PT6511A

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PT6511A is a type of DC-DC converter. DC-DC converters are electronic components that convert one form of voltage, such as direct current (DC) or alternating current (AC) to another level of voltage DC or AC. PT6511A is an integrated battery charger with an in-system programmable maximum charge current and float voltage. The product is designed to tolerate input voltage from 7.0V to 28V. The main applications of PT6511A include power supplies for personal and laptop personal computers, notebooks, mobile phones, and other portable powered devices.

Working Principle of PT6511A

The working principle of PT6511A is based on a two stage battery charging process. The first stage is the Constant Current (CC) stage, which charges the battery with a constant current. The second stage is the Constant Voltage (CV) stage, in which the charger will keep the output voltage at a constant level. During the CC stage, the charge current is set by a voltage on the CS pin. The boost switching frequency of the PT6511A is adjustable using external components in order to control the inrush current. The following figure shows the internal block diagram of the PT6511A.

The PT6511A contains an integrated buck-boost DC-DC converter, which can convert an input voltage as low as 7V up to 28V. The output voltage is set by the external comparator and feedback resistor network. The regulator also features an internal PFM controller for low quiescent current (< 100µA) operation. The PT6511A also includes an overvoltage protection (OVP) circuit to protect the battery from an overcharge condition, and an internal current loop to limit the charge current to the programmed setting. The charge current is limited by sensing the voltage drop across the external sense resistors at the battery.

The PT6511A also contains an internal timer to limit the total charge time. The timer setting is determined by the voltage on the On/Off pin. When the timer times out, the charger switches off and the battery is disconnected from the charger. This ensures that the battery is not overcharged and the battery life is maximized.

Applications of PT6511A

PT6511A is a very useful component for DC-DC battery charging applications. It is widely used in power supplies and chargers for personal and laptop personal computers, notebooks, mobile phones and other portable powered devices. It can be used to charge batteries from 7V to 28V. The product is designed to tolerate input voltage from 7.0V to 28V. It comes with an adjustable boost switching frequency for inrush current control and an internal timer for limiting the total charge time.

The PT6511A is also equipped with a programmable maximum charge current and a float voltage setting. The maximum charge current ensures that the battery is not overcharged and the battery life is maximized, while the float voltage setting ensures that the battery is kept in its optimal charge state. All these features make the PT6511A an ideal choice for battery charging applications.

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