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参数资料
| 型号： | NCP1351LEDGEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 21/27页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD FOR NCP1351LEDG |
| 设计资源： | NCP1351 EVB BOM NCP1351LEDGEVB Gerber Files NCP1351LED EVB Schematic |
| 标准包装： | 1 |
| 电流 - 输出 / 通道： | 700mA |
| 输出及类型： | 1，隔离 |
| 输出电压： | 33V |
| 特点： | 短路保护 |
| 输入电压： | 85 ~ 265 V |
| 已供物品： | 板 |
| 已用 IC / 零件： | NCP1351 |
| 其它名称： | NCP1351LEDGEVBOS |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页当前第21页第22页第23页第24页第25页第26页第27页
NCP1351
HV-Bulk
R3
47k
R4
22
L P = 500 m H
R7
1M
R13
47k
C2
10n
400V
N P :N S = 1:0.25
N P :N aux = 0.18
D5
MBR20200
C5b
1.2mF
25V
L2
2.2 m
R2
1M
D2
D3
C5a
1.2mF
25V
+
+
C7
220 m F
25V
+
V OUT 19V/3A
C13
C12
+ 100 m F
400V
R15
3.7k
U1B
C15
22p
1
2
3
4
U2
8
7
6
5
OVP
Option
MUR 1N4937
160
D6
1N4148
25V
T1
2.2nF
Type = Y1
6A/600V
M1
R8
1k
GND
R12
4k
R10
62k
NCP1351B
R16
10
U1A
R14
2.2k
C6
100n
R18
47k
+
C17
C4
100n
R5
2.5k
C9
100n
R1
2.2k
C10
0.1 m
+
100 m
IC2
TL431
R9
10k
R6
0.4
C8
270pF
C3 C1
4.7 m 100nF
GND
25V
Figure 27. The 19 V Adapter Featuring the Elements Calculated Above
On this circuit, the V CC capacitor is split in two parts, a
low value capacitor (4.7 m F) and a bigger one (100 m F). The
4.7 m F capacitor ensures a low startup time, whereas the
second capacitor keeps the V CC alive in standby mode
(where the switching frequency can be low). Due to D 6 , it
does not hamper startup time.
88
86
84
82
V in = 230 Vac
V in = 100 Vac
80
Application Results
We assembled a board with component values close to
what is described on Figure 27. Here are the obtained
results:
P in @ no-load = 152 mW, V in = 230 Vac
P in @ no-load = 164 mW, V in = 100 Vac
78
76
74
72
The efficiency stays flat to above 80%, and keeps good
0
0.5
1
1.5 2
2.5
3
3.5
even at low output levels. It clearly shows the benefit of the
variable frequency implemented in the NCP1351.
I out (A)
Figure 28. Efficiency Measured at Various Operating
Points
http://onsemi.com
21
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