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OB2226 데이터시트 PDF




On-Bright Electronics에서 제조한 전자 부품 OB2226은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 OB2226 기능
기능 High Precision Low Cost MCM Power Switch
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OB2226 데이터시트, 핀배열, 회로
OB2226
High Precision Low Cost MCM Power Switch
GENERAL DESCRIPTION
OB2226 is a high performance, high precision and
low cost PWM Power switch for non-isolated buck
application. It combines a dedicated current mode
PWM controller (with a high voltage power
MOSFET with DIP7 package) and built-in error
amplifier for low cost and component count. With
precise inner resistor divider, precise reference of
EA and load compensation, accurate constant
voltage regulation at universal AC input can be
guaranteed. For high efficiency, oscillator with
frequency-reduction control is implemented. And
EMI performance is achieved with On-Bright
proprietary frequency shuffling technique.
OB2226 offers power on soft start control and
protection coverage with auto-recovery features
including Cycle-by-Cycle current limiting, over
loading protection, output short-circuit protection,
over temperature protection, VDD OVP, and
UVLO.
OB2226 is offered in SOP8 or DIP7 package.
FEATURES
Low cost and component count buck
application
Built-in error amplifier
Load compensation
Oscillator of fixed frequency with frequency-
reduction control for high efficiency
Frequency shuffling for EMI improvement
Power on Soft-start
Built-in Leading Edge Blanking (LEB)
Cycle-by-Cycle Current Limiting
Over Loading Protection
Output Short-Circuit Protection
Over Temperature Protection
VDD Under Voltage Lockout with Hysteresis
(UVLO)
VDD OVP
APPLICATIONS
Low Power AC/DC offline SMPS for
Electrical Appliance
Linear Regulator/RCC Replacement
TYPICAL APPLICATION
AC IN
VDD
GND
COMP GND*
NC DRAIN
CS DRAIN
Note : GND* Only in SOP8 package
DC
OUT
©On-Bright Electronics
Confidential
-1-
Datasheet
OB_DOC_DS_2226A3




OB2226 pdf, 반도체, 판매, 대치품
BLOCK DIAGRAM
OVP
OB2226
High Precision Low Cost MCM Power Switch
©On-Bright Electronics
Confidential
-4-
Datasheet
OB_DOC_DS_2226A3

4페이지










OB2226 전자부품, 판매, 대치품
OB2226
High Precision Low Cost MCM Power Switch
OPERATION DESCRIPTION
OB2226 is a cost effective PWM power switch
optimized for off-line non-isolated buck
applications including electrical appliance and
linear regulator replacement. It operates in current
mode and regulates output voltage with dedicated
features. High integration can afford low cost and
component count solution.
Startup Current and Start up Control
Startup current of OB2226 is designed to be very
low so that VDD could be charged up above
UVLO threshold and starts up quickly. A large
value startup resistor can therefore be used to
minimize the power loss in application.
Operating Current
The Operating current of OB2226 is as low as
1.5mA (typical). Good efficiency is achieved with
the low operating current together with ‘Multi-
mode’ control features.
Oscillator operation
The switching frequency of OB2226 is internally
fixed at 45KHz (typical). No external frequency
setting components are required for PCB design
simplification.
At light load or zero load condition, most of the
power dissipation in a switching mode power
supply is from switching loss on the MOSFET.
The magnitude of power loss is in proportion to
the switching frequency. Lower switching
frequency leads to the reduction on the power
loss and thus conserves the energy. The
switching frequency is internally adjusted at light
load or no load condition. The switch frequency
reduces at light/no load condition to improve the
conversion efficiency. The minimum switching
frequency is 400Hz (typical).
Frequency shuffling for EMI improvement
The frequency shuffling (switching frequency
modulation) is implemented in OB2226. The
oscillation frequency is modulated so that the tone
energy is spread out. The spread spectrum
minimizes the conduction band EMI and therefore
eases the system design.
Built-in error amplifier
In OB2226, on-chip EA (error amplifier) is
implemented to regulate output voltage. Through
inner resistor divider, the VDD voltage is detected
at inverter input of EA to regulate output voltage.
Load Compensation for good CV
regulation
In OB2226, load compensation is implemented to
achieve good load regulation. An offset voltage is
generated at inverter input of EA by an internal
current flowing into the resister divider. The
current is inversely proportional to the voltage
across pin COMP, as a result, it is inversely
proportional to the output load current, therefore
the output voltage can be compensated specially
in zero loading condition. As the load current
decreases from full-load to no-load, the offset
voltage at inverter input of EA will increase.
Current Sensing and Leading Edge
Blanking
Cycle-by-Cycle current limiting is offered in
OB2226 current mode PWM control. The switch
current is detected by a sense resistor into the CS
pin. An internal leading edge blanking circuit
chops off the sensed voltage spike at initial
internal power MOSFET on state so that the
external RC filtering on sense input is no longer
needed. The PWM duty cycle is determined by
the current sense input voltage and the EA output
voltage.
Gate Driver
The internal power MOSFET in OB2226 is driven
by a dedicated gate driver for power switch control.
Too weak the gate driver strength results in higher
conduction and switch loss of MOSFET while too
strong gate drive compromises EMI.
A good tradeoff is achieved through the built-in
totem pole gate design with right output strength
control.
Protection Control
Good power supply system reliability is achieved
with its rich protection features including Cycle-by-
Cycle current limiting (OCP), Over Loading
Protection, Over Voltage Protection, Output Short-
Circuit Protection and Under Voltage Lockout on
VDD (UVLO). To prevent from any lethal thermal
damage, OB2226 stops switching when the
junction temperature exceeds 150℃(typical.
When the junction temperature drops below 130
typical, OB2226 resumes operation.
©On-Bright Electronics
Confidential
-7-
Datasheet
OB_DOC_DS_2226A3

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