OB2229P is a high performance, high precision and low cost PWM Power switch for non-isolated buck and buck-boost application. It combines a dedicated current mode PWM controller with a high voltage power MOSFET 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 19.7V 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 gate driver design. Low startup current and low operating current contribute to a reliable power on startup and low standby power consumption with OB2229P.
OB2229P offers power on soft start control and protection coverage with auto-recovery features including cycle-by-cycle current limiting, output short circuit protection, on-chip Over Temperature Protection (OTP), VDD Over Voltage Protection (OVP), Over Loading Protection(OLP) and VDD Under Voltage Lockout Protection (UVLO).
The tone energy at below 25KHz is minimized in the design so that audio noise is eliminated during operation.
OB2229P is offered in SOP8 package.
· Universal AC input range and 19.7V output voltage
· Low cost and less BOM for buck and buck-boost applications
· Current mode control
· 50kHz (typical) maximum switching frequency
· 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
· Output short-circuit protection
· VDD Under Voltage Lockout with Hysteresis
· VDD OVP
· Over Loading Protection
· On-Chip OTP
Low power AC/DC offline SMPS for
· Intelligent breaker
· Motor drive
· Linear regulator/RCC replacement
The pin map is shown as below for SOP8
SOP8, Halogen-free in Tube
SOP8, Halogen-free in T&R
Package Dissipation Rating
Note: Drain Pin Connected 100mm2 PCB copper clad.
Output Power Table
Notes: 1. Maximum practical continuous power in an open frame design with sufficient drain pattern as a heat sink, at 50℃ ambient.
Absolute Maximum Ratings
Drain Voltage(off state)
-0.3V to Bvdss
-0.3 to 24V
CS Input Voltage
-0.3 to 7V
Min/Max Operating Junction Temperature TJ
-40 to 150 ℃
Operating Ambient Temperature TA
-40 to 85 ℃
Min/Max Storage Temperature Tstg
-55 to 150 ℃
Lead Temperature (Soldering, 10secs)
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.
Recommended Operating Condition
VDD Supply Voltage
9 to 18V
Power Supply and Output Voltage Feedback
PWM Enable Control
Current sense input
Power Mosfet Drain pins.