參數(shù)資料
型號： NCP1351
廠商： ON SEMICONDUCTOR
英文描述： Variable Off Time PWM Controller
中文描述： 變關閉時間PWM控制器
文件頁數(shù)： 17/19頁
文件大?。?/td> 222K
代理商： NCP1351
NCP1351
http://onsemi.com
17
Figure 21. The 19 V Adapter Featuring the Elements Calculated Above
T1
R15
3.7k
C8
270pF
U1A
U1B
+
C15
22p
+
C2
10n
400V
R13
47k
C10
0.1
R1
2.2k
C9
100n
R5
2.5k
C4
100n
+
+
+
U2
OVP
Option
D6
1N4148
R16
10
R6
0.4
C3
4.7
25V
C1
100nF
R7
1M
R3
47k
D3
1N4937
D2
MUR
160
R4
22
R2
1M
+
C12
100 F
400V
HVBulk
NCP1351B
1
2
3
4
8
7
6
5
25V
R18
47k
C17
100
6A/600V
M1
L
P
= 500 H
N
P
:N
S
= 1:0.25
N
P
:N
= 0.18
D5
MBR20200
L2
2.2
V
OUT
19V/3A
C5b
1.2mF
25V
C5a
1.2mF
25V
C13
2.2nF
Type = Y1
C7
220 F
25V
GND
R14
2.2k
R8
1k
R12
4k
R10
62k
R9
10k
GND
C6
100n
IC2
TL431
On this circuit, the V
CC
capacitor is split in two parts, a
low value capacitor (4.7 F) and a bigger one (100 F). The
4.7 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.
Application Results
We assembled a board with component values close to
what is described on Figure 21. Here are the obtained
results:
P
in
@ noload = 152 mW, V
in
= 230 Vac
P
in
@ noload = 164 mW, V
in
= 100 Vac
The efficiency stays flat to above 80%, and keeps good
even at low output levels. It clearly shows the benefit of the
variable frequency implemented in the NCP1351.
Figure 22. Efficiency Measured at Various Operating
Points
72
74
76
78
80
82
84
86
88
0
0.5
1
1.5
2
2.5
3
3.5
E
I
out
(A)
V
in
= 230 Vac
V
in
= 100 Vac
Another benefit of the variable frequency lies in the low
ripple operation at noload. This is what confirms
Figure 23.
Finally, the power supply was tested for its transient
response, from 100 mA to 3 A, high and low line, with a
slewrate of 1 A/ s (Figure 25). Results appear in
Figures 25 and 26 and confirm the stability of the board.
相關PDF資料
PDF描述
NCP1351ADR2G Variable Off Time PWM Controller
NCP1351BDR2G Variable Off Time PWM Controller
NCP1381 Low−Standby High Performance PWM Controller
NCP1381DR2G Low−Standby High Performance PWM Controller
NCP1395APG High Performance Resonant Mode Controller
相關代理商/技術參數(shù)
參數(shù)描述
NCP1351ADAPGEVB 功能描述:電源管理IC開發(fā)工具 NCP1351 57 W ADAPTER EVB RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
NCP1351ADR2G 功能描述:電流型 PWM 控制器 OSPI PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1351APG 功能描述:電流型 PWM 控制器 VRIABLE OFF TM CNTRL RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1351BDR2G 功能描述:電流型 PWM 控制器 OSPI PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1351BPG 功能描述:電流型 PWM 控制器 VRIABLE OFF TM CNTRL RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14
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