Parker Vansco - Page 42

32 VMM2404
Outputs
 When low-side outputs are used as an on/off signal, the output provides
ground when in the “on” state (the application software is responsible for
switching low-side outputs On and Off).
 When low-side outputs are used to sense current, the application software will
monitor the current flowing into the low-side output, and based on the amount
of current, will turn the output either On or Off.
 The amplifier that measures the sensed current has an allowable voltage
range of 0 V to 3 V. The application software will protect the circuit from
an overcurrent or short-circuit event when the voltage from the amplifier
reaches 2.9 V; therefore, the actual usable voltage range from the
amplifier is only 0 V to 2.8 V.
The following table provides specifications for the VMM2404 low-side outputs:
Low-Side Outputs with Current Sense Specifications
Item
Min
Nom
Max
Unit
Operational voltage range
0
-
32
V
Overvoltage
-
-
36
V
Output current range
0
-
3
A
Load impedance @ 12 V
-
4
-
Ω
PWM
-
No
-
-
Short-circuit protection
-
Yes
-
-
Thermal protection
-
No
-
-
Analog feedback gain
(current sense) - programmable
6.008
(0.6)
Program-
mable
10
(1)
V/V
(V/A)
Analog feedback cutoff frequency @ min gain
-
12
-
Hz
Current sense resistance
0.099
-
.101
Ω
Current sensing resolution -
0 to 3 A range
-
5
14.5
mA
Current sensing resolution -
0 to 2 A range
-
3
8.7
mA
Current sensing accuracy
-
-
3.5
%
Short-circuit trip time
-
-
500
us
Short-circuit current limit
-
14
-
A
Overcurrent trip point -
0 to 3 A range
-
3.1
-
A
Overcurrent trip point -
0 to 2 A range
-
2.1
-
A
Overcurrent trip time
-
1
-
s
Open-load detection
-
No
-
-
Digital feedback
-
No
-
-