Copyright © 2017, Texas Instruments Incorporated
Copyright © 2017, Texas Instruments Incorporated
Power Supplies
4
SLAU745 – November 2017
Copyright © 2017, Texas Instruments Incorporated
AMC1311EVM Users Guide
3
Power Supplies
The AMC1311EVM requires two separate power rails, VDD1 and VDD2. VDD1 is on the high voltage side
of the amplifier. VDD2 is on the user side of the amplifier.
3.1
VDD1 Input
The default configuration of the EVM provides 5V to VDD1 through transformer T1 via U3, an SN6501
push-pull driver. A shunt on jumper J5 is shorting pins 1-2 which routes the regulated 5V from U2, a
TPS76350, to pin 1 of U1. The screw terminal at J4 allows the user to provide their own VDD1 source
when the shunt on J5 is covering pins 2-3. The VDD1 supply should be between 3 and 5.5 VDC when
using an external voltage source. The input power scheme is shown in
.
Figure 3. VDD1 Input
3.2
VDD2 Input
The user side of the AMC1311 isolation amplifier is rated for 3.0 to 5.5 VDC and is applied to the amplifier
using J3 pin 1. When using the on-board transformer for VDD1, a minimum of 3.6 V is needed at J3.
depicts the power input for VDD2.
Figure 4. VDD2 Input Connector
