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NCP1251ASN65T1G Datasheet(PDF) 2 Page - ON Semiconductor

Part # NCP1251ASN65T1G
Description  Current-Mode PWM Controller for Off-line Power Supplies
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NCP1251ASN65T1G Datasheet(HTML) 2 Page - ON Semiconductor

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NCP1251
www.onsemi.com
2
1
2
3
6
4
5
NCP1251
Vbulk
.
.
ramp
comp.
OPP
Vo u t
OVP
.
Figure 1. Typical Application Example
Pin N
5
Pin Name
Function
Pin Description
1
GND
The controller ground.
2
FB
Feedback pin
Hooking an optocoupler collector to this pin will allow regulation.
3
OPP/OVP
Adjust the Over Power Protection
Latches off the part
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.
4
CS
Current sense + ramp
compensation
This pin monitors the primary peak current but also offers a means to
introduce ramp compensation.
5
VCC
Supplies the controller
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.
6
DRV
Driver output
The driver’s output to an external MOSFET gate.
OPTIONS
Controller
Frequency
OCP
VCC OVP
OVP/OTP
NCP1251ASN65T1G
65 kHz
Latched
Latched
Latched
NCP1251BSN65T1G
65 kHz
Autorecovery
Latched
Latched
NCP1251CSN65T1G
65 kHz
Autorecovery
Autorecovery
Latched
NCP1251FSN65T1G
65 kHz
Autorecovery
Latched
Latched
NCP1251ASN100T1G
100 kHz
Latched
Latched
Latched
NCP1251BSN100T1G
100 kHz
Autorecovery
Latched
Latched
NOTE: F version has a different foldback scheme for improved efficiency.
ORDERING INFORMATION
Device
Package
Marking
OCP Protection
VCC OVP
Protection
Switching
Frequency
Package
Shipping
NCP1251ASN65T1G
5AA
Latch
Latch
65 kHz
TSOP−6
(Pb−Free)
3000 /
Tape & Reel
NCP1251BSN65T1G
5A2
Autorecovery
Latch
65 kHz
NCP1251CSN65T1G
5AE
Autorecovery
Autorecovery
65 kHz
NCP1251FSN65T1G
5AF
Autorecovery
Latch
65 kHz
NCP1251ASN100T1G
5AC
Latch
Latch
100 kHz
NCP1251BSN100T1G
5AD
Autorecovery
Latch
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.


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