R

GM432

R1

R2

GND

TYPICAL APPLICATION CIRCUIT

Notes:

1. Set V

according to the following equation:

OUT

V

= V

( 1 +

)+ I

R1

OUT

REF

REF

2. Choose the value for R as follows:

The maximum limit for R should be such that the cathode current, I , is greater

K

than the minimum operating current (80µA) at V

*

IN(MIN)

The minimum limit for R should be such that the cathode current, I , does not

K

exceed 100mA under all load conditions, and the instantaneous turn-on value

for I

does not exceed 150 mA. Both of the following conditions must be met:

K

Rmin

(to limit instantaneous turn-on I )

K

Rmin

(to limit I under normal operating conditions)

K

R1

R2

150mA

V-V

IN(max)

OUT

I

+100mA

OUT(min)

7

Typical Performance Characteristics

Figure 9. Cathode Current vs.

Cathode Voltage

15

10

5

0

-5

-10

-2

-1

0

0.5

1

1.5

V

Cathode Voltage (V)

KA

V

=V

KA

REF

T

=25°C

A

Cathode Voltage (V)

Figure 10. Cathode Current vs.

Cathode Voltage

200

175

150

125

100

75

50

25

0

-25

-50

-1

-0.5

0

0.5

1

1.5

V=V

KA

REF

T

=25 C

A

T , Junction Temperature - C

J

Figure 11. Ref. Voltage vs. Junction

Temperature

250

200

150

100

50

0

0

10

20

3 0

40

50

6 0

70

I =10 mA

K

R1=10KW

R2= Open

T , Junction Temperature - C

J

Figure 12. Ref. Input Current vs.

Junction Temperature

1.2440

1.2420

1.2400

1.2380

1.2360

1.2340

0

10

20

3 0

40

50

6 0

70

I =10 mA

K

A

A

MICROELECTRONICS

GM432

1.24V ADJUSTABLE PRECISION SHUNT REGULATORS

Power Management