whose purpose is to protect the converter from being
damaged during an over-current fault condition. It also enablesthe converter to restart when the fault is removed.
One of the problems resulting from over current is that excessive heat may be generated in power devices;
especially MOSFET and Schottky diodes and the temperature of thos
e devices may exceed their specified limits. A
protectionmechanism has to be used to prevent those power devices from being damaged.
Output Over Voltage Protection
The output over-voltage protection consists of an output Zenerdiode that monitors the voltage on the output
terminals. If the voltage on the output terminals exceeds the over-voltageprotection threshold, then the Zener diode
clamps the output voltage.
Short Circuit Protection
Continuous, hiccup and auto-recovery.
Thermal Consideration