Diodes ZR431L - Manual (Page 3)

ZR431L
Issue 3 - April 2008 3 www.zetex.com
© Zetex Semiconductors plc 2008
Block diagram
Deviation of reference input voltage, V
dev
, is defined as
the maximum variation of the reference input voltage
over the full temperature range.
The average temperature coefficient of the reference
input voltage, V
ref
is defined as:
The dynamic output impedance, R
z
, is defined as:
When the device is programmed with two external
resistors, R1 and R2, (fig 2), the dynamic output
impedance of the overall circuit, R’, is defined as:
) 2 1 (
1000000
) (
T T V
x V
ppmIC Vref
ref
dev
−
=
Z
Z
Z
I
V
R
Δ
Δ
=
)
2
1
1 ( '
R
R
R R
Z
+ =