AMC1203 datasheet(17/23 Pages) TI

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APPLICATION INFORMATION

12W

SHUNT

AMC1203

Gated

Drive

Circuit

ToLoad

Floating

PowerSupply

HV+

Isolation

Barrier

330pF

10pF

(optional)

DD1

IN+

IN-

GND1

DD2

MDAT

MCLK

GND2

10pF

(optional)

(1)

0.1 F

5.1V

Gated

Drive

Circuit

Power

Supply

HV-

NOTE:(1)PlaceC closetoAMC1203.

AMC1203

SBAS427 – FEBRUARY 2008

A typical operation of the AMC1203 in a motor-control

0.1

µF is recommended for filtering this

application is shown in Figure 30. Measurement of

power-supply path. This capacitor (C1 in Figure 30)

the motor phase current is done via the shunt resistor

should be placed as close as possible to the VDD1 pin

(RSHUNT; in this case, a 2-terminal shunt). For better

for best performance. If better filtering is required, an

performance, the differential signal is filtered using

additional 1

µF to 10µF capacitor can be used. The

RC filters (components R2, R3 and C2). Optionally, C3

floating ground reference (GND1) is derived from the

and C4 can be used to reduce charge dumping from

end of the shunt resistor, which is connected to the

the inputs. In this case, care should be taken when

negative input of the AMC1203 (VIN–). If a 4-terminal

choosing the quality of these capacitors—mismatch in

shunt is used, the inputs of the AMC1203 are

values

these

capacitors

will

lead

connected to the

inner

leads,

while

GND1

common-mode error at the input of the modulator.

connected to one of the outer leads of the shunt.

Both digital outputs, MCLK and MDAT, can be

The high-side power supply for the AMC1203 (VDD1)

directly connected to a digital filter (that is, the

is derived from the power supply of the upper gate

AMC1210); see Figure 23.

driver. For lowest cost, a Zener diode can be used to

limit the voltage to 5V ±10%. A decoupling capacitor

Figure 30. Typical Application Diagram

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