| 摘要 |
<p>PURPOSE: A voltage generation circuit is provided to prevent noise from being provided to an audible band by a supply ripple. CONSTITUTION: A first switching element(TR1) and a second switching element(TR2) are serially connected between high potential power and low potential power. An error signal generation circuit(30) generates an error signal(Err) according to an output voltage(VOUT) generating in the output terminal. The error signal generation circuit comprises a resistance device(322), a resistance device(324), a voltage source(34), and an amplifier(36). A triangle wave signal generating circuit(40) generates a triangle wave signal(Vramp) in which a level is changed according to a reset signal cycle. A comparison circuit(50) includes an operational amplifier including an inverting input terminal and a non-inverting input terminal. [Reference numerals] (69) Wave shaping circuit; (71) Pulse generation circuit</p> |
