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OB2287 Schematic ( PDF Datasheet ) - On-Bright Electronics

Teilenummer OB2287
Beschreibung High Performance Current Mode PWM Controller
Hersteller On-Bright Electronics
Logo On-Bright Electronics Logo 




Gesamt 13 Seiten
OB2287 Datasheet, Funktion
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 Datasheet, Funktion
OB2287
High Performance Current Mode PWM Controller
F_shuffle
f_Temp
f_VDD
Dmax
Dmin
RI_range
V_RI_open
F_BM
Frequency shuffling
cycling frequency
Frequency
Temperature Stability
Frequency Voltage
Stability
Maximum Duty cycle
Minimum Duty cycle
Operating RI Range
RI open voltage
Burst Mode Base
Frequency
Gate Drive Output
VOL
Output Low Level
VOH
Output High Level
VG_Clamp
Output Clamp
Voltage Level
T_r Output Rising Time
T_f Output Falling Time
Over Temperature Protection
I_RT
Output Current of RT
pin
VTH_OTP
OTP Threshold
Voltage
VTH_OTP_off
OTP Recovery
Threshold Voltage
VTH_RT_latch
RT Input Latch
Threshold Voltage
TD_OTP
OTP De-bounce Time
V_RT_Open
RT Pin Open Voltage
Brownout Section
Vth_BO
Brownout comparator
threshold
TD_BO
Brownout debounce
time
IBO_hys
BO output current for
BO hysteresis
programming
Restart Timer Section
RST_auto
Auto recovery Restart
timer
-20oC to 100 oC
VDD = 12-28V,
Io = 30 mA (sink)
Io = 30 mA (source)
CL = 1nf
CL = 1nf
VDD = 18V
VDD = 18V
VDD = 18V
VDD=18V
VDD = 18V
VDD = 18V
32 Hz
3%
3%
75 80 85 %
- - 0%
10 20 40 Kohm
2.0 V
22 KHZ
0.3 V
11 V
18 V
70 nSec
30 nSec
100 uA
1.015 1.05 1.115 V
1.15 V
0.6 V
100 uSec
3.2 V
1 1.05 1.1 V
50 ms
2 uA
1 Sec
©On-Bright Electronics
-6-
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/

6 Page









OB2287 pdf, datenblatt
8-Pin Plastic SOP
OB2287
High Performance Current Mode PWM Controller
©On-Bright Electronics
- 12 -
Confidential
OB_DOC_DS_8700
Free Datasheet http://www.datasheetlist.com/

12 Page





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