OB2287 Datasheet PDF - On-Bright Electronics

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OB2287
On-Bright Electronics

Part Number OB2287
Description High Performance Current Mode PWM Controller
Page 13 Pages


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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/



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OB2287
High Performance Current Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
The pin map of OB2287 in DIP8 and SOP8 package
is shown as below.
Ordering Information
Part Number
OB2287AP
OB2287CP
Description
DIP8, Pb-free
SOP8, Pb-free
Note: All Devices are offered in Pb-free Package if not otherwise
noted.
Package
DIP8
SOP8
RθJA (°C/W)
90
150
Absolute Maximum Ratings
Parameter
VDD Clamp Voltage
VDD Clamp Continuous
Current
VFB Input Voltage
VSENSE Input Voltage to Sense
Pin
VRT Input Voltage to RT Pin
VRI Input Voltage to RI Pin
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
Value
31 V
10 mA
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-0.3 to 7V
-20 to 150 oC
-55 to 150 oC
260 oC
Note: Stresses beyond those listed under “absolute maximum
ratings” may cause permanent damage to the device. These are
stress ratings only, functional operation of the device at these or
any other conditions beyond those indicated under “recommended
operating conditions” is not implied. Exposure to absolute
maximum-rated conditions for extended periods may affect device
reliability.
Package Dissipation Rating
©On-Bright Electronics
-2-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/



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Marking Information
OB2287
High Performance Current Mode PWM Controller
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 GND
2 FB
3 BO
4 RI
5 RT
6 SENSE
7 VDD
8 GATE
I/O Description
P Ground
I Feedback input pin. PWM duty cycle is determined by voltage level into this
pin and current-sense signal level at Pin 6.
I/O Connected a resistor divider from line voltage to this pin to detect line
voltage. If this pin drops below 1.05V and lasts 50ms, PWM output will be
disabled. When brownout is triggered, this pin will source an internal
trimmed current for brownout hysteresis programming.
I Internal Oscillator frequency setting pin. A resistor connected between RI
and GND sets the PWM frequency.
I Dual function pin. Either connected through a NTC resistor to GND for over
temperature protection control or used as the latch shutdown control input.
I Current sense input pin. Connected to MOSFET current sensing resistor
node.
P DC power supply pin.
O Totem-pole gate drive output for power MOSFET.
©On-Bright Electronics
-3-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/



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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/



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