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參數(shù)資料
| 型號： | NCP1201P60 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power with Fault Protection Modes |
| 中文描述： | SWITCHING CONTROLLER, 72 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁數(shù)： | 13/20頁 |
| 文件大?。?/td> | 159K |
| 代理商： | NCP1201P60 |
NCP1201
http://onsemi.com
13
Brownout Detect Protection
In order to avoid output voltage bouncing during
electricity brownout, a Bulk Capacitor Voltage Comparator
with programmable hysteresis is included in this device. The
noninverting input, pin 1, is connected to the voltage
divider comprised of R
Upper
and R
Lower
as shown in
Figure 32, monitoring the bulk capacitor voltage level. The
inverting input is connected to a threshold voltage of 1.92 V
internally.
As bulk capacitor voltage drops below the
preprogrammed level, i.e. Pin 1 voltage drops below
1.92 V, a reset signal will be generated via internal
protection logic to the PWM Latch to turn off the Power
Switch immediately. At the same time, an internal current
source controlled by the state of the comparator provides a
mean to setup the voltage hysteresis through injecting
current into R
Lower
. The equations below (Equations 5 and
6) show the relationship between V
BULK
levels and the
voltage divider network resistors.
Equations for resistors selection are:
(VBULK_H
RUpper
RLower
VBULK_L)
50 A
(eq. 5)
RLower
[1.92 V(VBULK_H
(50 A
VBULK_L)]
VBULK_H)
(eq. 6)
Assume V
BULK_H
= 90 Vdc and V
BULK_L
= 80 Vdc, by
using 4.3 k for R
Lower
then R
Upper
is about 195.7 k .
Figure 32. BrownOut Protection Operation
R
Upper
V
BULK
R
Lower
BOK
V
REF
50 A
+
1.92 V
UVLO
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1201P60G | 功能描述:電流型 PWM 控制器 Current Mode PWM w/Fault Protection 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 |
| NCP1203 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit |
| NCP1203/D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203_05 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current−Mode Controller for Universal Off−Line Supplies Featuring Standby and Short Circuit Protection |
| NCP1203_10 | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current--Mode Controller for Universal Off--Line Supplies Featuring Standby and Short Circuit Protection |
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