OB2269C PDF Datasheet浏览和下载

型号.:
OB2269C
PDF下载:
下载PDF文件
内容描述:
电流模式PWM控制器
[current mode pwm controller]
文件大小:
353 K
文件页数:
13 Pages
品牌Logo:
品牌名称:
未知厂家 [ ETC ]
PCB Prototype
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OB2269C
Current Mode PWM Controller
Frequency Shuffling
GENERAL DESCRIPTION
OB2269C is a highly integrated current mode PWM
control IC optimized for high performance, low
standby power and cost effective offline flyback
converter applications.
PWM switching frequency at normal operation is
externally programmable and trimmed to tight range.
At no load or light load condition, the IC operates in
extended ‘burst mode’ to minimize switching loss.
Lower standby power and higher conversion
efficiency is thus achieved.
VDD low startup current and low operating current
contribute to a reliable power on startup design with
OB2269C. A large value resistor could thus be used
in the startup circuit to minimize the standby power.
The internal slope compensation improves system
large signal stability and reduces the possible sub-
harmonic oscillation at high PWM duty cycle output.
Leading-edge blanking on current sense input
removes the signal glitch due to snubber circuit diode
reverse recovery. This greatly helps to reduce the
external component count and system cost in
application.
OB2269C offers complete protection coverage with
automatic self-recovery feature including Cycle-by-
Cycle current limiting (OCP), over load protection
(OLP), over temperature protection (OTP), VDD
over voltage protection (OVP) and under voltage
lockout (UVLO). The Gate-drive output is clamped
at 18V to protect the power MOSFET.
In OB2269C, OCP threshold slope is internally
optimized to reach constant output power limit over
universal AC input range.
Excellent EMI performance is achieved with On-
Bright proprietary frequency shuffling technique
together with soft switching control at the totem pole
gate drive output.
The tone energy at below 20KHZ is minimized in
operation. Consequently, audio noise performance is
greatly improved.
OB2269C is offered in both SOP-8 and DIP-8
packages.
nt
ia
l
On-Bright Proprietary Frequency Shuffling
Technology for Improved EMI Performance
Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power Design
Audio Noise Free Operation
External
Programmable PWM Switching
Frequency
Internal Synchronized Slope Compensation
Low VIN/VDD Startup Current(6.5uA) and Low
Operating Current (2.3mA)
Leading Edge Blanking on Current Sense Input
Complete Protection Coverage With Auto Self-
Recovery
o
External Programmable Over Temperature
Protection (OTP)
o
With or Without On-chip VDD OVP for
System OVP
o
Under Voltage Lockout with Hysteresis
(UVLO)
o
Gate Output Maximum Voltage Clamp (18V)
o
Line Compensated Cycle-by-Cycle Over-
current Threshold Setting For Constant Output
Current Limiting Over Universal Input Voltage
Range (OCP)
o
Over Load Protection. (OLP)
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On
-
Br
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©On-Bright Electronics
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TYPICAL APPLICATION
Co
to
APPLICATIONS
Offline AC/DC flyback converter for
Laptop Power Adaptor
PC/TV/Set-Top Box Power Supplies
Open-frame SMPS
Battery Charger
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(志
Confidential
OB_DOC_DS_69CC1
)
FEATURES