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
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Datasheet
OB_DOC_DS_2226A3
