OB2222M

GENERAL DESCRIPTION

OB2222M is a high performance, high precision and low cost PM Power switch for non-isolated buck and buck-boost application. It combines a dedicated current mode PM controller with a high voltage power Bipolar in SOP8 package. Its built-in error amplifier is optimized for good overshoot and dynamic response for low cost and component count. With precise inner resistor divider, precise reference of EA constant voltage regulation of 5.0V at universal AC input can be guaranteed. Frequency reduction and burst mode control is implemented for high efficiency at light load. Good EMI performance is achieved with On-Bright proprietary frequency shuffling technique and soft base driver design.

Low startup current and low operating current contribute to a reliable power on startup and low standby power consumption with

OB2222M.

Constant power operation is supported at over load application with OB2222M, which makes it suitable for small home appliance application where instant large power consumption is required such as start-up of a fan.

OB2222M offers power on soft start control and protection coverage with auto-recovery features including cycle-by-cycle current limiting. output

short

circuit protection,

FB pin open loop

protection, on-chip Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP), and DD Under Voltage Lockout Protection (UVLO).

The tone energy at below 20KHz is minimized in the design so that audio noise is eliminated during operation.

OB2222M is offered in SOP8 package.

FEATURES

Universal AC input ran voltage

Constant power mode o application

Low cost and less BOM boost applications

Current mode control

40kHz (typical) maximum

Frequency-reduction and for high efficiency

Frequency shuffling for EMI

Power on soft-start

Built-in Leading Edge Blanki

Cycle-by-cycle current limitin

FB pin open loop protection

Output short-circuit protection

VDD Under Voltage Lockout

VDD OVP

On-Chip OTP.

APPLICATIONS

Low power AC/DC offline SMPS for

Small home appliance

• Linear regulator/RCC replacement