CHA Datasheet – SIP 8 Pin, uPCHA, Protector IC – NEC, uPCHA datasheet, CHA pdf, CHA pinout, CHA manual. CHA Datasheet PDF Download – UPC, CHA data sheet. Work as either latching function or automatic resetting function by using pin 3. (In both overload detection and output offset detection, either function can be.

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Almost any Sony amplifier starting from the lower range and right up to the higher-end ES series are using this chip. So I thought was a good idea to make a stand alone module which could be used by the DIY community. One important aspect is that this IC could be used to prevent the output devices from over current.

Most power amplifiers have a dedicated circuit built in them, to monitor the current flow trough the power transistors. This part of the schematic is forcing the current to stay within the recommended SOA of the devices. Using uPC for over current datadheet allows the designer to drop the SOA limiting elements in the power amplifier.

CHA(IC) NTE Equivalent NTE IC – PROTECTOR IC FO – Wholesale Electronics

This will save space on the PCB, lower the cost of the project and increase the reliability. There is no built-in circuit either. However all you need is to monitor the current flow trough one of the emitter resistors at the output c127ha the power amplifier. According to the datasheet pin 1 must be driven above 0.

This is the threshold. Rising the voltage above 0. Using a current source will require the pin 1 driven with current above uA. Now the schematic of the module itself. It can be downloaded HERE. A few words about the PCB. Now I wanted to have a rather non standard approach here. I needed a module which could be mounted directly on the rear panel and bolted through the speaker terminals.


However those were using small current relays not suitable for more powerful amplifiers. Those can be quite bulky so the PCB is quite large. However, reliability is more important than the cost of the PCB. The devices protected by this module can be quite expensive so no cheap tricks here. The relay is located between the mounting pads to keep the paths equal and at the same length.

The mounting pads are of 15mm diameter. The mounting holes are at 5. Those can be drilled to a larger diameter if necessary. My speaker terminals have 5mm threads and fit just fine.

Any commercial usage is prohibited. Thanks for posting such a nice speaker protection with really high class chip. But can you write all resistor values?

Because not all of them are written in he schematic? Hi, some of the resistor values depend on the supply voltage.

Datasheet, PDF, Circuit Diagram, Application Notes

Hi Andrew, the IC can not work at this power supply. The maximum allowed is 60VDC.

There is a solution around this however, if you can provide a low power auxiliary voltage of about 18VAC. Hello Ventsislav greetings very kind of you for replying i can provide the low power auxiliary xatasheet volt ac for a long time i have been searching for a short circuit protection schematic little help from you and i can make it from schematic i can design the pcb please schematic if you can share datasyeet regards andrew.


Hello Ventsislav greetings please can you share schematic even if low voltage one warm regards andrew.

Hello Simonov, Dstasheet am wonderig how did you compute resistors for first schematic over current protection? It seems something with overdrive protection does not work. I am wondering if this works for you Ventsislav? Hi, the circuit does work. It was in fact used in many industry amplifiers. Many brands use uPC Hi Ventsislav, I am very interested in this particular design — it is one of the few that has c1237a mounting and using quality parts for higher powered amplifiers.

Do you know if this PCB is available for sale anywhere — or has been produced anywhere previously that I would be able to obtain further boards from?

Great article about a very usefull item which no one ever hopes to use.

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Skip to content Skip to primary sidebar Skip to footer. Thanks for your help. Hi Ventsislav, Great article about a very usefull item which no one ever hopes to use. Leave a Reply Cancel reply Your email address will not be published. Follow Us on Twitter And Facebook.