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OB2287 PDF 데이터시트 : 부품 기능 및 핀배열

부품번호 OB2287
기능 High Performance Current Mode PWM Controller
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OB2287 데이터시트, 핀배열, 회로
OB2287
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2287 is a highly integrated current mode PWM
controller for medium to large power offline flyback
converter applications.
OB2287 enhances On-Bright’s PWM controller
series by offering the Brownout Detection and
Protection (BOP).
OB2287 offers comprehensive protection coverage
including Cycle-by-Cycle current limiting, internal
Power-On Soft Start, VDD Under Voltage Lockout
(UVLO), VDD Over Voltage Protection(OVP), VDD
Clamp, Gate Clamp, Over Load Protection(OLP),
Over Temperature Protection (OTP), Brownout
Protection (BOP). OB2287 also features protections
against pin open and short on selected pins.
On-Bright’s proprietary OCP compensation can
compensate CCM and DCM mode difference when
used in universal AC input applications. Moreover,
an internal 1-second restart timer prevents permanent
OLP latch when the supply of the controller is
provided by other DC sources. In applications where
supply is self biased by auxiliary winding, this restart
timer will not be triggered.
To achieve good EMI performance, On-Bright’s
proprietary built-in frequency shuffling is provided,
together with soft switching control at the totem pole
gate drive output.
To meet the increasing stringent standby power
requirements, in light or No load, OB2287 operates
in On-Bright’s proprietary “Extended Burst Mode”
without audible noise.
OB2287 is offered in SOP-8 and DIP-8 packages.
FEATURES
AC Line Brownout Detection & Protection (BOP)
Latch-off Mode Fault Protection
Internal Restart Timer
All pins floating protection and RI short
protection
Proprietary Extended Burst Mode Control For
Improved Efficiency and Minimum Standby
Power Design
Audio Noise Free Operation
External Programmable PWM Switching
Frequency
Built-in Frequency Shuffling for Better EMI
Internal Leading Edge Blanking
Proprietary OCP Compensation for Universal AC
Input Range
High Precision Reference Voltage for OTP and
Brownout Protection
Power-On Soft Start
Internal Synchronized Slope Compensation
1A Peak Current Drive Sink Capability
APPLICATIONS
Offline AC/DC flyback converter for
Printer
Adaptor
LCD Monitor/TV/PC/Set-Top Box Power
Supplies
Open-frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/




OB2287 pdf, 반도체, 판매, 대치품
BLOCK DIAGRAM
OB2287
High Performance Current Mode PWM Controller
RECOMMENDED OPERATING CONDITION
Symbol
VDD
RI
TA
Parameter
VDD Supply Voltage
RI Resistor Value
Operating Ambient Temperature
Min Max Unit
11.5 25
V
10 40 Kohm
-20 85
oC
©On-Bright Electronics
-4-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/

4페이지










OB2287 전자부품, 판매, 대치품
OB2287
High Performance Current Mode PWM Controller
CHARACTERIZATION PLOTS
UVLO(OFF)(V) vs Temperature(C)
15.50
15.40
15.30
15.20
15.10
15.00
-20
10 40 70 100
Temperature(C)
©On-Bright Electronics
-7-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/

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전력 반도체 판매 ( IGBT, TR 모듈, SCR, 다이오드 모듈 )

휴대전화 : 010-3582-2743


상호 : 아이지 인터내셔날

전화번호 : 051-319-2877, [ 홈페이지 ]



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