GM432 Ver la hoja de datos (PDF) - Gamma Microelectronics Inc.

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Fabricante

GM432

1.24V ADJUSTABLE PRECISION SHUNT REGULATORS

Gamma Microelectronics Inc. 

Power Management

AA

MICROELECTRONICS

GM432

1.24V ADJUSTABLE PRECISION SHUNT REGULATORS

TYPICAL APPLICATION CIRCUIT

VIN

GND

R

R1

VREF

R2

VOUT

GM432

Notes:

1. Set VOUT according to the following equation:

R1

VOUT = VREF ( 1 + R2 )+ IREF R1

2. Choose the value for R as follows:

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

than the minimum operating current (80µA) at VIN(MIN)*

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

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

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

VIN(max)

Rmin 150mA (to limit instantaneous turn-on IK)

Rmin

VIN(max)-VOUT (to limit IK under normal operating conditions)

IOUT(min)+100mA

Typical Performance Characteristics

15

VKA =VREF

TA =25°C

10

5

0

-5

-10

-2

-1

0 0.5 1

1.5

VKA Cathode Voltage (V)

Figure 9. Cathode Current vs.

Cathode Voltage

200

175

150

VKA =VREF

TA =25 C

125

100

75

50

I min

25

0

-25

-50

-1 -0.5

0 0.5 1

1.5

Cathode Voltage (V)

Figure 10. Cathode Current vs.

Cathode Voltage

250

200

IK =10 mA

R1=10KW

R2= Open

1.2440

IK =10 mA

1.2420

150

1.2400

100

1.2380

50

1.2360

0

0 10 20 3 0 40 50 6 0 70

1.2340

0 10 20 3 0 40 50 6 0 70

TJ, Junction Temperature - C

Figure 11. Ref. Voltage vs. Junction

Temperature

TJ, Junction Temperature - C

Figure 12. Ref. Input Current vs.

Junction Temperature

7

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