LM317(2001) Просмотр технического описания (PDF) - Vishay Semiconductors

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Компоненты Описание

производитель

LM317
(Rev.:2001)

3-Terminal Adjustable Output Positive Voltage Regulators

Vishay Semiconductors 

Part Number

Vishay Semiconductor

Fig. 1 – Line Regulation Test Circuit

VIH

VIL

Vin

Cin

0.1µF

Line Regulation (%/V) = VOH -- VOL x100

VOL

Vout

LM317

VOH

VOL

Adjust R1

IADJ

240Ω

1%

Co

RL

1µF

R2

1%

Fig. 2 – Load Regulation and

∆Iadj/Load Test Circuit

Load Regulator (mV) = Vo(min. Load) -- Vo(max. Load)

Vo(min. Load) -- Vo(max. Load)

Load Regulator (%Vo) =

x100

Vo(min. Load)

VI

Vin

Cin

0.1µF

Vout

LM317

Adjust R1

IADJ

R2

1%

IL

240Ω

1%

Co

1µF

VOH (min. Load)

VOL (max. Load)

RL

(min.

Load)

Pulse Testing Required:

1% Duty Cycle is Suggested

Pulse Testing Required:

1% Duty Cycle is Suggested

Fig. 3 – Standard Test Circuit

Vin

Vout

LM317

IL

Adjust R1

IADJ

240

1% Vref

Cin

Co

VI

0.1µF

1µF

ISET

R2

1%

RL Vo

Fig. 4 – Ripple Rejection Test Circuit

24V

14V

f = 120HZ

Vin

Cin

0.1µF

Vout

LM317

240

R1

Adjust

1%

CAdj

Vo = 10V

*D1

1N4002

Co

RL Vo

1µF

R2

10µF

1%

Pulse Testing Required:

1% Duty Cycle is Suggested

To Calculate R2:

Vo = ISET R2 + 1.250V

Assume ISET = 5.25mA

*D1 Discharges CADJ if

Output is Shorted to Ground

Document Number 74809

29-Nov-01

www.vishay.com

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