OB2276A PDF даташит
Спецификация OB2276A изготовлена «On-Bright Electronics» и имеет функцию, называемую «High Performance Current Mode PWM Controller». |
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Детали детали
Номер произв | OB2276A |
Описание | High Performance Current Mode PWM Controller |
Производители | On-Bright Electronics |
логотип |
11 Pages
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OB2276A
High Performance Current Mode PWM Controller
GENERAL DESCRIPTION
OB2276A 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
internally fixed and is 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 and low
standby design with OB2276A.
OB2276A offers complete protection coverage
with auto-recovery including Cycle-by-Cycle
current limiting (OCP), over load protection (OLP),
Brownout protection, VDD over voltage protection
(OVP), over temperature protection (OTP), output
over voltage protection and VDD under voltage
lockout (UVLO). Excellent EMI performance is
achieved with On-Bright proprietary frequency
shuffling technique.
The tone energy at below 22KHZ is minimized in
the design and audio noise is eliminated during
operation.
OB2276A is offered in SOP8 package.
TYPICAL APPLICATION
FEATURES
■ Power on Soft Start Reducing MOSFET Vds
Stress
■ Frequency shuffling for EMI
■ Extended Burst Mode Control For Improved
Efficiency and Minimum Standby Power
Design
■ Audio Noise Free Operation
■ Fixed 65KHZ Switching Frequency
■ Comprehensive Protection Coverage
o VDD Under Voltage Lockout with
Hysteresis (UVLO)
o Cycle-by-cycle over current threshold
setting for constant output power limiting
over universal input voltage range
o Overload Protection (OLP) with auto-
recovery
o Brownout Protection with auto-recovery
o VDD OVP with auto-recovery
o Over Temperature Protection with auto-
recovery
o Output Over Voltage Protection with auto-
recovery
APPLICATIONS
Offline AC/DC flyback converter for
■ Battery Charger
■ Power Adapter
■ Set-Top Box Power Supplies
■ Open-frame SMPS
©On-Bright Electronics
Confidential
-1-
Preliminary Datasheet
OB_DOC_DS_2276A00
No Preview Available ! |
OB2276A
High Performance Current Mode PWM Controller
GENERAL INFORMATION
Pin Configuration
The OB2276A is offered in SOP8 package, shown
as below.
VCC
1
8 Demag
GND
2
7 FB
GATE
3
CS 4
6 RT
5 BO
Ordering Information
Part Number
OB2276ACP
Description
SOP8, Pb-free in Tube
OB2276ACPA
SOP8, Pb-free in T&R
Package Dissipation Rating
Package
RJA(℃/W)
SOP8
150
Absolute Maximum Ratings
Parameter
VDD DC Supply Voltage
Value
VOVP-1V
VDD Zener Clamp
VoltageNote
VDD_Clamp+0.1V
VDD DC Clamp Current 10 mA
FB Input Voltage
-0.3 to 7V
Sense Input Voltage
-0.3 to 7V
BO Input Voltage
-0.3 to 7V
RT Input Voltage
-0.3 to 7V
Min/Max Operating
Junction Temperature TJ
-40 to 150 ℃
Min/Max Storage
Temperature Tstg
-55 to 150 ℃
Lead Temperature
(Soldering, 10secs)
260 ℃
Note: VDD_Clamp has a nominal value of 34V.
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.
OB2276A X X X
Current Mode PWM Controller with
auto-recovery
Package
C:SOP8
Package Pb-free
P:Pb-free
Packing
Blank:Tube
A: Tape/Reel
©On-Bright Electronics
Confidential
2
Preliminary Datasheet
OB_DOC_DS_2276A00
No Preview Available ! |
Marking Information
OB2276A
High Performance Current Mode PWM Controller
TERMINAL ASSIGNMENTS
Pin Name
VCC
GND
Gate
CS
BO
RT
FB
Demag
I/O Description
P Power Supply
P Ground
O Totem-pole gate driver output for power Mosfet
I Current sense input
I
Line voltage detection pin. Depends on voltage at this pin, Brownout is triggered or
not.
I Connected through a NTC resistor to ground for over temperature control.
I
Feedback input pin. The PWM duty cycle is determined by voltage level into this pin
and the current-sense signal at Pin 4.
I
Output detection pin through winding of transformer for output over voltage
protection
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min/Max
12 to 27
-20 to 85
Unit
V
℃
©On-Bright Electronics
Confidential
-3-
Preliminary Datasheet
OB_DOC_DS_2276A00
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Номер в каталоге | Описание | Производители |
OB2276 | High Performance Current Mode PWM Controller | On-Bright |
OB2276A | High Performance Current Mode PWM Controller | On-Bright Electronics |
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