DataSheetWiki


NCP1251 fiches techniques PDF

ON Semiconductor - Current-Mode PWM Controller

Numéro de référence NCP1251
Description Current-Mode PWM Controller
Fabricant ON Semiconductor 
Logo ON Semiconductor 





1 Page

No Preview Available !





NCP1251 fiche technique
NCP1251
Current-Mode PWM
Controller for Off-line
Power Supplies
The NCP1251 is a highly integrated PWM controller capable of
delivering a rugged and high performance offline power supply in a
tiny TSOP−6 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
no−load 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. A latched Over Voltage Protection (OVP) is
combined on the same pin. For ease of implementation, a latched OVP
also monitors the VCC line. They offer an efficient protection in case
of optocoupler destruction or adverse open loop operation.
Finally, a timer−based short−circuit 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
Fixed−Frequency 65 or 100 kHz Current−Mode Control Operation
Internal and Adjustable Over Power Protection (OPP) Circuit
Frequency Foldback Down to 26 kHz and Skip−Cycle in Light Load
Conditions
Internal Ramp Compensation
Internal Fixed 4 ms Soft−Start
100 ms Timer−Based Auto−Recovery Short−Circuit Protection
Frequency Jittering in Normal and Frequency Foldback Modes
Option for Auto−Recovery or Latched Short−Circuit Protection
OVP Input for Improved Robustness
Up to 28 V VCC Operation
Latched OVP Protection on VCC
+300 mA / −500 mA Source/Sink Drive Capability
Less than 100 mW Standby Power at High Line
EPS 2.0 Compliant
These are Pb−Free Devices
Typical Applications
ac−dc Converters for TVs, Set−top Boxes and Printers
Offline Adapters for Notebooks and Netbooks
http://onsemi.com
MARKING
DIAGRAM
TSOP−6
(SOT23−6)
5xyAYWG
SN SUFFIX
G
1
CASE 318G
1
STYLE 13
5xy = Specific Device Code
x = A or U
y = A, 2, C, or D
A = Assembly Location
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
GND 1
6 DRV
FB 2
OPP/Latch 3
5 VCC
4 CS
(Top View)
ORDERING INFORMATION
See detailed ordering, marking and shipping information in the
package dimensions section on page 2 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
December, 2014 − Rev. 11
1
Publication Order Number:
NCP1251/D

PagesPages 24
Télécharger [ NCP1251 ]


Fiche technique recommandé

No Description détaillée Fabricant
NCP1250 Current-Mode PWM Controller ON Semiconductor
ON Semiconductor
NCP1251 Current-Mode PWM Controller ON Semiconductor
ON Semiconductor
NCP1252 Current Mode PWM Controller ON Semiconductor
ON Semiconductor
NCP1253 Current-Mode PWM Controller ON Semiconductor
ON Semiconductor

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche