OB2223
High Precision Low Cost MCM Power Switch
GENERAL DESCRIPTION
OB2223 is a high performance, high precision and
low cost PWM Power switch for Non-isolated
buck/ buck-boost and flyback application. It
combines a dedicated current mode PWM
controller (with a high voltage power MOSFET
with SOP8/DIP8 package) and built-in error
amplifier optimized for good overshoot and
dynamic response for low cost and component
count. With precise inner resistor divider, precise
reference of EA ， accurate constant voltage
regulation 12V at universal AC input can be
guaranteed. For high efficiency, oscillator with
frequency-reduction and burst mode control is
implemented. And EMI performance is achieved
with On-Bright proprietary frequency shuffling
technique and soft gate driver design.
OB2223 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, On-Chip OTP,VDD OVP, and UVLO.
OB2223 is offered in SOP8/DIP8 package
TYPICAL APPLICATION
FEATURES
• Low cost and component count buck
application
• Current Mode Control
• Multiple mode control with good dynamic
response
• Oscillator of fixed maximum switching
frequency with frequency-reduction and burst
mode 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
• VDD Under Voltage Lockout with Hysteresis
(UVLO)
• VDD OVP
• On-Chip OTP
APPLICATIONS
Low Power AC/DC offline SMPS for
• Electrical Appliance
• Linear Regulator/RCC Replacement
.
AC IN
VDD
GND
COMP GND
ENB DRAIN
CS DRAIN
DC
OUT
©On-Bright Electronics
Confidential
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Preliminary Datasheet
TEL0755-82584090
