NCP1251 데이터 시트보기 (PDF) - ON Semiconductor
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NCP1251 Datasheet PDF : 24 Pages
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Vbulk
OVP
OPP
NCP1251
1
6
2
5
3
4
NCP1251
.
.
.
ramp
comp.
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Figure 1. Typical Application Example
Pin N5
1
2
3
Pin Name
GND
FB
OPP/OVP
4
CS
5
VCC
6
DRV
Function
−
Feedback pin
Adjust the Over Power Protection
Latches off the part
Current sense + ramp
compensation
Supplies the controller
Driver output
Pin Description
The controller ground.
Hooking an optocoupler collector to this pin will allow regulation.
A resistive divider from the auxiliary winding to this pin sets the OPP
compensation level. When brought above 3 V, the part is fully latched off.
This pin monitors the primary peak current but also offers a means to
introduce ramp compensation.
This pin is connected to an external auxiliary voltage and supplies the
controller. When the VCC exceeds a certain level, the part permanently
latches off.
The driver’s output to an external MOSFET gate.
OPTIONS
Controller
NCP1251ASN65T1G
NCP1251BSN65T1G
NCP1251ASN100T1G
NCP1251BSN100T1G
Frequency
65 kHz
65 kHz
100 kHz
100 kHz
OCP Latched
Yes
No
Yes
No
OCP Auto−Recovery
No
Yes
No
Yes
ORDERING INFORMATION
Device
Package Marking
OCP Protection Switching Frequency
Package
Shipping†
NCP1251ASN65T1G
5AA
Latch
65 kHz
NCP1251BSN65T1G
5A2
NCP1251ASN100T1G
5AC
Autorecovery
Latch
65 kHz
100 kHz
TSOP−6
(Pb−Free)
3000 /
Tape & Reel
NCP1251BSN100T1G
5AD
Autorecovery
100 kHz
†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
http://onsemi.com
2
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