OB2288 Datasheet PDF - On-Bright Electronics
Part Number | OB2288 | |
Description | Highly Integrated Current Mode PWM Controller | |
Manufacturers | On-Bright Electronics | |
Logo | ||
There is a preview and OB2288 download ( pdf file ) link at the bottom of this page. Total 13 Pages |
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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/
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OB2288
Highly Integrated Current Mode PWM Controller
ELECTRICAL CHARACTERISTICS
(TA = 25OC, RI=20K ohm, VDD=16V, if not otherwise noted)
Symbol
Parameter
Test Conditions
Supply Voltage (VDD) Section
I_VDD_Startup VDD Startup Current VDD =13.5V
I_VDD_Ops
UVLO(Enter)
Operation Current
VDD Under Voltage
Lockout Enter
VFB=3V
UVLO(Exit)
VDD Under Voltage
Lockout Exit
OVP
VDD Over Voltage
Protection
TD_OVP
VDD OVP Debounce
Time
VDD_De-Latch Latch Release
Voltage Threshold
I_VDD_Latch
VDD Current at
Latch Shutdown
VDD=8V
VDD_Clamp
VDD Zener Clamp
Voltage
I(VDD ) = 15 mA
T_Softstart
Soft Start Time
Feedback Input Section(FB Pin)
AVCS
PWM Input Gain
VFB_Open
FB Pin Open Voltage
ΔVFB /ΔVcs
VDD=18V
Min Typ Max Unit
5 20 uA
2.3 mA
8 9 10 V
14.2 15.2 16.2 V
26 28 30 V
100 uSec
6.5 V
45 uA
31 V
4 mSec
2.2 V/V
6V
IFB_max
FB Pin Maximum
Source Current
VDD=18V, Short FB pin
to GND.
1.1
VFB_TH
Zero Duty Cycle
Threshold Voltage
VDD=9.5V, Vsense=0V 0.9 1
VTH_BM
Burst Mode FB
Threshold Voltage
1.6
VTH_PL
Power Limiting FB
Threshold Voltage
4.4
TD_PL
Power Limiting
Debounce Time
250
ZFB_IN
Input Impedance
6
Current Sense Input(Sense Pin) Section
T_blanking
Sense Input Leading VDD=18V
Edge Blanking Time
300
VTH_OC
Internal Current
Limiting Comparator
Threshold
0.67 0.7
TD_OC
Propagation delay to CL=1nF at GATE
GATE
70
Oscillator Section
FOSC Normal Oscillation
Frequency
∆F(shuffle)/Fosc Frequency Shuffling
Range
60 65
-4
F_shuffle
∆f_Temp
Frequency Shuffling
Cycling Frequency
Frequency
Temperature Stability
-20oC to 100 oC
32
3
mA
1.1 V
V
V
mSec
Kohm
nSec
0.73 V
nSec
70 KHz
4%
Hz
%
©On-Bright Electronics
-5-
Confidential
OB_DOC_DS_8800
Free Datasheet http://www.datasheetlist.co
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for OB2288 electronic component. |
Information | Total 13 Pages | |
Link URL | [ Copy URL to Clipboard ] | |
Download | [ OB2288.PDF Datasheet ] |
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