SLLS636L – DECEMBER 2004 – REVISED DECEMBER 2009
www.ti.com
TYPICAL CHARACTERISTICS (continued)
170
µH
L
8
180
Ω
S Q
R
7
2
Q2
Q1
1N5819
1
R
SC
0.22
Ω
V
IN
12 V
+
100
µF
5
6
V
CC
I
pk
C
T
3
C
T
1500 pF
+
_ Comparator
1.25-V
Reference
Regulator
4
1.0
µH
C
O
330
µF
+
V
OUT
28 V/175 mA
100
µF
+
V
OUT
+
1.25 (1
)
R2)
R1
R2
R1
2.2 kΩ
47 kΩ
Optional Filter
Figure 6. Step-Up Converter
TEST
Line regulation
Load regulation
Output ripple
Efficiency
Output ripple with optional filter
CONDITIONS
V
IN
= 8 V to 16 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 75 mA to 175 mA
V
IN
= 12 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 175 mA
V
IN
= 12 V, I
O
= 175 mA
RESULTS
30 mV ± 0.05%
10 mV ± 0.017%
400 mV
PP
87.7%
40 mV
PP
6
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