Diagram Guide

BD5460 is a low power {lass D amplifier that can be employed in low power applications like handheld audio devices. BD5460 doesnt need an LC filter at the speaker output and can be driven employing a battery, The standby current of BA5460 is usually zero and theres no switch on / OFF clicks. The BD5460 can deliver 0.8 watts into an 8 ohm speaker at 3.6 V supply voltage. the power supply voltage range is from 2.5 to 6.5 V DC. The IC contains a built-in standby function, short circuit protection, thermal shutdown and below voltage lockout.

Two class D amplifier circuits using BD5460 are shown here. the first one is a differential input class D amplifier while the second one is a single ended input class D amplifier. The 0.1uF capacitors (C1, C2, C3 and C4) are input DC decoupling capacitors. The lower interrupt frequency of the amplifier depends on these capacitors. 10uF capacitors (C5 and C6) are the power supply filters. S1 and S2 are the shutdown switches. Connecting the C1 pin to the high logic can create the IC active and connecting the C1 pin to ground will put the Ic into shutdown mode.

If the amplifier class B need two transistors to work properly, then there are the so-called class C amplifier that only need 1 transistor. There are few applications that really only requires a positive phase only. An example is the pilot frequency detector and amplifier, RF tuner amplifier circuit and so forth.


Class C transistor amplifier active work only on the positive phase only, even if the need is quite narrow only the peaks are strengthened. Time signal can replica by series resonance of L and C. Typical of the series class C amplifier is like in the following series.