AMC1301-Q1 Datasheet, PDF (24/34 Pages) Texas Instruments – Precision, 250-mV Input, Delay, Reinforced Isolated Amplifier

AMC1301-Q1
SBAS792A – APRIL 2017 – REVISED APRIL 2017
www.ti.com
10 Power Supply Recommendations
In a typical traction inverter application, the high-side power supply (VDD1) for the device is derived from the
floating power supply of the upper gate driver. For lowest cost, a Zener diode may be used to limit the voltage to
5 V (or 3.3 V, depending on the design) ± 10%. Alternatively a low-cost, low-dropout (LDO) regulator (for
example, the LP2951-XX-Q1) may be used to minimize noise on the power supply. TI recommends a low-ESR
decoupling capacitor of 0.1 µF to filter this power-supply path. Place this capacitor (C₂ in Figure 54) as close as
possible to the VDD1 pin of the AMC1301-Q1 device for best performance. If better filtering is required, an
additional 10-µF capacitor may be used. The floating ground reference (GND1) is derived from the end of the
shunt resistor, which is connected to the negative input (VINN) of the device. If a four-pin shunt is used, the
device inputs are connected to the inner leads, and GND1 is connected to one of the outer leads of the shunt.
To decouple the digital power supply on the controller side, use a 0.1-µF capacitor placed as close to the VDD2
pin of the AMC1301-Q1 device as possible, followed by an additional capacitor from 1 µF to 10 µF.
HV+
Floating
Power Supply
20 V
To Load
RSHUNT
Gate Driver
Z1
1N751A
R1
800
C1
10 F
AMC1301-Q1
5.1 V
VDD1
VDD2
C2
0.1 F
C4
0.1 F
GND1
GND2
C5
2.2 F
3.3 V or
5.0 V
Gate Driver
VINN
VINP
VOUTP
VOUTN
ADC121S101-Q1
12-Bit ADC
HV-
Copyright © 2016, Texas Instruments Incorporated
Figure 54. Zener-Diode-Based, High-Side Power Supply
24
Submit Documentation Feedback
Product Folder Links: AMC1301-Q1
Copyright © 2017, Texas Instruments Incorporated