M5291P/FP
3. Step-down Circuit
V
IN
= 24 V
V
OUT
= 5 V
I
O
= 0.1 A
f = 50 kHz
1
Q
S
R
2
D
Oscillator
7
R
SC
2
Ω
6
8
R
3
1.2 kΩ
C
T
L
440
µH
330 pF
3
1.17 V
Comparator
+
−
+
C
IN
100
µF
V
IN
24 V
4
5
V
OUT
5 V/0.1 A
+
C
OUT
100
µF
R
1
3.6 kΩ
R
2
1.2 kΩ
4. Step-down Circuit with Transistor
V
IN
= 24 V
V
OUT
= 5 V
I
O
= 1 A
f = 50 kHz
PNP
Tr
R
3
100
Ω
1
R
4
300
Ω
2
Oscillator
Q
S
R
D
7
R
SC
0.16
Ω
6
8
L
47
µH
C
T
330 pF
3
1.17 V
Comparator
+
−
+
C
IN
V
IN
24 V
4
5
V
OUT
5 V/1 A
+
C
OUT
100
µF
R
1
3.6 kΩ
R
2
1.2 kΩ
REJ03D0841-0300 Rev.3.00 Jun 15, 2007
Page 5 of 9