NCP3065, NCV3065
MTB30P06V
Q4
MMBT3904LT1G
Q5
6x 1R0 ± 1%R
R15
1k
MMSD4148
D2
R1 R2 R3 R4 R5 R6 R7 8 N.C. SWC 1 J1
7
SWE 2
1206 1206 1206 1206 1206 1206
R8
CT
TCAP 3
5 COMP GND 4
+VIN
C3
1 m F / 50 V 1206 0.1 m F
NCP3065
SOIC8
0.1 m F 220 m F / 50 V
J3
1
0.1 m F
R14
R10
R9
BC807 ? LT1G BC817 ? LT1G
0805
1k
? LED
+VAUX
0R15 ± 1%
0R15 ± 1%
R11
ON/OFF 0805
R11
ON/OFF
Figure 25. Buck Demoboard with External Switch Application Schematic
0R04 U1
PF0504.223NL
J2 I PK 1
6 L1
1 V CC +LED
C7 + 15 k C1
C4 + 1.8 nF +
C2 D1 C6
C8 MBRS140LT3G 220 m F /
50 V
C5 100 pF
GND
J4 NU J5
1 1
10 k
0805 R13 R16 R12
Q1 Q2 NU J7
1
J6
GND
1
1k2
J6
1
1k2
0805
Value of Components
Name
C1
C1, C4, C8
C2, C6
C3
C5
C7
D1
D2
L1
Q2
Value
100 m F, 50 V, Electrolytic Capacitor
100 nF, Ceramic Capacitor, 1206
220 m F, 50 V, Electrolytic Capacitor
2.2 nF, Ceramic Capacitor, 0805
100 pF, Ceramic Capacitor, 0805
1 m F / 50 V, Ceramic Capacitor, 1206
MBRS540LT3G, Schottky Diode
MMSD4148T1G, Diode
22 m H
BC817 ? LT1G, SOT23
Name
Q4
Q5
R1
R8
R9
R10
R11
R12, R16
U1
Value
MTB30P06V, P ? MOS transistor
MMBT3904LT1G
40 m W , Resistor 0.5 W
6k8, Resistor 0805
10k, Resistor 0805
1k, Resistor 0805
1k2, Resistor 0805
150 m W , Resistor 0.5 W
NCP3065, SOIC8
Test Results
Test
Line Regulation
Output Ripple
Efficiency
Short Circuit Current
Condition
V in = 8 V to 35 V, I o = 3000 mA
V in = 12 V, I o = 3000 mA
V in = 12 V, I o = 3000 mA
V in = 12 V, Rload = 0.15 W
http://onsemi.com
14
< 6%
< 6%
> 78%
Results
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