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NCP1253 Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NCP1253
Description  Current-Mode PWM Current-Mode PWM Power Supplies
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCP1253 Datasheet(HTML) 2 Page - ON Semiconductor

 
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NCP1253
http://onsemi.com
2
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NCP1253
Vbulk
.
.
ramp
comp.
Vout
.
Figure 1. Typical Application Schematic
PIN FUNCTION DESCRIPTION
Pin No.
Pin Name
Function
Description
1
GND
The controller ground.
2
FB
Feedback pin
Hooking an optocoupler collector to this pin will allow
regulation.
3
NC
Non−connected pin
The pin is electrically inert and can be grounded if necessary
4
CS
Current sense + ramp compensation
This pin monitors the primary peak current but also offers a
means to introduce slope compensation.
5
VCC
Supplies the controller – protects the IC
This pin is connected to an external auxiliary voltage. An OVP
comparator monitors this pin and offers a means to latch the
converter in fault conditions.
6
DRV
Driver output
The driver’s output to an external MOSFET gate.
OPTIONS
Controller
Frequency
OCP Latched
OCP Auto−Recovery
NCP1253ASN65T1G
65 kHz
Yes
No
NCP1253BSN65T1G
65 kHz
No
Yes
NCP1253ASN100T1G
100 kHz
Yes
No
NCP1253BSN100T1G
100 kHz
No
Yes
ORDERING INFORMATION
Device
Package
Marking
OCP
Protection
Switching
Frequency
(kHz)
Package
Shipping
NCP1253ASN65T1G
53A
Latch
65
TSOP−6
(Pb−Free)
3000 / Tape & Reel
NCP1253BSN65T1G
532
Auto
Recovery
65
NCP1253ASN100T1G
53C
Latch
100
NCP1253BSN100T1G
53D
Auto
Recovery
100
†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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