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參數資料
| 型號： | NCP1381 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 文件頁數： | 13/26頁 |
| 文件大?。?/td> | 559K |
| 代理商： | NCP1381 |
NCP1381
http://onsemi.com
13
Figure 13. The Softstart Starts During Skip Mode
and Smooths the Current Signature
Figure 14. The 8 s Timeout Helps to Restart the
Controller
Demag Restart
Current Sense and Timeout Restart
D
T
D
T
8 s
8 s
Figure 15. The Internal Softstart is Activated During
Each Skipped Cycles
Overpower Compensation
A FLYBACK converter operating in Borderline
Conduction Mode (BCM) transfers energy from primary to
secondary according to the following law:
Pout
1
2
Therefore, we can see that for various switching frequency
values (dependent on the input condition if the output
demand is fixed), the converter will permanently adjust the
peak current I
P
to keep the output power constant.
By
manipulating the slope definitions S
ON
and S
OFF
(see
Figure 8), we can show that the peak current is defined by:
N
(Vout
Vin
where is the converter’s efficiency, V
in
the input voltage,
V
out
the output voltage. Feeding a math processor lets us
graph the peak variation with the input voltage, as depicted
by Figure 16 for a 90 W converter operating on universal
mains and featuring the following parameters:
V
out
= 19 V @ 4.7 A,
N
P
:N
S
= 1:0.166,
R
sense
= 0.25 , 200 VDC 400 VDC Input Voltage,
t
P
(Propagation Delay) = 100 ns,
L
P
= 700 H, = 0.85 and V
F
= 0.8 V
Note that these elements were selected to design for a 100 W
value, giving us design margin.
Pin
LP
IP
2
F
SW
(eq. 2)
IP
2
Pout
VF)
(Vout
Vin
VF)
N
(eq. 3)
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相關代理商/技術參數 |
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| NCP1381 AM90 WAF | 制造商:ON Semiconductor 功能描述: |
| NCP1381ADAPEVB | 功能描述:BOARD EVAL NCP1381 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:* 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| NCP1381DR2G | 功能描述:電流型 PWM 控制器 ANA 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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1382DR2G | 功能描述:電流型 PWM 控制器 L-STNDBY PWM CNTRLR 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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1392B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuilt Oscillator |
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