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TDF5242T Datasheet(PDF) 8 Page - NXP Semiconductors |
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TDF5242T Datasheet(HTML) 8 Page - NXP Semiconductors |
8 / 20 page 1997 Sep 12 8 Philips Semiconductors Preliminary specification Brushless DC motor drive circuit TDF5242T The convention for the inputs (inverting or not) is the same as for a normal operational amplifier: with a resistor (as a load) connected from the output (AMP OUT) to the positive supply, a positive-going voltage is found when the non-inverting input (+AMP IN) is positive with respect to the inverting input ( −AMP IN). Note that a ‘plus’ input causes less current, and consequently a positive voltage. MOTOR CONTROL DC motors can also be operated with analog control 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). FG SIGNAL The FG (Frequency Generator) signal is generated in the TDF5242T by using the zero-crossing of the motor EMF from the three motor windings and the commutation signal. Output FG switches from HIGH-to-LOW on all zero crossings and from LOW-to-HIGH on all commutations. Output FG can source typically 75 µA and sink more than 3 mA. Example: a 3-phase motor with 6 magnetic pole-pairs at 1500 rpm and with a full-wave drive has a commutation frequency of 25 × 6 × 6 = 900 Hz, and generates a tacho signal of 900 Hz. DIRECTION FUNCTION • If the voltage on pin 7 is <2.3 V the motor is running in one direction (depending on the motor connections) • If pin 7 is floating or the voltage is >2.7 V the motor is running in the other direction. BRAKE FUNCTION • If the voltage on pin 9 (pin BRAKE) is <2.3 V the motor brakes; in this condition the external outputs are driven to a HIGH voltage level • If pin 9 is floating or the voltage is >2.7 V the motor runs normally. RELIABILITY 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 in such a way that the transistors are switched off when the junction temperature becomes too high. |
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