OB2273BMP PWM Controller

Updated: 2026-09-16

Overview

The OB2273BMP is a highly integrated PWM controller designed for offline power supply applications. It operates in a quasi-resonant mode, which enhances efficiency and reduces switching losses. The controller is widely adopted in industries requiring compact and energy-efficient power solutions. Its design includes features like built-in soft-start, over-voltage protection (OVP), and under-voltage lockout (UVLO), making it suitable for demanding environments. The OB2273BMP is often found in consumer electronics, industrial power systems, and LED lighting applications.

Structure and Working Principle

The OB2273BMP integrates a high-voltage startup circuit, oscillator, and PWM comparator into a single IC. It operates by modulating the duty cycle of the output signal to regulate power delivery. The quasi-resonant mode minimizes switching noise and improves efficiency. The controller also includes feedback mechanisms to maintain stable output voltages under varying load conditions. This makes it ideal for applications requiring precise power management, such as LED drivers and AC/DC adapters.

Key Features

One of the standout features of the OB2273BMP is its low standby power consumption, often below 75mW. This makes it compliant with energy efficiency standards like Energy Star and EU ErP. Additional features include cycle-by-cycle current limiting, thermal shutdown, and frequency jittering to reduce EMI. These attributes contribute to its reliability and longevity in high-stress applications.

Application Areas

The OB2273BMP is extensively used in AC/DC power supplies for consumer electronics, such as set-top boxes and routers. Its efficiency and compact design also make it popular in LED lighting systems, where energy savings are critical. Industrial applications include power adapters for machinery and equipment. The controller's robustness ensures consistent performance even in harsh operating conditions.

Maintenance and Precautions

To ensure optimal performance, proper heat dissipation is essential. Using a heatsink or ensuring adequate airflow can prevent overheating. Additionally, designers should adhere to the specified voltage and current limits to avoid damaging the IC. Regular testing under load conditions is recommended to verify stability. Avoiding excessive moisture and static discharge during handling can further extend the controller's lifespan.

B2B Procurement Guide

When sourcing the OB2273BMP, consider purchasing from authorized distributors to guarantee authenticity. Bulk orders typically offer cost savings, with prices ranging from $0.50 to $2.00 per unit depending on quantity. Verify that the supplier provides technical support and datasheets. Checking for RoHS compliance is also advisable to meet environmental regulations. Lead times and minimum order quantities (MOQs) should be confirmed in advance.