OB2298 Datasheet PDF - On-Bright Electronics

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OB2298
On-Bright Electronics

Part Number OB2298
Description PWM Controller
Page 15 Pages


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OB2298
PWM Controller with PFC Standby Control
GENERAL DESCRIPTION
OB2298 is a highly integrated current mode PWM
controller for medium to high power offline flyback
converter applications.
OB2298 integrates PFC IC power supply control
function and shuts down PFC stage at no load or light
load conditions.
To meet the increasing stringent standby power
requirements in light or zero load, OB2298 operates
in On-Bright’s proprietary “extended burst mode”
without audio noise. Constant power limit is achieved
by On-Bright’s proprietary OCP compensation
technique where OCP due to CCM and DCM mode
difference is compensated in universal AC input
applications.
OB2298 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),
Programmable Brownout Protection, All Pins
Floating Protection, and RT Latch triggering feature.
In applications where VDD is supplied by auxiliary
power supply, the built-in 1 second restart timer can
prevent permanent OLP latch. In other applications,
this restart timer will not be triggered.
To achieve good EMI performance, On-Bright’s
proprietary built-in frequency shuffling is provided,
also with soft switching control at the totem pole gate
drive output.
OB2298 is offered in SOP-8 and DIP-8 packages.
FEATURES
Direct Control of PFC
Programmable Brownout Protection
Internal 4ms Power On Soft Start Time
Internal Restart Timer
Pin Floating Protection
Proprietary Extended Burst Mode Control For
Improved Efficiency and Minimum Standby
Power Design
Built-in Frequency Shuffling for Better EMI
Built-in Leading Edge Blanking
Proprietary OCP Compensation for Universal AC
Input Range
Low Startup Current(5uA) and Low Operating
Current (2.3mA)
Built-in Synchronized Slope Compensation
1.0A Peak Current Driving Capability
Audio Noise Free Operation
Convenient High and Low Triggering Level
Latch Off Function
APPLICATIONS
Offline AC/DC flyback converter for
Laptop Power Adaptor
LCD Monitor Power
LCD TV Power and Home Appliance Power
Printer Power
Lighting Power
TYPICAL APPLICATION
©On-Bright Electronics
-1-
Confidential
OB_DOC_DS_9800
Free Datasheet http://www.datasheet4u.com/



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OB2298
PWM Controller with PFC Standby Control
GENERAL INFORMATION
Pin Configuration
The pin map of OB2298 in DIP8 and SOP8 package
is shown as below.
PFCVCC 1
8 VDD
BO 2
7 GATE
RT 3
6 GND
FB 4
5 CS
Ordering Information
Part Number
OB2298AP
Description
DIP8, Pb-free
OB2298CP
SOP8, Pb-free
OB2298CPA
SOP8, Pb-free in Taping
.
Package Dissipation Rating
Package
DIP8
SOP8
RθJA (°C/W)
90
150
Absolute Maximum Ratings
Parameter
VDD Zener Clamp Voltage
VDD Clamp Continuous
Current
BO Input Voltage
RT Input Voltage
FB Input Voltage
CS Input Voltage
Min/Max Operating Junction
Temperature TJ
Min/Max Storage Temperature
Tstg
Lead Temperature (Soldering,
10secs)
Value
30 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.
©On-Bright Electronics
-2-
Confidential
OB_DOC_DS_9800
Free Datasheet http://www.datasheet4u.com/



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Marking Information
OB2298
PWM Controller with PFC Standby Control
TERMINAL ASSIGNMENTS
Pin Num Pin Name
1 PFCVCC
2 BO
3 RT
4 FB
5 CS
6 GND
7 GATE
8 VDD
I/O Description
P This pin is directly connected to the VDD pin (Pin 8) via a low impedance
switch. During the startup sequence, the switch is off thus the power supply
to PFC stage. As soon as the aux. winding is stabilized. The switch is on and
provides power supply to the PFC controller. It goes down at No/Light load
or fault conditions.
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 100ms, PWM output will be
disabled. When brownout is triggered, this pin will disable an internal
current for brownout hysteresis programming.
I Temperature sensing input pin. Connected to a NTC resistor to GND.
Once the voltage of the RT pin drops below a fixed limit of 1.05V, PWM
output will be disabled. When this pin is above 4.0V or below 0.6V, the
PWM controller is latched shutdown.
I Feedback input pin. PWM duty cycle is determined by the voltage level into
this pin and current sense signal level at Pin 5.
I Current sense input pin. Connected to MOSFET current sensing resistor
node.
P Ground
O Totem-pole gate drive output for power MOSFET.
P DC power supply pin.
©On-Bright Electronics
-3-
Confidential
OB_DOC_DS_9800
Free Datasheet http://www.datasheet4u.com/



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BLOCK DIAGRAM
OB2298
PWM Controller with PFC Standby Control
RECOMMENDED OPERATING CONDITION
Symbol
VDD
TA
Parameter
VDD Supply Voltage
Operating Ambient Temperature
Min Max Unit
12 25 V
-20 85
oC
©On-Bright Electronics
-4-
Confidential
OB_DOC_DS_9800
Free Datasheet http://www.datasheet4u.com/



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