The device is built using a multi-technology process which combines bipolar and CMOS control circuitry with DMOS power devices on the same monolithic structure. An innovative circuit which facilitates low-loss sensing of the output current has been implemented. C Thermal shutdown outputs off at ? C Internal clamp diodes Shorted load protection Internal charge pump with external bootstrap capability Applications n n n n n DC and stepper motor drives Position and velocity servomechanisms Factory automation robots Numerically controlled machinery Computer printers and plotters Features n n n n Delivers up to 3A continuous output Operates at supply voltages up to 55V Low RDS ON typically 0.
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There will be a very small shift in the phase of the second and subsequent boosters but this should not cause problems. The input to the second booster should come directly from the output terminals of the existing booster to minimize any signal degradation or noise.
Optional Overload Setting Adjustment This booster circuit is designed to have a fixed, overload current setting of between 3. The variable resistor R10 shown on the schematic would only be used if a lower overload current setting. Under normal operating conditions the position of R10 is short circuited by a path on the circuit board.
If a lower overload setting is desired, the shorting path can be cut, R10 added to the circuit board and adjusted as needed. This value was determined by measurement. Therefore, resistor R11 may need to be tailored to the actual conditions of the circuit.
For this reason be prepared to do some experimenting to get the results you want. This is especially true of circuits such as the "Across Track Infrared Detection" circuits and any other circuit that relies on other than direct electronic inputs, such as switches. If you use any of these circuit ideas, ask your parts supplier for a copy of the manufacturers data sheets for any components that you have not used before. These sheets contain a wealth of data and circuit design information that no electronic or print article could approach and will save time and perhaps damage to the components themselves.
These data sheets can often be found on the web site of the device manufacturers. Although the circuits are functional the pages are not meant to be full descriptions of each circuit but rather as guides for adapting them for use by others.
If you have any questions or comments please send them to the email address on the Circuit Index page.
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