25A Series
A-7
PIN FUNCTIONS:
CONNECTOR
PIN
NAME
DESCRIPTION / NOTES
I/O
1
+5V OUT
O
2
SIGNAL GND
GND
3
-5V OUT
Internal DC-to-DC converter, outputs regulated voltages of
±
5 V @ 3 mA for customer use. Short circuit protected.
O
4
+REF IN
5
-REF IN
Differential analog input, maximum ±15 V, 50K input
resistance.
I
6
-TACH IN
7
+TACH (GND)
Maximum ± 60 VDC, 60K input resistance.
I
8
CURRENT
MONITOR OUT
This signal is proportional to the actual current in the
motor leads. Scaling is 2A/V for 12A8 and 4 A/V for
25A8, 20A14 and 20A20.
O
9
CURRENT
REFERENCE OUT
Command signal to the internal current-loop. The
maximum peak current rating of the amplifier always
equals 7.25V at this pin. See current limit adjustment
information below.
O
10
CONTINUOUS
CURRENT LIMIT
Can be used to reduce the factory-preset maximum
continuous current limit.
I
11
INHIBIT
This TTL level input signal turns off all four power devices
of the "H" bridge drive when pulled to ground. This inhibit
will cause a FAULT condition and a red LED. For inverted
inhibit inputs; see section "G".
I
12
+INHIBIT
Disables the amplifier for the "+" direction only. This
inhibit will not cause a FAULT condition or a red LED.
I
13
-INHIBIT
Disables the amplifier for the "-" direction only. This
inhibit will not cause a FAULT condition or a red LED.
I
14
FAULT OUT
(red LED)
TTL compatible output. It becomes high during output
short-circuit, over-voltage, over-heating, inhibit, and during
"power-on reset". Fault condition indicated by a red LED.
O
15
P1
16
NC
Not connected
1
-MOTOR
Motor minus connection.
O
2
+MOTOR
Motor plus connection.
O
3
POWER GROUND Power Ground.
GND
4
POWER GROUND Power Ground.
GND
P2
5
HIGH VOLTAGE
DC voltage input.
I
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