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DER-39

更新时间： 2022-04-23 23:00:11

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DER-39 数据手册

DER-39

2.5W Adapter LNK520P

May 13, 2004

R1 was selected to program the peak power point to be 450mA when a transformer with

a nominal inductance value was used.

C3 sets the auto-restart period and also the time the output has to reach regulation

before entering auto-restart from start-up. If a battery load is used then a value of 0.22uF

is typical. However, if the supply is required to start into a resistive load then this should

be increased to 1uF to ensure enough time during start-up to bring the output into

regulation. The type of capacitor is not critical; either a small ceramic or electrolytic may

be used with a voltage rating of 10V or more.

4.4 Output Stage

Diode D6 should be rated for 80% of applied reverse voltage and thermally for average

current multiplied by forward voltage at maximum ambient.

A snubber series RC across D6 may be fitted to improved radiated EMI performance.

Capacitor C5 should be rated for output voltage and ripple current. Depending on the

application, the designer may choose not to derate for ripple current. If the application is

battery charging of equipment such as PDA’s or cell phones, the duty cycle of operation

at high ripple current is likely to be low, perhaps only 1 hour per day. In this case the

capacitor temperature can be allowed to rise significantly during charging without concern

for the overall lifetime.

Resistor R8 acted as preload to prevent the output from exceeding the maximum output

voltage limit as specified in Figure 3 at no-load and high line. Otherwise a preload is not

necessary.

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