LM337 데이터 시트보기 (PDF) - ON Semiconductor

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LM337

1.5 A, Adjustable Output, Negative Voltage Regulator

ON Semiconductor 

LM337

R2 1%

Cin

1.0 µF

IAdj

CO +

1.0 µF

R1 120

*ĂPulse testing required.

ăĂ1% Duty Cycle is suggested.

Adjust

Vin

Vout

-VI

LM337

IL

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

*

RL

(max

Load)

-VO (min Load)

-VO (max Load)

Load Regulation (% VO) =

VO (min Load) - VO (max Load)

VO (min Load)

x 100

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

R2 1%

Cin 1.0 µF

VI

IAdj

Adjust

Vin

LM337

To Calculate R2:

R2 =

VO

Vref

-1

R1

This assumes IAdj is negligible.

Vref

Vout

+

CO 1.0 µF

RL

VO

R1 120

IL

* Pulse testing required.

* 1% Duty Cycle is suggested.

Figure 3. Standard Test Circuit

14.3 V

4.3 V

R2 1%

Cin 1.0 µF

+

CAdj 10µF

+

CO 1.0 µF

Adjust

Vin

LM337

R1 120 D1*

Vout

1N4002

RL

VO

Vout = -1.25 V

f = 120 Hz

* D1 Discharges CAdj if output is shorted to Ground.

Figure 4. Ripple Rejection Test Circuit

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