Datasheet

QS
R
C
T
I
pk
Q2
Q1
2
1
C
T
Comparator
_
+
1.25-V
Reference
Regulator
4
5
3
8
180 Ω
7
6
R
SC
0.22 Ω
47 kΩ
R2
L
170 µH
C
O
1N5819
330 µF
1500 pF
R1
2.2 kΩ
100 µF
+
+
V
CC
V
OUT
28 V/175 mA
1.0 µH
100 µF
+
Optional Filter
V
IN
12 V
V
OUT
+ 1.25 (1 )
R2
R1
)
MC33063A
MC34063A
SLLS636M –DECEMBER 2004– REVISED JANUARY 2011 www.ti.com
TYPICAL CHARACTERISTICS (continued)
Figure 6. Step-Up Converter
TEST CONDITIONS RESULTS
Line regulation V
IN
= 8 V to 16 V, I
O
= 175 mA 30 mV ± 0.05%
Load regulation V
IN
= 12 V, I
O
= 75 mA to 175 mA 10 mV ± 0.017%
Output ripple V
IN
= 12 V, I
O
= 175 mA 400 mV
PP
Efficiency V
IN
= 12 V, I
O
= 175 mA 87.7%
Output ripple with optional filter V
IN
= 12 V, I
O
= 175 mA 40 mV
PP
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