Pwm pulse generating circuit, device having the same, and pwm control method

A device comprising:

• a pulse width modulation (PWM) clock generator to generate a PWM clock signal;
• a detector to detect the frequency of the PWM clock signal and to output a frequency detection signal including whether the frequency of the PWM clock signal is higher than a reference frequency;
• a PWM pulse signal output unit to generate a PWM pulse signal according to a data signal, the PWM clock signal, and the frequency detection signal;
• and
• an analog circuit to be driven according to the PWM pulse signal,
• wherein when the frequency detection signal includes that the frequency of the PWM clock signal is higher than the reference frequency, the PWM pulse signal output unit generates the PWM pulse signal having a predetermined allowable pulse width or a pulse width that is higher than the predetermined allowable pulse width.

A method of controlling an apparatus with a pulse width modulation (PWM), the method comprising:

• setting a frequency detection signal with a detector according to whether a frequency of a detected PWM clock signal is higher than a reference frequency;
• generating a PWM pulse signal with a signal generator according to the frequency detection signal, the detected PWM clock signal, and a data signal;
• and
• controlling the apparatus according to the generated PWM pulse signal.