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LS7260 Folha de dados(PDF) 5 Page - LSI Computer Systems |
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LS7260 Folha de dados(HTML) 5 Page - LSI Computer Systems |
5 / 7 page TABLE 4. OUTPUT COMMUTATION SEQUENCE FOR FOUR PHASE OPERATION CS1=CS2=0 OUTPUTS ENABLED S1 S2,S3 FWD/REV = 1 FWD/REV = 0 0 0 O1 O4 1 0 O3 O6 1 1 O4 O1 0 1 O6 O3 7260-110697-5 BRAKE MOTOR SUPPLY Vss O6 8 5 COMMON BRAKE INPUT 7 O4 6 9 O5 LS7262 FORWARD REVERSE IN914 2.2K Inputs from SG1731 or UC1637 F/R ENABLE 19 10 IN914 LS7260 or LS7262 FIGURE 3. PRECISION CONTROL BRUSHLESS DC MOTOR DRIVE FIGURE 2A. SINGLE-ENDED DRIVER CIRCUIT This configuration requires only one base current limiting resistor connected from the COMMON pin to Vss. For controlled acceleration and deceleration of motors in the forward or reverse directions, a motor control pulse width modulator circuit such as the SG1731 or UC1637 can be interfaced with the LS7260 or LS7262. The logical OR gate made up of the resistor-diode net- work permits the LS7260 or LS7262 to be enabled when either the forward or reverse input is high. By applying the forward input directly to Pin 19, the motor can only operate in the forward direction when the forward input is high and only in the reverse direction when the reverse input is high. Motor direction is determined by relative pulse widths of the forward and reverse inputs while ac- celeration or deceleration is determined by variations of these widths. For four phase commutation (See Fig. 4), the COMMUTA- TION SELECT inputs must both be tied low. The S1 input is driven from one motor position sensor while the S2 and S3 inputs are connected together and driven by the second position sensor. The COMMON input must be connected to Vss. The sensors have an electrical separa- tion of 90°. Figure 4A indicates the use of Bipolar Tran- sistors. Figure 4B indicates the use of FETs. In both cases, the LS7262 is used. |
Nº de peça semelhante - LS7260 |
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Descrição semelhante - LS7260 |
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