ls7260 LSI Computer Systems, Inc., ls7260 Datasheet
ls7260
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ls7260 Summary of contents
Page 1
... For the LS7262, a high level at this input unconditionally turns Off Outputs 1, 2 and 3 and turns On Outputs 4, 5 and 6 (See Fig. 2). For the LS7260, a high level at this input turns On Out- puts 1, 2 and 3 and Outputs 4, 5 and 6 (See Fig. 1). In both cases, transistors Q101, Q102 and Q103 cut off and transistors Q104, Q105 and Q106 turn on, shorting the windings together, The BRAKE has priority over all other inputs ...
Page 2
... NPN transistors or gate drive to N-Channel FET drivers. COMMON (Pin 5) The COMMON may be connected to Vss when using a center-tapped motor configuration or when using all NPN or N-Channel drivers. For the LS7260, the COMMON is tied to V Vss, V Supply voltage positive and negative terminals. SYMBOL ...
Page 3
... R 22 osc For the LS7260, (See Fig. 1) the external drivers also turn on in pairs. Internal operation is somewhat different than the LS7262. For example, external transistors Q101 and Q105 will turn on when internal transistor Q8 turns off and Q4 turns on enabling full power supply drive on Q101 and Q105 ...
Page 4
... Output Encoder 12 FIGURE 1. LS7260 THREE PHASE OUTPUT DRIVER CIRCUITRY BRAKE Output Encoder Vss 12 FIGURE 2. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY 7260-012703 Vss 6 TO OVERCURRENT ADJUSTMENT ...
Page 5
... 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 TABLE 4. OUTPUT COMMUTATION SEQUENCE FOR FOUR PHASE OPERATION ...
Page 6
FIGURE 4. FOUR PHASE OUTPUT DRIVER CIRCUITRY FIGURE 4A 5 Vss COMMON 9 BRAKE INPUT LS7262 OVERCURRENT Vss FROM MOTOR ...
Page 7
... COMMUTATION 4 SEQUENCE SELECT LOGIC +V INPUT DECODER EDGE R Q DETECTOR + S - POSITIVE EDGE DETECTOR - + SAWTOOTH OSCILLATOR FIGURE 6. LS7260 AND LS7262 BLOCK DIAGRAM COMMON OUTPUT DRIVERS OUTPUT ENCODER + GND ...