Hardware Description
2020 Microchip Technology Inc. DS50002927A-page 35
TABLE 3-2: SELECTION BETWEEN EXTERNAL AND INTERNAL AMPLIFIER OUTPUTS
The gain of the amplifier used for phase current and bus current sensing is set for
sensing 22A peak current by default. The gain of the amplifier can be changed, as
required by the application, by modifying the amplifier input and feedback resistors.
For more information, refer to C.2 “Current Amplifier Circuits”.
Current
Signal
Jumper Resistor Settings
RemarksInternal Amplifier Output External Amplifier Output
Populate Remove Populate Remove
Amplified Phase A
Currents
IA or IA_EXT
R125 R121 R121 R125 In internal amplifier configuration,
configure and enable Op Amp 1 (OA1).
In external amplifier configuration,
ensure internal amplifier Op Amp 1
(OA1) is disabled.
Amplified Phase B
Currents
IB or IB_EXT
R133 R129 R129 R133 In internal amplifier configuration,
configure and enable Op Amp 2 (OA2).
In external amplifier configuration,
ensure internal amplifier Op Amp 2
(OA2) is disabled.
Amplified Phase C
Currents
IC_EXT
Not Applicable Phase C current is amplified only by
external amplifier U5-C and its output
(IC_EXT) is connected directly to an
analog input of the dsPIC
®
DSC.
Amplified Bus
Currents
IBUS or
IBUS_EXT
R141 R137 R137 R141 In internal amplifier configuration,
configure and enable Op Amp 3 (OA3).
In external amplifier configuration,
ensure internal amplifier Op Amp 3
(OA3) is disabled.
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