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  ON Semiconductor Electronic Components Datasheet  

NCP1250 Datasheet

Current-Mode PWM Controller

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NCP1250 pdf
NCP1250
Current-Mode PWM
Controller for Off-line
Power Supplies
The NCP1250 is a highly integrated PWM controller capable of
delivering a rugged and high performance offline power supply in a
tiny TSOP6 or PDIP8 package. With a supply range up to 28 V, the
controller hosts a jittered 65 kHz or 100 kHz switching circuitry
operated in peak current mode control. When the power on the
secondary side starts to decrease, the controller automatically folds
back its switching frequency down to a minimum level of 26 kHz. As
the power further goes down, the part enters skip cycle while limiting
the peak current.
Over Power Protection (OPP) is a difficult exercise especially when
noload standby requirements drive the converter specifications. The
ON proprietary integrated OPP lets you harness the maximum
delivered power without affecting your standby performance simply
via two external resistors. An Over Voltage Protection input is also
combined on the same pin and protects the whole circuitry in case of
optocoupler failure or adverse open loop operation.
Finally, a timerbased shortcircuit protection offers the best
protection scheme, letting you precisely select the protection trip point
irrespective of a loose coupling between the auxiliary and the power
windings.
Features
FixedFrequency 65 or 100 kHz CurrentMode Control Operation
Internal and Adjustable Over Power Protection (OPP) Circuit
Frequency Foldback Down to 26 kHz and SkipCycle in Light Load
Conditions
Internal Ramp Compensation
Internal Fixed 4 ms SoftStart
100 ms TimerBased AutoRecovery ShortCircuit Protection
Frequency Jittering in Normal and Frequency Foldback Modes
Option for AutoRecovery or Latched ShortCircuit Protection
OVP Input for Improved Robustness
Up to 28 V VCC Operation
+300 mA/500 mA Source/Sink Drive Capability
Less than 100 mW Standby Power at High Line
EPS 2.0 Compliant
These are PbFree Devices
Typical Applications
acdc Converters for TVs, Settop Boxes and Printers
Offline Adapters for Notebooks and Netbooks
www.onsemi.com
MARKING
DIAGRAMS
TSOP6
(SOT236)
SN SUFFIX
25xAYWG
1 CASE 318G
G
1
PDIP8
SUFFIX P
Case 626
125xy65
AWL
YYWWG
25x = Specific Device Code
x = A, 2, C, D, 0, 1
y = A or B
A = Assembly Location
WL = Wafer Lot
Y, YY = Year
W, WW = Work Week
G or G = PbFree Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GND 1
6 DRV
FB 2
OPP/Latch 3
5 VCC
4 CS
TSOP6
(Top View)
GND 1
DRV 2
N/C 3
VCC 4
8 OPP/LATCH
7 N/C
6 FB
5 CS
PDIP8
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 3 of this data sheet.
© Semiconductor Components Industries, LLC, 2015
April, 2015 Rev. 10
1
Publication Order Number:
NCP1250/D


  ON Semiconductor Electronic Components Datasheet  

NCP1250 Datasheet

Current-Mode PWM Controller

No Preview Available !

NCP1250 pdf
Vbulk
OVP
OPP
NCP1250
16
25
34
NCP1250
.
.
.
ramp
comp.
Vo u t
Figure 1. Typical Application Example (TSOP6)
PIN DESCRIPTION
Pin N5
PDIP8 TSSOP6
11
62
Pin Name
GND
FB
8 3 OPP/OVP
5 4 CS
4 5 VCC
2 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.
The driver’s output to an external MOSFET gate.
OPTIONS
Controller
NCP1250ASN65T1G
NCP1250BSN65T1G
NCP1250ASN100T1G
NCP1250BSN100T1G
NCP1250BP65G
Frequency
65 kHz
65 kHz
100 kHz
100 kHz
65 kHz
OCP Latched
Yes
No
Yes
No
No
OCP AutoRecovery
No
Yes
No
Yes
Yes
www.onsemi.com
2


Part Number NCP1250
Description Current-Mode PWM Controller
Maker ON Semiconductor
Total Page 24 Pages
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