to MCU

ADS8363

16-Bit ADC

1 µF

100 nF

1 nF

1 nF

100 nF

10

10

8.2 nF

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

NC

AMC3301

1 µF

1 nF

100 nF

47 k

DCDC_IN

LDO_OUT

VDD

OUTP

OUTN

GND

DIAG

DCDC_GND

3.3 V / 5 V supply

to MCU

to uC (optional)

GND

1 µF

100 nF

1 nF

1 nF

100 nF

10 nF

DCDC_OUT

DCDC_HGND

HLDO_IN

HLDO_OUT

HGND

INP

INN

NC

AMC3330

1 µF

1 nF

100 nF

47 k

DCDC_IN

LDO_OUT

VDD

OUTP

OUTN

GND

DIAG

DCDC_GND

3.3 V / 5 V supply

to uC (optional)

GND

ADS8363

16-Bit ADC

to grid (L1)

RSHUNT

DC+

DC-

IPHASE

HS Gate

Driver

Supply

LS Gate

Driver

Supply

PGND

PGND

SW

RL11

RL1SNS

SW

PGND

N

N

RL12

Figure 7-1. The AMC3330 in a Solar Inverter Application

7.2.1 Design Requirements

Table 7-1 lists the parameters for this typical application.

Table 7-1. Design Requirements

PARAMETER

VALUE

Low-side supply voltage

3.3 V or 5 V

Voltage drop across the sensing resistor for a linear response

1 V (maximum)

Current through the resistive divider, ICROSS

100 µA (maximum)

7.2.2 Detailed Design Procedure

Use Ohm's Law to calculate the minimum total resistance of the resistive divider to limit the cross current to the

desired value ( RTOTAL = VLx / ICROSS ) and the required sense resistor value to be connected to the AMC3330

input: RSNS = VFSR / ICROSS.

Consider the following two restrictions to choose the proper value of the sense resistor RSNS:

• The voltage drop on RSNS caused by the nominal voltage range of the system must not exceed the

recommended input voltage range: VSNS ≤ VFSR

• The voltage drop on RSNS caused by the maximum allowed system overvoltage must not exceed the input

voltage that causes a clipping output: VSNS ≤ VClipping

AMC3330

SBASA34B – JUNE 2020 – REVISED AUGUST 2024

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