Vansco VMM3120, User Manual

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28 VMM3120
Outputs
The VMM3120 has 20 solid-state FET technology outputs designed for low to
medium current and high inrush inductive load switching. Output currents can
range up to 2.5 A.
The VMM3120 has 2 types of outputs:

High-side outputs

Low-side outputs with current sense
Note: A high-side and a low-side output can be used to create a half-bridge.
An H-bridge output can be created from 2 half-bridges, allowing 2 full H-
bridge outputs to be produced (refer to
Controlling a Linear Actuator for an
example of how to use an H-bridge).
4.1. High-side outputs
The VMM3120 has 16 high-side outputs:

OUTPUT1_2A5_HS to OUTPUT16_2A5_HS
4.1.1. High-Side Output Capabilities
High-side outputs are used for switching voltage to loads using either a pulse
width modulated (PWM) signal, or an on/off signal. They can also test for various
fault conditions, which can be used for software diagnostics (refer to
High-Side
Output Diagnostics and Fault Detection on page 32 for more details).
All high-side outputs come with internal flyback diodes that provide protection
when driving inductive loads.

When a high-side output is used as a PWM signal, a pulsed output signal is
provided by the VMM3120, where the percentage of time that the output is on
vs. off is determined by the duty cycle of the signal, and the duty cycle is
determined by the application software.
4. Outputs