Datasheet > DER-39

DER-39

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
帕沃英蒂格盛 - POWERINT		/
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23页	816K
描述
2.5W Adapter using LNK520P

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DER-39 数据手册

DER-39

2.5W Adapter LNK520P

May 13, 2004

4 Circuit Description

The schematic shown in the Figure 3 provides a CV/CC (constant voltage and constant

current) output characteristic form the universal input voltage range of 90 VAC to 265

VAC. The nominal peak power point at the transition from CC to CV is 5.5 V at 450 mA.

The output envelope specification is shown is Figure 2.

4.1 Input EMI Filtering

The incoming AC is rectified and filtered by D1-4, C1 and C2. Resistor RF1 is a

flameproof fusible type to protect against fault conditions and is requirement to meet

safety agency fault testing. This component should be a wire wound type to withstand

input current surges while the input capacitors charge on application of power or during

withstand line-transient testing. Metal film type resistors are not recommended, they do

not have the transient dissipation capabilities required and may fail prematurely in the

field.

The input capacitance is split between C1 and C2 to allow an input pi filter to be formed

by L1. This filters noise associated with the supply to meet EN55022B/CSPR 22 B and

FCC B conducted EMC limits, even when no Y safety capacitor is used.

4.2 LinkSwitch Operation

When the power is applied to the supply, high voltage DC appears at the DRAIN pin of

the LINKSWITCH (U1). The CONTROL pin capacitor C3 is then charged through a

switched high voltage current source connected internally between the DRAIN and

CONTROL pins. When the CONTROL pin voltage reaches approximately 5.7 V relative

to the SOURCE pin, the internal current source is turned off. The internal control circuitry

is activated and the high voltage internal MOSFET starts to switch, using the energy in

C3 to power the IC,

As the current ramps in the primary of the flyback transformer T1, energy is stored. This

energy is delivered to the output when the mosfet turns off each cycle.

The secondary of the transformer is rectified and filtered by D6 and C5 to provide the DC

output to the load.

Control of the output characteristic is entirely sensed from the primary-side by monitoring

the primary-side VOR (voltage output reflected). While the output diode is conducting,

the voltage across the transformer primary is equal to the output voltage plus diode drop

multiplied by the turns ratio of the transformer. Since the LinkSwitch is connected on the

high side of the transformer, VOR can be sensed directly.

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