AND8098/D
the temperature rise and reduces the on resistance. Finally,
the efficiency of the circuit is benefited.
EXAMPLES
12 V / 100 mA NCP1052 Buck Demo Board
As shown in Figure 9, a 2 inch by 1.5 inch small
surface-mount demo board of 12 V / 100 mA buck is
presented. The design is made on a single-sided board. The
bill of material is shown in Table 2. The component symbols
are those in Figure 1. In order to have sufficient startup
ability, the V
CC
capacitor is 6.8
µF
which gives a 3.4 ms fault
sampling time. Because of this feature, the circuit enters
fault mode when output current exceeds 200mA after startup
as shown in Figure 10(b). The efficiency of the circuit is
typically 65% at 100 mA.
Figure 9. Layout of the Demo Board
Table 2. Bill of Material of Buck Demo Board
Part No
IC
D, D
1
D
2
D
3
Z
1
Z
2
R
1
C
C
1
C
2
C
3
L
NCP1052ST136
MURS160T3
MMSD914T1
MRA4005T1
MMSZ12T1
MMSZ6V8T1
CRCW08052001FRT1
594D227X9016R2T
VJ1206Y224KXXAT
595D685X9016A2T
400WA10M12.5X16
UP2B-681
Description
Switching Regulator
1A 600V ultrafast
General diode
1A 600V standard recovery
12V 5% zener
6.8V 5% zener
2 kΩ
220
µF,
16 V, tantalum
0.22
µF,
25 V, ceramic
6.8µF, 16V, tantalum
400V 10µF
680µH
Manufacturer
ON Semiconductor
ON Semiconductor
ON Semiconductor
ON Semiconductor
ON Semiconductor
ON Semiconductor
Vishay
Vishay
Vishay
Vishay
Rubycon
Cooper
http://onsemi.com
7
ONSEMI [ ON SEMICONDUCTOR ]
