Abstract: A temperature control circuit for a battery charger includes a counter and a digital to analog converter for adjusting a current output of the charger based on a value stored in the counter. A first comparator increments or decrements the counter based on the difference between the temperature of the charger and a desired temperature. A reset circuit zeros the counter when the temperature of the charger has exceeded an upper threshold and subsequently maintains the counter at zero until the temperature of the charger has fallen below a lower threshold.

Abstract: A temperature control circuit for a battery charger includes a counter and a digital to analog converter for adjusting a current output of the charger based on a value stored in the counter. A first comparator increments or decrements the counter based on the difference between the temperature of the charger and a desired temperature. A reset circuit zeros the counter when the temperature of the charger has exceeded an upper threshold and subsequently maintains the counter at zero until the temperature of the charger has fallen below a lower threshold.

Abstract: A method for controlling a switching power regulator uses a function of two voltages to dynamically adjust the regulator's duty cycle. The first voltage VFB corresponds to the output current of the regulator. The second voltage is an independently generated modulated reference voltage VREF. A clock signal causes the regulator to enter a charging phase. That phase is maintained until VREF no longer exceeds VFB. At that point, a discharge phase is initiated. Selecting an appropriate waveform for VREF yields a regulator with a well behaved output without the need for inner and outer control loops. This enhances transient response and low power efficiency.

Abstract: A method for pulse modulation control of switching regulators includes positioning a series of parallel FET-type switches (high-side switches) between the input side of an inductor and the voltage supply. A second parallel series of FET-type switches (low-side switches) are used to connect the input side of the inductor to ground. A control module enables one or more of the high-side switches at the start of each switching cycle. The enabled high side switches remain enabled until the output of the buck-type switching regulator is within regulation or a current limit through the high-side switches has been exceeded. The control module then disables all high-side switches and enables an equivalent number of low-side switches. The low-side switches remain enabled until the output has fallen below regulation or current has ceased to flow from the inductor to the load of the regulator.

Abstract: A method for pulse modulation control of switching regulators includes positioning a series of parallel FET-type switches (high-side switches) between the input side of an inductor and the voltage supply. A second parallel series of FET-type switches (low-side switches) are used to connect the input side of the inductor to ground. A control module enables one or more of the high-side switches at the start of each switching cycle. The enabled high side switches remain enabled until the output of the buck-type switching regulator is within regulation or a current limit through the high-side switches has been exceeded. The control module then disables all high-side switches and enables an equivalent number of low-side switches. The low-side switches remain enabled until the output has fallen below regulation or current has ceased to flow from the inductor to the load of the regulator.

Abstract: A circuit is provided to regulate an output voltage. The circuit includes an upper transistor connected to an input voltage from a voltage source, a lower transistor connected to the upper transistor, a pulse width modulator for generating control signals for the upper and lower transistors and a voltage protection circuit. The voltage protection circuit includes an over-voltage detector circuit powered by the regulated voltage. The voltage protection circuit can cause the lower transistor to draw sufficient current from the voltage source such that an over-voltage condition becomes abated.

Abstract: In an embodiment of the invention a circuit is used for providing a regulated voltage. The circuit comprises an upper transistor connected to an input voltage from a voltage source, a lower transistor connected to the upper transistor, a pulse width modulator for generating control signals for the upper and lower transistors and a voltage protection circuit. The voltage protection circuit comprises an over-voltage detector circuit powered by the regulated voltage. The voltage protection circuit can cause the lower transistor to draw sufficient current from the voltage source such that an over-voltage condition becomes abated.