MD3221N 查看數據表（PDF） - Unspecified

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MD3221N

DC-DC Converter Power IC

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10 External Protection Circuits

◆Connection of Input Protection Devices

While the MD3221N incorporates both over-current

protection and overheat protection functions, these

protection circuits may not operate normally if a

fault or a malfunction develops in the IC. A

protective device (eg a fuse) should be inserted in

the +ve input line to prevent overheating and

consequent smoke or fire as a result of excess

input current.

Select the rated current of the fuse etc in

consideration of factors such as the DC-DC

converter input current and current capacity of

the input power supply.

◆Connection of Over-voltage Protection Circuit

The MD3221N does not incorporate an over-voltage

protection circuit. One of the modes supported is such

that the input voltage will appear unchanged at the output

despite operation being halted if the IC is damaged for

any reason. Such damage to the load may result in smoke

and fire, and an over-voltage protection circuit should

therefore be added to prevent such problems.

A representative example of an over-voltage

protection circuit is shown in the diagram below.

The over-voltage protection circuit is inserted on

the load side of the output smoothing condenser.

● External Protection Circuits

Protection device (eg fuse)

L1

F20

DC

input

18~21

VDD

11~14

VOUT

MD3221N

GND

4,26

P.GND1,2

8,16

Over-voltage protection circuit

+

R20

D20

+

THY20

D21

Load

C5

R21

C20

-

Output voltage

Component number

Component

2.5V

3.3V

5V

9V

12V

F20

Protection device (eg fuse)

Select in accordance with load current.

R20

Resistor

0.1W 22Ω

R21

Resistor

0.1W 100Ω

C20

Ceramic condenser

0.33μF

D20

Diode

M1FL20U 200V 1.1A

D21

Zener diode

HZM2.7N B1 HZM3.6N B1 HZM5.6N B1 HZM11N B1 HZM15N B1

THY20

Thyristor

3P4J−Z 400V 3A

20

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