AMS431LAM1 View Datasheet(PDF) - Advanced Monolithic Systems Inc

Part Name

Description

MFG CO.

AMS431LAM1

1.2V SHUNT REGULATOR

Advanced Monolithic Systems Inc 

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TEST CIRCUITS

VIN

IREF

VREF

VZ = VREF

IZ

VIN

VZ

R1

IREF

IZ

R2

VREF

AMS431L

VIN

VZ

IZ OFF

Figure 1. Test Circuit for VZ=VREF

TYPICAL APPLICATIONS

Figure 2. Test Circuit for VREF vs IZ.

Test circuit for IREF.

Figure 3. Test Circuit for Off-State Current

VIN

GND

R1

VREF

R2

VOUT

1) Set the VOUT according to the following equation:

VOUT = VREF1 + R1  + IREFR1

 R2 

2) Choose the value of R as follows:

• The maximum limit for R should be such that the cathode current, IZ is greater than the minimum operating current (80µA) at VIN(min).

• The minimum limit for R should b such that IZ does not exceed 100mA under all load conditions, and the instantaneous turn-on value for IZ does not exceed

150mA. Both of the following conditions must be met:

Rmin ≥ VIN(max) (to limit instantane ous turn - on IZ)

150mA

Rmin ≥ VIN(max) - VOUT (to limit IZ under normal operating conditions )

IOUT(min) + 100mA

3

Advanced Monolithic Systems http://www.ams-semitech.com

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