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TDA5146T 데이터시트(PDF) 10 Page - NXP Semiconductors |
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TDA5146T 데이터시트(HTML) 10 Page - NXP Semiconductors |
10 / 18 page Philips Semiconductors Product specification TDA5146T Brushless DC motor drive circuit 1994 May 18 10 1. Value selected for 3 HZ start–up oscillator frequency Figure 6. Application diagram without use of the FET driver stage APPLICATION INFORMATION Introduction Full–wave driving of a three phase motor requires three push–pull output stages. In each of the six possible states two outputs are active, one sourcing and one sinking current. The third output presents a high impedance to the motor which enables measurement of the motor EMF in the corresponding motor coil by the EMF comparator at each output. The commutation logic is responsible for control of the output transistors and selection of the correct EMF comparator. The zero–crossing in the motor EMF (detected by the comparator selected by the commutation logic) is used to calculate the correct moment for the neat commutation, that is, the change to the next output state. The delay is calculated (depending on the motor loading) by the adaptive commutation delay block. Because of high inductive loading the output stages contain flyback diodes. The output stages are also protected by a current limiting circuit and by thermal protection of the six output transistors. The zero–crossings can be used to provide speed information such as the tacho signal FG. |
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