NCP3065 查看數據表（PDF） - ON Semiconductor
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NCP3065 Datasheet PDF : 18 Pages
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NCP3065, NCV3065
6x 1R0 ±1%R
0R10
R1 R2 R3 R4 R5 R6 R7
J2
1206 1206 1206 1206 1206 1206 1206
1
+VIN
J3
C4
0.1 mF
+
C2
220 mF / 50 V
1
GND
J4
R9
1
BC807-LT1G
+VAUX
10 k
Q1
Q2
NTF2955
Q4
MMBT3904LT1G
Q5
R15
1k
U1
8 N.C. SWC 1
7 IPK SWE 2
6 VCC TCAP 3
CT
5 COMP GND 4
NCP3065
SOIC8
MMSD4148
D2
R8
15 k
C3
1.8 nF
L1
470 mH
C1
1208 0.1 mF
D1
MBRS140LT3G
C5 100 pF
R14
NU
R10
0805 1 k
R13
R12
NU
RSENSE ±1%
J6 R11
1
ON/OFF
BC817-LT1G
Figure 17. Buck Demo Board with External Switch Application Schematic
J1
1
+LED
+
C6
NU
J5
1
-LED
J7
1
GND
This design illustrates the NCP3065 being used as a PFET
controller, the design has been optimized for continuous
current operation with low ripple which allows the output
filter capacitor to be eliminated. Figure 20 illustrates the
efficiency with 1 and 2 LEDs and output currents of 350ĂmA
and 700 mA. Additional data and design information can be
found of this design in Application Note AND8298.
Value of Components
Name
Value
Name
Value
C1, C4
100 nF, Ceramic Capacitor, 1206
Q5
MMBT3904LT1G, SOT23
C2
220 mF, 50 V, Electrolytic Capacitor
R1
100 mW, 0.5 W
C3
1.8 nF, Ceramic Capacitor, 0805
R8
15 k, resistor 0805
C5
100 pF, Ceramic Capacitor, 0805
R9
10 kW, resistor 0805
D1
1 A, 40 V Schottky Rectifier
R10, R15
1 kW, resistor 0805
D2
MMSD4148
R11
1.2 kW, resistor 0805
L1
470 mH, DO5022P-474ML Coilcraft Inductor
R12
RSENSE ±1%, 1206
Q4
NTF2955, P-MOSFET, SOT223
U1
NCP3065, SOIC8
NOTE: RSENSE is used to select LED output current, for 350 mA use 680 mW, for 700 mA use 330 mW and for 1000 mA use 220 mW
Test Results (without output capacitor)
Test
Condition
Line Regulation
Load Regulation
Output Ripple
Efficiency
Vin = 9 V to 35 V, Io = 350 mA
Vin = 12 V, Io = 350 mA, Vo = 3 V to 8 V
Vin = 9 V to 35 V, Io = 350 mA
Vin = 12 V, Io = 350 mA, VOUT = 3 to 8 V
Results
12 mA
13 mA
< 15% IO
> 75%
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