ETAS
Half-bridges ("PS" Connection)
ES930.1
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User Guide
60
– Current sense PS n
• Half-bridge (power stage) n+1
– Half-bridge switch n+1
– Current sense PS n+1
• Error state PS n / PS n+1 (used jointly by the channel group)
The functionality of all power stages can be configured separately.
10.2.2
Error State PS n/n+1 Assembly used jointly by a Half-bridge
Channel Group
The Error State PS n/n+1 diagnostics assembly is used jointly for both Half-
bridges of a channel group (power stage group). It determines error states
(short-circuit, overcurrent, overtemperature) within the half-bridge channel
group and signals them to the diagnostics unit. In case of an error state, both
channels of the half-bridge channel group are always switched off together to
protect it.
10.3
Assemblies of a Half-bridge
10.3.1
Overview
The six Half-bridges "PS 1" to "PS 6" allow expanding the six digital output chan
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nels "DO 1" to "DO 6" to power stages.
Each Half-bridge is controlled by a digital output channel and is permanently
assigned to this channel (see chapter 9.1.7 on
54).
Since the control signal of a Half-bridge corresponds to the signal at the
assigned digital output, the Half-bridge control signal can be checked with the
oscilloscope at the assigned digital output during the initial startup of an exper
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imental arrangement.
The control of the Half-bridges cannot be done independently, but solely via the
digital output channels.
10.3.2
Half-bridge Switch
The two power MOSFETs (high-side switch and low-side switch) of a Half-
bridge are controlled jointly by a digital output channel and alternately switch
on and off. The power MOSFETs are alternately occupying one of the following
switching states:
• High-side switch "On" and low-side switch "Off"
• High-side switch "Off" and low-side switch "On"
The half-bridge switches cannot be used individually, only together as Half-
bridge.
NOTE
The Half-bridges cannot be used as additional independent output channels,
only together with digital output channels.
