NCP1201P100 ON Semiconductor, NCP1201P100 Datasheet - Page 13

• Manufacturer Part Number: NCP1201P100
• Description: IC CTRLR PWM CM OTP 8DIP
• Manufacturer: ON Semiconductor

Specifications of NCP1201P100

• Output Isolation: Isolated
• Frequency Range: 92 ~ 117kHz
• Voltage - Input: 12.5 ~ 16 V
• Voltage - Output: 500V
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Number Of Outputs: 1
• Duty Cycle (max): 83 %
• Output Voltage: - 0.3 V to + 6.5 V
• Output Current: 250 mA
• Mounting Style: Through Hole
• Switching Frequency: 100 KHz
• Operating Supply Voltage: - 0.3 V to + 16 V
• Maximum Operating Temperature: + 150 C
• Fall Time: 41 ns
• Minimum Operating Temperature: - 40 C
• Rise Time: 116 ns
• Synchronous Pin: No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Brownout Detect Protection
electricity brownout, a Bulk Capacitor Voltage Comparator
with programmable hysteresis is included in this device. The
non- -inverting input, pin 1, is connected to the voltage
divider comprised of R
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
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
6) show the relationship between V
voltage divider network resistors.
Equations for resistors selection are:
Assume V
using 4.3 kΩ for R
R Upper + R Lower =
R Lower =
In order to avoid output voltage bouncing during
BULK_H
[1.92 V(V BULK_H − V BULK_L )]
Lower
(50 mA × V BULK_H )
Lower
. The equations below (Equations 5 and
= 90 Vdc and V
(V BULK_H − V BULK_L )
then R
Upper
50 mA
Upper
and R
BULK_L
is about 195.7 kΩ.
BULK
Lower
levels and the
= 80 Vdc, by
as shown in
http://onsemi.com
(eq. 5)
(eq. 6)
13
R
R
Upper
Lower
V
Figure 32. Brown- -Out Protection Operation
BULK
BOK
V
REF
50 mA
1.92 V
+
--
UVLO