Datasheet

TCA 3727
Data Sheet 4 Rev. 2.0, 2004-10-01
9 (11)
1)
Supply voltage; block to ground, as close as possible to the IC, with
a stable electrolytic capacitor of at least 10 µF in parallel with a
ceramic capacitor of 220 nF.
12 (14)
1)
Logic supply voltage; either supply with 5 V or connect to +V
S
across a series resistor. A Z-diode of approx. 7 V is integrated. In both
cases block to ground directly on the IC with a stable electrolytic
capacitor of 10 µF in parallel with a ceramic capacitor of 100 nF.
11, 14
(13, 16)
1)
Push-pull outputs Q22, Q21 for phase 2 with integrated free
wheeling diodes.
13 (15)
1)
Resistor R
2
for sensing the current in phase 2.
17 (21)
1)
Inhibit input; the IC can be put on standby by low potential on this
pin. This reduces the current consumption substantially.
18 (22)
1)
Input phase 2; controls the current flow through phase winding 2. On
H-potential the phase current flows from Q21 to Q22, on L potential in
the reverse direction.
1) TCA 3727 G only
Table 2 Digital Control Inputs IX0, IX1
typical
I
max
with R
sense
= 1 Ω, 750 mA
IX1 IX0 Phase Current Example of Motor Status
H H 0 No current
H L 1/3
I
max
Hold
L H 2/3
I
max
Set
LL
I
max
Accelerate
Table 1 Pin Definitions and Functions (cont’d)
Pin No. Function