ꢀ ꢁꢂ ꢂ ꢃ ꢄ ꢂꢅ ꢆ ꢀ ꢁꢂ ꢇꢃ ꢄꢂ ꢅ
ꢈ ꢉ ꢊ ꢋꢅ ꢌ ꢍꢅ ꢎ ꢏꢐ ꢐ ꢑꢒ ꢓꢏꢔ ꢁꢎꢓ ꢕꢖꢗ ꢍꢘꢒ ꢕꢖ ꢙ ꢑꢚ ꢕ ꢒꢁ ꢛꢕꢖ ꢙ ꢘꢍꢙ ꢔ ꢜꢅꢒꢐ ꢘꢑ
SLLS636D – DECEMBER 2004 – REVISED MARCH 2005
TYPICAL CHARACTERISTICS
1
8
Q2
S
R
Q
Q1
2
7
6
L
I
R
88 µH
pk
SC
0.24 Ω
C
T
Oscillator
V
in
3
V
CC
4.5 V to
6.0 V
1N5819
1.25-V
Reference
Regulator
+
+
+
_
100 µF
1500 pF
4
Comparator
5
1.0 µH
100 µF
R1
953 Ω
V
out
−12 V/100 mA
V
out
C
R2
8.2 kΩ
O
1000 µF
+
+
Optional Filter
RESULTS
TEST
CONDITIONS
= 4.5 V to 6 V, I = 100 mA
Line Regulation
Load Regulation
Output Ripple
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
3 mV 0.12%
0.022 V 0.09%
O
= 5 V, I = 10 mA to 100 mA
O
= 5 V, I = 100 mA
500 mV
910 mA
62.2%
O
PP
Short-Circuit Current
Efficiency
= 5 V, R = 0.1 Ω
L
= 5 V, I = 100 mA
O
Output Ripple With Optional Filter
= 5 V, I = 100 mA
70 mV
PP
O
Figure 10. Voltage-Inverting Converter
9
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
