LM317T 参数 Datasheet PDF下载

LM117/217/317

to improve the ripple rejection of about 15 dB

(C

ADJ

).

An 1µF tantalium (or 25µFAluminium electrolitic)

capacitor on the output to improve transient

response.

In additional to external capacitors, it is good

Figure 5 :

Voltage Regulator with Protection Diodes.

practice to add protection diodes, as shown in

fig.5.

D1 protect the device against input short circuit,

while D2 protect against output short circuit for

capacitance discharging.

D1 protect the device against input short circuit, while D2 protects against output short circuit for capacitors discharging

Figure 6 :

Slow Turn-on 15V Regulator.

Figure 7 :

Current Regulator.

I

o

=

V

r ef

R

1

+

I

ADJ

≈

1.25V

R

1

5/11