| 摘要 |
<p>A Boost circuit for an LED backlight driving circuit is disclosed, which comprises a pulse width modulation (PWM) chip (120), a second capacitor (C2) and a signal processing circuit (140). The power pin of the pulse width modulation chip (120) is connected to an input terminal (Vi) for generating a PWM signal. One terminal of the second capacitor (C2) is connected to an output pin of the pulse width modulation chip (120) for filtering the direct current component of the PWM signal. One terminal of the signal processing circuit (140) is connected to the second capacitor (C2), and the other terminal is connected to the gate of a switch transistor (Ql). The signal processing circuit (140) is used for adjusting the PWM signal from which the direct current component has been filtered to generate the corresponding high level and low level.</p> |
