ls7262 LSI Computer Systems, Inc., ls7262 Datasheet - Page 4

• Manufacturer Part Number: ls7262
• Description: Brushless Dc Motor Commutator/controller
• Manufacturer: LSI Computer Systems, Inc.

The OVER-CURRENT input (BRAKE = low) enables external output drivers in normal sequence when more negative than VSS/2 and disables all
external output drivers when more positive than VSS/2. The OVER-CURRENT is sensed continuously, and sets a flip-flop which is reset by the rising
edge of the ENABLE input or the saw-tooth OSCILLATOR. (See description under OVER-CURRENT SENSE.)
The VTRIP input (BRAKE = low) enables the outputs in normal sequence when more negative than the OSC input and disables all outputs when
more positive than the OSC input. The VTRIP input may be disabled by connecting it to VDD and the OSC input to VSS. (See description under
VTRIP)
7262-051711-4
SEPARATION
ELECTRICAL
SEQUENCE
SELECT
INPUTS
SENSE
S1
CS1
0
1
1
1
0
0
0
1
0
(60°)
S2
0
0
1
1
1
0
1
0
CS2
0
0
0
0
1
1
1
0
1
S3
OUTPUT COMMUTATION SEQUENCE FOR THREE PHASE OPERATION
S1 S2 S3
CS1 CS2
0
1
1
1
0
0
0
1
(120°)
0
0
0
0
1
1
1
0
1
FIGURE 1. LS7262 THREE PHASE OUTPUT DRIVER CIRCUITRY
1
1
1
0
0
0
1
0
1
S1 S2 S3
CS1 CS2
0
1
1
1
0
0
0
1
1
(240°)
1
1
0
0
0
1
0
1
0
0
0
0
1
1
1
0
1
CS1 CS2
S1 S2 S3
TABLE 3.
0
1
1
1
0
0
1
0
(300°)
1
1
1
1
0
0
0
1
0
1
1
1
0
0
1
0
1
0
OUTPUTS
ENABLED
O1
O3
O3
O2
O2
O1
ALL DISABLED
ALL DISABLED
O5
O5
O4
O4
O6
O6
FWD/REV = 1
Off
Off
A
+
+
-
-
DRIVERS
Off
Off
B
+
+
-
-
Off
Off
C
+
+
-
-
OUTPUTS
ENABLED
O2
O2
O1
O1
O3
O3
ALL DISABLED
ALL DISABLED
O4
O6
O6
O5
O5
O4
FWD/REV = 0
Off
Off
A
+
+
-
-
DRIVERS
Off
Off
B
+
+
-
-
Off
Off
C
+
+
-
-