SNOS641F – OCTOBER 1999 – REVISED JULY 2013
V
REF
V
O
is the output voltage. The actual value of the internal V
REF
is a function of V
O
. The “corrected” V
REF
is
determined by
=
ΔV
O
(ΔV
REF
/ΔV
O
) + V
Y
•
V
Y
= 1.240 V
ΔV
O
= (V
O
−
V
Y
)
•
(1)
where
and
•
(2)
ΔV
REF
/ΔV
O
is found in the Electrical Characteristics and is typically
−1.55
mV/V. You can get a more accurate
indication of the output voltage by replacing the value of V
REF
in
with the value found using
Note that the actual output voltage can deviate from that predicted using the typical value of
ΔV
REF
/ΔV
O
in
for C-grade parts, the worst-case
ΔV
REF
/ΔV
O
is
−2.5
mV/V. For D-grade parts, the worst-case
ΔV
REF
/ΔV
O
is
−3.0
mV/V.
Typical Applications
Figure 20. Shunt Regulator
V
O
= V
REF
[(R2/R1) + 1]
Figure 21. Adjustable Shunt Regulator
Copyright © 1999–2013, Texas Instruments Incorporated
13
Product Folder Links:
TI [ TEXAS INSTRUMENTS ]
