ncp1251 ON Semiconductor, ncp1251 Datasheet - Page 2

• Manufacturer Part Number: ncp1251
• Description: Ncp1251 Current-mode Pwm Controller For Off-line Power Supplies
• Manufacturer: ON Semiconductor

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
ORDERING INFORMATION
Specifications Brochure, BRD8011/D.
NCP1251ASN65T1G
NCP1251BSN65T1G
NCP1251ASN100T1G
NCP1251BSN100T1G
Pin N5
OPTIONS
Vbulk
1
2
3
4
5
6
NCP1251ASN100T1G
NCP1251BSN100T1G
NCP1251ASN65T1G
NCP1251BSN65T1G
Device
Controller
Pin Name
OPP/OVP
GND
DRV
V
FB
CS
CC
OVP
Adjust the Over Power Protection
Package Marking
1
2
3
Supplies the controller
Current sense + ramp
Latches off the part
OPP
NCP1251
5AA
5AC
5AD
5A2
compensation
Feedback pin
Driver output
Function
−
Frequency
Figure 1. Typical Application Example
100 kHz
100 kHz
65 kHz
65 kHz
6
5
4
OCP Protection
Autorecovery
Autorecovery
http://onsemi.com
Latch
Latch
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 V
latches off.
The driver’s output to an external MOSFET gate.
ramp
comp.
2
.
Switching Frequency
OCP Latched
Yes
Yes
No
No
100 kHz
100 kHz
65 kHz
65 kHz
.
CC
.
exceeds a certain level, the part permanently
Pin Description
(Pb−Free)
Package
TSOP−6
OCP Auto−Recovery
Yes
Yes
No
No
Tape & Reel
Shipping
3000 /
Vo u t
†