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TDA5144AT Datasheet(PDF) 15 Page - NXP Semiconductors |
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TDA5144AT Datasheet(HTML) 15 Page - NXP Semiconductors |
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15 / 20 page  June 1994 15 Philips Semiconductors Product specification Brushless DC motor drive circuit TDA5144 MOTOR CONTROL DC motors can be controlled in an analog manner using the OTA. For the analog control an external transistor is required. The OTA can supply the base current for this transistor and act as a control amplifier (see Fig.8). RELIABILITY It is necessary to protect high current circuits and the output stages are protected in two ways: • Current limiting of the ‘lower’ output transistors. The ‘upper’ output transistors use the same base current as the conducting ‘lower’ transistor (+15%). This means that the current to and from the output stages is limited. • Thermal protection of the six output transistors is achieved by each transistor having a thermal sensor that is active when the transistor is switched on. The transistors are switched off when the local temperature becomes too high. It is possible, that when braking, the motor voltage (via the flyback diodes and the impedance on VMOT) may cause higher currents than allowed ( >0.6 A). These currents must be limited externally. |
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