参数资料
型号: NCP1201D100R2
厂商: ON Semiconductor
文件页数: 13/19页
文件大小: 0K
描述: IC CTRLR PWM CM OTP 8SOIC
产品变化通告: LTB Notification 03/Jan/2008
标准包装: 2,500
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-SOIC(0.154",3.90mm 宽)
供应商设备封装: 8-SOICN
包装: 带卷 (TR)
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
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