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DiY Class-D UcD1K Power Amplifier

Hello guys, in this post I will assemble DIY a Class-D UcD1k power amplifier designed by Mr. Kartino Surodipo, which uses the LM311 IC as a comparator and IR2110 for the mosfet driver. This Class-D UcD requires only a few components and is easy to find components. Later, I will share the layout for free, which has been fixed, with an updated schema at the end of the post. 

Here is the PCB layout, I designed this layout in two layers, with dimensions of 6.5cm x 20cm.

PCB Layout Class-D UcD1K

Prepare the components according to the BoM file/component list, use quality components so that the results can be maximized, or most importantly, don't bargain for the value. How to open the BoM file, upload it on the LCSC.com site, the component list will open, and it's neatly organized, if you use Ms Excel, the component list is usually messy. The BoM file is also at the end of the post.

IC LM311 and IR2110 can be SMD for alternative options, you can also use DIP ICs. so you can use only one, which can be SMD or DIP.
use a good IC because the LM311 IC also affects the PWM frequency, as well as the performance of the amplifier itself.
LM311 IR2110 Amplifier Class-D
For the 6k8 3W Shunt Resistor I use 2x12K resistors in parallel, the installation is stacked like this. The R shunt is for 90VDC CT supply voltage, if the voltage is smaller, the resistance value can be lowered. eg 60VDC CT can use 4K7 3W.
Class-D UcD LM311 IR2110

Totem transistors other than BD139/BD140 can use 2SC2655 and 2SA1020. Actually, this can be direct without a totem. If you want without a totem, you can jump the base and emitter directly, no need to install transistors Q6, 7, 11, and 12.
Class-D UcD LM311 IR2110

On IC LM311, because I use IC SMD, at the top of the pcb can be fitted with Elco, to pin 4 for min and 8 for + , the minimum elco voltage is 16V. 


For the inductor, I used 2 double Micrometal T130-2 cores, wrapped 30 times, I got an inductance of about 30uH. The inductor can also use the MS130 3cm blue, the number of turns if the double core is 17-20x turns.
Inductor class-d amplifier

Mosfet can use irfp250, irfp260, irfp4227, or irfb4227 for the TO220 package that I have provided holes for it.

Mosfet Class-D UcD1K

This dead time resistor is set at R17 and R18 because the original schematic is 4K2 and the one I'm using is 4K7. so I just parallel with the 47K resistor, so that the value is close to 4K2. R17 and R18, the larger the value, the narrower the dead time will be, and vice versa. What is the impact if it gets narrower? As a result, the mosfet can heat up quickly even when it's on standby, there can even be a cross which can cause the mosfet to short. if it's too loose, the effect will be that the power will be sluggish or underpowered, it can be sinus defects, or even the amplifier can fail to start.

Resistor dead time Class-D Amplifeir
The power released by this amplifier is around 700W RMS continuously using a 4-ohm dummy load, with a 90VDC supply, the same power as other Halfbridge class-D amplifiers, the sine signal is also smooth to near the clipping.
Load Class-D Amplifeir

Assembling and tested video:



Download:

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