Instruments For Testing Your Innovations
High current amplifier is often a very useful piece of instrument to have in the lab. It is very handy for increasing the current driving capability of a function generator or arbitrary waveform generator. Many laboratory applications require high current amp to drive heavy load. Application for high-
Conventional function generator or signal generator has an output impedance of 50-
Figure 1. Simplified diagram is showing how to amplify signal from a function generator to delivery current to a heavy load.
Function generators are commonly found in laboratories. They are being used for all kinds of tests and experiments. Conventional function generator or signal generator has an output impedance of 50-
Figure 2 and 3 shows how a function generator cannot drive heavy loads. The output impedance of the generator is 50-
Figure 2. A function generator outputs 0-
Figure 4 shows how the TS200/TS250 high current amplifier can drive the above mentioned heavy loads with negligible attenuation, because its source impedance is near zero. The TS200/TS250 current amplifiers has very low output impedance in the order of tens of mili-
Figure 3. A function generator outputs a 0-
When the load is capacitive (Figure 3 top), the signal generator's source impedance and load capacitance formed a low-
Figure 4. TS200/TS250 high output current amplifier drives heavy load without voltage attenuation.
Figure 5. TS200 high-
Figure 6. Left: The TS200 is driving a 4.7mH inductor. The output waveform maintains 5V square without any distortion or attenuation. Right: The TS200 amplifier is driving a 1-
The TS250/TS200 output current is in the range of 1.4A to 6A, depends on the voltage range. See the datasheet specs for output current range. In some test applications higher current is required. Two or three TS250 current amplifiers may be operate in parallel as shown in Figure 7. The output current is double or triple in proportion to the how many TS250 connected in parallel. Using a series resistor for each current amp to isolate from one other. Typical series resistor resistance is 0.3Ω to 1.0Ω. Use higher resistance for for higher voltage models (i.e. 1 ohm for the +/-
Figure 7. Two TS250 current amplifiers connected in parallel increase the current by 2X.
Related App Notes
The TS200 and TS250 fulfill many testing applications require high AC current to drive their low-