-
2022-09-23 12:41:07
Zr431 is a three-terminal adjustable parallel regulator
illustrate
The Zr431 is a three-terminal adjustable shunt regulator that provides excellent temperature stability and output current handling capability up to 100mA. By selecting two external divider resistors, the output voltage can be set to any selected voltage between 2.5 and 20 volts. These devices can be used as replacements for Zener diodes in many applications where improved performance of Zener diodes is required.
Features Surface Mount SOT223 and SOT23 Packages 2%, 1% and 0.5% Tolerance Maximum Temperature Coefficient 55 ppm/°C Operating Temperature Compensation Programmable Output Voltage 50µA to 100 mA Over Temperature Current Sink Capability Low Output Noise All Package Options All "green"" molding compound (no BR, SB) and lead free finish/RoHS compliant (Note 1)
PIN assignment
ApplicationsShunt RegulatorsSeries RegulatorsVoltage MonitorsOver/Under Voltage ProtectionSwitch Mode Power Supplies
Figure 1 Test circuit with VZ=VREF
Figure 2 Test circuit of VZ>VREF
Figure 3 Off-state current test circuit
The reference input voltage deviation vdev is the maximum change in the reference input voltage over temperature.
The average temperature coefficient of the reference input voltage Vref is defined as:
V (T1 T2) 1000000V
V (ppm/c)
Ref Dev Ref 8722 ;×=dynamic output impedance Rz is defined as:
ΔΔ = When the device is programmed with two external resistors R1 and R2 (Figure 2), the dynamic output impedance R' of the entire circuit is defined as:
