ꢀ ꢁꢂ ꢃ ꢄ ꢅ ꢀ ꢁꢂ ꢃ ꢄ ꢆꢅ ꢀ ꢁꢂ ꢃ ꢄ ꢇꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢅ ꢀ ꢁꢂ ꢃ ꢈ ꢆ ꢅ ꢀꢁ ꢂꢃ ꢈꢇ
ꢆꢉꢊ ꢋꢌ ꢀꢆꢇꢁ ꢍ ꢎꢏ ꢍꢐꢑꢌ ꢑꢒ ꢓ ꢌꢔꢋ ꢓꢀ ꢏꢍ ꢕ ꢋꢁ ꢆꢀꢒ ꢏꢌ
SLVS543A – AUGUST 2004 − REVISED AUGUST 2004
APPLICATION INFORMATION
R
(see Note A)
V
V
O
I(BATT)
R1
0.1%
R1
R2
V
ref
+ ǒ1 )
Ǔ
Vref
TL431
V
O
R2
0.1%
RETURN
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V
.
I(BATT)
Figure 17. Shunt Regulator
V
I(BATT)
V
O
TL431
V
≈2 V
≈V
on
Input
V
off I(BATT)
V
IT
≈ 2.5 V
GND
Figure 18. Single-Supply Comparator With Temperature-Compensated Threshold
V
I(BATT)
R
2N222
(see Note A)
2N222
30 Ω
R1
R2
+ ǒ1 )
Ǔ
Vref
V
O
4.7 kΩ
0.01 µF
TL431
V
O
R1
0.1%
R2
0.1%
NOTE A: R should provide cathode current ≥1 mA to the TL431 at minimum V
.
I(BATT)
Figure 19. Precision High-Current Series Regulator
23
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