AMS431L View Datasheet(PDF) - Advanced Monolithic Systems Inc

Part Name

Description

Manufacturer

AMS431L

1.2V SHUNT REGULATOR

Advanced Monolithic Systems Inc 

TEST CIRCUITS

VIN

IREF

VREF

VZ = VREF

IZ

Figure 1. Test Circuit for VZ=VREF

TYPICAL APPLICATIONS

AMS431L

VIN

VZ

R1

IREF

IZ

R2

VREF

VIN

VZ

IZ OFF

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 instantaneous turn - on IZ)

150mA

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

IOUT(min) + 100mA

Advanced Monolithic Systems, Inc. www.advanced-monolithic.com Phone (925) 443-0722 Fax (925) 443-0723

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