TOP209PN

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The TOP209PN is a basic low power off-line switcher IC that provides a constant switching frequency, regulated output voltage and up to 1.0 Amps of load current driving capability. It contains all of the control, protection and drive elements required for a cost-efficient, single-ended, primary-side regulation off-line power supply. The TOP209PN increases reliability by reducing external components like optocouplers, transformer, and external sense resistor. This feature makes the power supply design simpler and more efficient. The TOP209PN is an ideal choice for cost-sensitive, low-power applications.

The TOP209PN operates in two modes, discontinuous and continuous conduction mode (DCM). DCM is for operating in light-load to reduce the power consumption. The device contains advanced features such as valley lockout hysteresis control, valley current mode accuracy, soft-start, automatic power limit (APL), double frequency, frequency foldback. It also provides auto-recovery protection such as overvoltage protection, undervoltage protection, overcurrent protection, input open/short circuit, output open/short circuit, and over temperature protection.

The TOP209PN is designed to operated with a wide range of input voltages from 85VAC to 305VAC or 115VDC to 305VDC depending on the power requirements. It has the ability to drive a single ended flyback transformer with a suitable output voltage from 3.3V up to 24V. The power efficiency of the TOP209PN is more than 80% at nominal line, minimum load, and full load conditions. It has a high power-density capability that operates at high temperature and low cost.

These are the typical applications for the TOP209PN:

• Laptop and desktops adapters
• AC/DC adapters for consumer electronic devices
• TV and monitors power adapters
• Adaptors for mobile or cordless phones
• Chargers for battery operated devices
• AC/DC doorbells
• Battery Chargers

The working principle of the TOP209PN is based on a single ended forward topology that can provide up to 1.0A of load current. It uses a primary side regulation technique to control the output voltage without the need of a secondary side controller. The heavy duty PWM control logic allows a wide range of input and output voltages and supports pulse-by-pulse current limit protection. The output voltage is regulated by the on-chip transistor, current sense amplifier and reference voltage. A feedback pin is used for the output voltage regulation.

The constant off-time current mode control and the internal pulse-by-pulse current limit circuit for the primary side are used for providing the overload protection. The TOP209PN also includes protection circuits such as overvoltage protection, undervoltage protection, overcurrent protection, input open/short circuit and output open/short circuit. The thermal shutdown circuit will shut down the device when the temperature exceeds the maximum junction temperature.

The TOP209PN is an advanced low cost power switcher with features such as high power-density and low stand-by power at high temperature. It operates at a wide range of input voltages and provides protection features such as overvoltage and overcurrent protection. Its single-ended forward topology is ideal for cost-sensitive and low-power applications due to its high power efficiency and fewer external components.

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