Datasheet

Data Sheet 3 Rev. 2.0, 2004-10-01
TCA 3727
Figure 2 Pin Configuration TCA 3727 G (top view)
Table 1 Pin Definitions and Functions
Pin No. Function
1, 2, 19, 20
(1, 2, 23, 24)
1)
Digital control inputs IX0, IX1 for the magnitude of the current of the
particular phase. See Table 2.
3 Input Phase 1; controls the current through phase winding 1. On
H-potential the phase current flows from Q11 to Q12, on L-potential in
the reverse direction.
5, 6, 15, 16
(5, 6, 7, 8, 17,
18, 19, 20)
1)
Ground; all pins are connected internally.
4 Oscillator; works at approx. 25 kHz if this pin is wired to ground
across 2.2 nF.
8 (10)
1)
Resistor R
1
for sensing the current in phase 1.
7, 10
(9, 12)
1)
Push-pull outputs Q11, Q12 for phase 1 with integrated free-
wheeling diodes.
Q12
Q22
Q21
GND
GND
OSC
Phase 1
Phase 2
11
Ι
R
1
IEP00898
10
Ι
GND
Q11
V
S
++
L
V
2
R
Inhibit
Ι
20
Ι
21
GND
241
232
223
214
205
196
187
178
169
1510
1411
1312
GND
GND
GND
GND