Sharp FO-5700, Руководство по обслуживанию, Страница: 60 / 140

FO-5700U
5 – 16
ENABLE PHASE OUTA OUTB
L H H L
L L L H
H – OFF OFF
I
0
I
1
Output Current
L L Vref/ (10 x R
E
) = I
OUT
H L Vref/ (15 x R
E
) = I
OUT
x 2/3
L H Vref/ (30 x R
E
) = I
OUT
x 1/3
H H 0
(11) Driver block
Sending motor driver (IC7: LB1845) ---- 28-pin DIP
This IC driver at the sending motor at the constant current with the bipo-
lar, chopper system.
Fig. 4
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
PHASE2
VREF2
ENABLE2
I02
I12
CURRENT CONTROL
BLOCK
SENSE2
E2
ONE
SHOT
RC2
OUTPUT
BLOCK
PHASE1
VREF1
ENABLE1
I01
I11
CURRENT CONTROL
BLOCK
E1 SENSE1
ONE
SHOT
RC1
TSD
D-GND
GND
OUT2A OUT2B OUT1A OUT1B
VCC 28
6 7 1 8 9
25
26
24
22
23
3 2 27 11 15 16 12 13
20
21
19
17
18
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
OUTPUT
BLOCK
4
VBB
14
[Truth Table]
Note: When ENABLE = H or I
0
= I
1
= H, the output is in OFF state.