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PDF US431ALCZ Data sheet ( Hoja de datos )

Número de pieza US431ALCZ
Descripción LOW -VOLTAGE ADJUSTABLE PRECISION SHUNT REGULATOR
Fabricantes UNISEM 
Logotipo UNISEM Logotipo



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FEATURES
SOT23-5 package
0.5% Voltage Reference Initial Accuracy
(US431AL)
Low Operational Cathode Current
(80 uA max)
Unconditionally Stable with only 1uF
Adjustable Output from 1.24V to 6V
0.25Typical Output Impedance
Pin to Pin Compatible with TLV431
APPLICATIONS
Precision Voltage Reference
Linear Regulator Controller
Secondary Side Controller for the Low Voltage
Power Supply Applications
US431L/431AL
LOW -VOLTAGE ADJUSTABLE
PRECISION SHUNT REGULATOR
PRELIMINARY DATASHEET
DESCRIPTION
The US431L product is a 3 terminal adjustable shunt
regulator that can also be used as a precision voltage
reference. Its output voltage may be set to any value
between Vref(1.24V) and 6V with two external resistors
as shown in the typical application circuit. Other appli-
cations of this device include the use as a merged am-
plifier and reference in applications such as Linear regu-
lator or as the secondary side controller in low voltage
power supply applications. The US431L only requires
80uA maximum quiescent current before regulating,
making it ideal as a voltage reference for battery type
applications.
TYPICAL APPLICATION
RB
V IN
US431
Vo = Vref × 1+ RR21
431app1-1.0
VO
R1
Co
R2
Typical application of the US431L as a shunt regulator / voltage reference.
PACKAGE ORDER INFORMATION
Ta (°C)
0 TO 70
0 TO 70
5 LEAD
SOT23-5
US431LCL
US431ALCL
Rev. 1.2
5/11/98
3 PIN PLASTIC
TO-92
US431LCZ
US431ALCZ
8 PIN PLASTIC
SOIC
US431LCS
US431ALCS
2-1

1 page




US431ALCZ pdf
In our previous example, the maximum power dissipa-
tion of the device is calculated under no load and maxi-
mum input supply condition.
The maximum power is calculated using the following
equation :
PMAX
=
VKA
×

VMAX -
RB
VKA

Where :
PMAX = Maximum power dissipation of the 431L
For our example :
PMAX = 3.3 ×  6 1-003.3 = 89 mW
As shown in the power dissipation table, both packages
can handle this power dissipation.
Stability
The US431L has many different regions of stability do-
main as a function of the cathode current which are typi-
cal characteristics of the 3 terminal shunt regulators.
However in general the device will be unconditionaly
stable for any cathode current if the capacitor, CO =
1 uF or bigger is connected from Cathode to Anode
pins. If the cathode current is always kept higher than
500uA under minimum line and maximum load condi-
tions , the CO can be cut to 0.01uF and the system will
be stable.
US431L/431AL
Rev. 1.2
5/11/98
2-5

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