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부품번호 | OB2288 기능 |
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기능 | Highly Integrated Current Mode PWM Controller | ||
제조업체 | On-Bright Electronics | ||
로고 | |||
OB2288
Highly Integrated Current Mode PWM Controller
GENERAL DESCRIPTION
OB2288 is a highly integrated current mode PWM
controller. With internal maximum 50% duty cycle
limit, it is very suitable to be used in large power
applications, especially in forward topology.
OB2288 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). OB2288 also features protections
against pin open and short conditions on selected
pins.
Moreover, an internal 1-second restart timer prevents
permanent OLP latch when the supply of the
controller is provided by other DC sources. In
general applications where supply is self biased by
auxiliary winding, this restart timer will never be
triggered.
In OB2288, On-Bright proprietary frequency
shuffling technique together with soft switching
control at the totem pole gate drive output help to
lower the system design barrier to achieve good EMI
performance.
To meet the increasing stringent standby power
requirements at light or no load condition, On-Bright
proprietary “Extended Burst Mode” technology eases
the system design with high performance and without
compromise in audio noise.
OB2288 is offered in SOP-8 and DIP-8 packages.
FEATURES
■ Maximum 50% Duty Cycle Limit
■ 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
■ High Precision Reference Voltage for OTP and
Brownout Protection
■ Power-On Soft Start
■ Internal Synchronized Slope Compensation
■ 1A Peak Current Drive Capability
APPLICATIONS
Offline AC/DC Converter for
■ LCD TV/PC Power Supplies
■ Open-Frame SMPS
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.com/
BLOCK DIAGRAM
OB2288
Highly Integrated 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_8800
Free Datasheet http://www.datasheetlist.com/
4페이지 CHARACTERIZATION PLOT
OB2288
Highly Integrated Current Mode PWM Controller
I_VDD vs Load
6
5
4
3
2
1
0 500 1000 1500 2000
Load(nF)
50KHz
65KHz
100KHz
250
200
150
100
50
0
10
I_RT vs RI
20 30 40
RI(Kohm)
50
150
120
90
60
30
0
10
Fosc vs RI
20 30 40
RI(Kohm)
50
Fosc vs VDD
75
70
65
60
55
50
10 13 16 19 22 25
VDD(V)
I_VDD_Startup vs Temperature
2.0
1.8
1.6
1.4
1.2
1.0
-20
10 40 70 100
Temperature(℃)
130
6.10
VFB_Open vs Temperature
6.05
6.00
5.95
5.90
-20
10 40 70 100
Temperature(℃)
130
©On-Bright Electronics
-7-
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.com/
7페이지 | |||
구 성 | 총 13 페이지수 | ||
다운로드 | [ OB2288.PDF 데이터시트 ] |
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구매 문의 | 일반 IC 문의 : 샘플 및 소량 구매 ----------------------------------------------------------------------- IGBT, TR 모듈, SCR 및 다이오드 모듈을 포함한 광범위한 전력 반도체를 판매합니다. 전력 반도체 전문업체 상호 : 아이지 인터내셔날 사이트 방문 : [ 홈페이지 ] [ 블로그 1 ] [ 블로그 2 ] |
부품번호 | 상세설명 및 기능 | 제조사 |
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |