Specifications

AMP2-T assembly instructions. © 41Hz Audio / www.41hz.com Revision 1.0T boards
Figure 1: Top view of the PCB
The numbers refer to the sections shown in
Figure 1: Top view of the PCB.
1. The main component of the input section is one of the two chips in the TK2350 chipset;
the TC2001 signal modulator. This chip sees only low voltages 0 and +5V. It translates
analogue inputs to a digital signal train. Input and feedback resistors set the gain of the
input operational amplifiers in the TC2001 chip. Input capacitors block DC signal to and
from the chip. There are also offset trimmers and timing jumpers here. There are
connectors for low level signals to and from the board. The TC2001 chip modulator
generates binary logic level outputs that control the TP2350 MOSFET driver chip. The
driver frequency is 600 kHz at idle and is a spread spectrum type signal varying from
about 200 kHz to 1.2 MHz.
2. The TP2350B driver translates the logic signals from the modulator chip into level
shifted 10 volt high current pulses required to switch the power MOSFETs gates on and
off. The TP2350B chip also has voltage and current sensing inputs that can shut off the
gate drivers if the correct conditions are not met. The chip controls external power
MOSFETs. These are basically voltage controlled devices. But in reality, the gates of the
MOSFETs have a capacitance and a significant current pulse is required to switch the
MOSFETs on and off at high frequency. The TP2350 chip may get hot and therefore it