LM337

4

MOTOROLA ANALOG IC DEVICE DATA

Figure 2. Load Regulation and

∆IAdj/Load Test Circuit

Figure 3. Standard Test Circuit

Figure 4. Ripple Rejection Test Circuit

VO (min Load) – VO (max Load)

Cin

1.0

µF

R2

1%

R1

120

CO +

RL

(max

Load)

Adjust

Vin

–VI

LM337

Vout

* Pulse testing required.

1% Duty Cycle is suggested.

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

Load Regulation (% VO) =

x 100

IL

IAdj

1.0

µF

–VO (min Load)

–VO (max Load)

VO

RL

+

1.0

µF

CO

R1

120

1%

R2

Cin

Adjust

Vin

LM337

To Calculate R2:

R2 =

– 1

R1

This assumes IAdj is negligible.

* Pulse testing required.

VI

IAdj

Vref

IL

VO

1.0

µF

Vout

RL

+

1.0

µF

CO

1N4002

D1*

Cin

1%

R2

Adjust

Vin

LM337

R1

120

14.3 V

4.3 V

f = 120 Hz

CAdj

+

Vout = –1.25 V

* D1 Discharges CAdj if output is shorted to Ground.

1.0

µF

10

µF

Vout

VO

*

VO (min Load)

Vref

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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and

specifically disclaims any and all liability, including without limitation consequential or incidental damages. “Typical” parameters which may be provided in Motorola

data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals”

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