LM317LZ 查看數據表（PDF） - Motorola => Freescale

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LM317LZ

Three-Terminal Adjustable Positive Voltage Regulator

Motorola => Freescale 

Vin*

Vin

Cin 0.1µF

LM317L

Figure 2. Load Regulation and ∆IAdj/Load Test Circuit

LM317L

Load Regulation (mV) = VO (min Load) –VO (max Load)

Load Regulation (% VO) =

VO (min Load) – VO (max Load)

VO (min Load)

X

100

Vout

IL

VO (min Load)

VO (max Load)

Adjust

IAdj

R1

240

1%

+

CO 1.0µF

RL

(max Load)

*

RL

(min Load)

R2

1%

* Pulse Testing Required:

1% Duty Cycle is suggested.

Vin

VI

Cin 0.1µF

Pulse Testing Required:

1% Duty Cycle is suggested.

Figure 3. Standard Test Circuit

Vout

LM317L

IL

Adjust

IAdj

R1

240

1%

Vref

ISET

R2

1%

To Calculate R2:

Vout = ISET R2 + 1.250 V

Assume ISET = 5.25 mA

+

CO 1µF

RL

VO

14.30V

4.30V

f = 120 Hz

Figure 4. Ripple Rejection Test Circuit

Vin

Vout

LM317L

Cin 0.1µF

Adjust

R1

240

1%

D1 *

1N4002

CO

+

1µF

Vout = 1.25 V

RL

VO

R2

1.65K

1%

+

** 10µF

* D1 Discharges CAdj if Output is Shorted to Ground.

4

**CAdj provides an AC ground to the adjust pin.

MOTOROLA ANALOG IC DEVICE DATA

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