Texas Instruments ADS9817EVM-PDK, Руководство пользователя, Страница: 8 / 29

4 Power Supplies
The TSWDC155EVM can provide power using the 3.3-V supply, but is not enabled by default on the
TSWDC155EVM. Typical use requires external power on J17. The TSWDC155EVM provides the ADS9817EVM
with a 3.3-V supply. The ADS9817EVM has a TPS61070 boost converter that boosts the 3.3-V supply to 5.4
V. This voltage is applied to low-dropout regulators (LDOs) to derive the AVDD and the DVDD supply. The
TPS7A2050 provides the 5-V AVDD supply and the TPS7A2018 provides the 1.8-V DVDD supply. The required
power connection is made through jumper J18 and can be set to allow external power to be applied on screw
terminal J17. In this case U2, an LM66100 device, provides reverse polarity protection if the connection is
miswired.
Figure 4-1 shows a schematic for various protection circuits.
1
2
J17
GND
OUT
5
GND
2
IN
1
EN
3
NC
4
TPS7A2050PDBVR
U3
5V
GND
1µF
16V
C1
1µF
16V
C2
GND GND
IN
1
GND
2
CE
3
N/C
4
ST
5
OUT
6
LM66100DCKR
U2
GND
1V8_VDD
GND
1µF
16V
C3
1µF
16V
C4
GND GND
1V8_IOVDD
GND
1µF
16V
C7
1µF
16V
C8
GND GND
2.2k
R1
Green
1
2
D2
APT2012LZGCK
GND
AVDD
VDD
IOVDD
EN
3
IN
1
NC
4
OUT
5
GND
2
TPS7A2018PDBVR
U4
EN
3
IN
1
NC
4
OUT
5
GND
2
TPS7A2018PDBVR
U6
SW
1
GND
2
EN
3
FB
4
VOUT
5
VBAT
6
TPS61070DDCR
U5
10uH
L1
GND
16V
10uF
C5
GND
1.96M
R2
200k
R3
GND
25V
22µF
C6
GND
SPRW_SUP_3P3
LDO_IN
6V
D1
SMBJ6.0CA
GND
1
2
3
J18
Figure 4-1. Power Entry and Regulators
Power Supplies www.ti.com
8 ADS9817EVM-PDK Evaluation Module SBAU416 – NOVEMBER 2022
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