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PDF OB2287 Data sheet ( Hoja de datos )
| Número de pieza | OB2287 | |
| Descripción | High Performance Current Mode PWM Controller | |
| Fabricantes | On-Bright Electronics | |
| Logotipo |  |
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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/
1 page  
OB2287
High Performance Current Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, RI=20K ohm, VDD=16V, if not otherwise noted)
Symbol
Parameter
Supply Voltage (VDD) Section
I_VDD_Startup VDD Start up Current
I_VDD_Ops
UVLO(Enter)
UVLO(Exit)
OVP(Latch)
OVP(De-Latch)
I(Vdd)_latch
TD_OVP
VDD_Clamp
T_Softstart
Operation Current
VDD Under Voltage
Lockout Enter
VDD Under Voltage
Lockout Exit
(Startup)
VDD Over Voltage
Latch Trigger
VDD Latch Release
Voltage Threshold
VDD bleeding current
at latch shutdown
when VDD = 8V
VDD OVP Debounce
time
VDD Zener Clamp
Voltage
Soft Start Time
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
VFB Open Voltage
Test Conditions
VDD =15V, Measure
current into VDD
VFB=3V
I(VDD ) = 5 mA
ΔVFB /ΔVcs
VDD=18V
Min Typ Max Unit
5 20 uA
2.3 mA
8 9 10 V
14 15 16 V
26.5 28
6.5
45
29.5 V
V
uA
100 uSec
31 V
16 mSec
2.2 V/V
6V
IFB_Short
VTH_0D
VTH_BM
VTH_PL
TD_PL
ZFB_IN
FB pin short circuit
current
Zero Duty Cycle FB
Threshold Voltage
Burst Mode FB
Threshold Voltage
Power Limiting FB
Threshold Voltage
Power limiting
Debounce Time
Input Impedance
VDD=18V, Short FB pin
to GND, measure current
1.1
1.6
4.4
250
6
Current Sense Input(Sense Pin) Section
T_blanking
Sense Input Leading
Edge Blanking Time
VTH_OC_0
Internal current
limiting threshold
TD_OC
Over Current
Detection and Control
Delay
VDD=18V
Zero duty cycle
CL=1nf at GATE,
350
0.68 0.7
70
Oscillator Section
FOSC Normal Oscillation
Frequency
∆F(shuffle)/Fosc Frequency shuffling
range
60 65
-4
mA
1V
V
V
mSec
Kohm
nSec
0.72 V
nSec
70 KHZ
4%
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.d
5 Page 
OB2287
High Performance Current Mode PWM Controller
PACKAGE MECHANICAL DATA
8-Pin Plastic DIP
©On-Bright Electronics
- 11 -
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet OB2287.PDF ] | |
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