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| 型号： | NCP1201P100G |
| 厂商： | ON Semiconductor |
| 文件页数： | 13/19页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM CM OTP 8DIP |
| 产品变化通告： | Product Obsolescence 01/Jul/2009 |
| 标准包装： | 50 |
| 输出隔离： | 隔离 |
| 频率范围： | 92kHz ~ 117kHz |
| 输入电压： | 12.5 V ~ 16 V |
| 输出电压： | 500V |
| 工作温度： | -40°C ~ 150°C |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 供应商设备封装： | 8-PDIP |
| 包装： | 管件 |
NCP1201
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
V BULK
V REF
non--inverting 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
pre--programmed level, i.e. Pin 1 voltage drops below
1.92 V, a reset signal will be generated via internal
R Upper
R Lower
BOK
50 m A
1.92 V
+
--
UVLO
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:
Figure 32. Brown--Out Protection Operation
RUpper + RLower =
(VBULK_H ? VBULK_L)
50 m A
(eq. 5)
RLower =
[1.92 V(VBULK_H ? VBULK_L)]
(50 m A × VBULK_H)
(eq. 6)
Assume V BULK_H = 90 Vdc and V BULK_L = 80 Vdc, by
using 4.3 k Ω for R Lower then R Upper is about 195.7 k Ω .
http://onsemi.com
13
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