This the control of the circuit is used to detect the output voltage level and generates a driving signal to turn on or turn off on the power switch (SW). The power switch can be controlled by using different methods, such as pulse width modulation (PWM), pulse frequency modulation (PFM), or pulse skipping modulation (PSM), depends on the applications. As for the output voltage stability, it is maintained by controlling the duty cycle without losing energy. This may be illustrated by examining the energy stored in the inductor.
The Figure is in below;
The input electric energy is delivered to the load and partially stored in an inductor during the power switch turned on. The stored energy will be also transferred to the load through a free-wheel diode during the power switch turned off. PWM control method is used to illustrate the relationship between input and output voltage. It can also be applied to both PFM and PSM. To prevent the inductor from saturation, the inductor must release the same amount of energy as is stored under the stable condition. If not so, the inductor will enter a saturation region and lose its capability of storing energy due to unbalanced energy. The working voltage of AIC1563 is between 3V and 30V. It is recommended to operate it between 50KHz and 100KHz to obtain an optimum performance, although its operating frequency is ranging from 10 Hz to 100 kHz. AIC1563 is controlled by pulse skipping modulation (PSM). The main voltage source required for the electronic system products such as video CD, DVD, modem, and scanner is either 5 V or 12 V, with a maximum current of 1 A. We take this as an example to design a 5V/1A constant voltage DC/DC converter.
The Figure is in below;
The input electric energy is delivered to the load and partially stored in an inductor during the power switch turned on. The stored energy will be also transferred to the load through a free-wheel diode during the power switch turned off. PWM control method is used to illustrate the relationship between input and output voltage. It can also be applied to both PFM and PSM. To prevent the inductor from saturation, the inductor must release the same amount of energy as is stored under the stable condition. If not so, the inductor will enter a saturation region and lose its capability of storing energy due to unbalanced energy. The working voltage of AIC1563 is between 3V and 30V. It is recommended to operate it between 50KHz and 100KHz to obtain an optimum performance, although its operating frequency is ranging from 10 Hz to 100 kHz. AIC1563 is controlled by pulse skipping modulation (PSM). The main voltage source required for the electronic system products such as video CD, DVD, modem, and scanner is either 5 V or 12 V, with a maximum current of 1 A. We take this as an example to design a 5V/1A constant voltage DC/DC converter.
