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SLYU051A – August 2019 – Revised March 2020

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Copyright © 2019–2020, Texas Instruments Incorporated

TMCS1101EVM

3.2

Circuitry

This section summarizes the TMCS1101EVM components.

For the following circuits:

x = B for bidirectional, or U for unidirectional

y = A to D for the A1 to A4 gain variants, respectively.

3.2.1

Bypass Capacitors

C1xy and C2xy are 10-

μ

F and 0.1-

μ

F supply bypass capacitors, respectively, for the TMCS1101. C4xy is

the 0.1-

μ

F bypass capacitor for the optional temperature sensor.

3.2.2

Output Filter

C3xy and R1xy are footprints for the optional output filter. Default values are 10 pF and 0

, but no

capacitors are installed. TP2xy is the test point for the TMCS1101 output.

3.2.3

Measurement Connector

J2x is an additional connector for measuring VCC and VOUT. J2x also provides a connection for
measuring board temperature (TMP).

3.2.4

Load Connectors

T1xy and T2xy correspond to the high-current rated load connectors. By default, the EVM is only
populated with two of these connectors on the bidirectional, lowest gain variant (x = B and y = A). TP3x
and TP6x are Kelvin connections to probe the EVM inputs. The IS+ (T1xy) and IS– (T2xy) inputs accept a
load that is converted to a magnetic field sensed by a Hall element that produces a voltage. This voltage
is amplified by the selected device gain and is presented at the VOUT test point (TP2xy). The acceptable
load input maximum is 20 A for dc measurements. However, the load can be significantly higher for ac
signals, and the load is bound by the safe operating area (SOA) described in the TMCS1101 data sheet.

3.2.5

Ground Test Points

TP3x, TP4x, and TP5x correspond to ground connections of the TMCS1100 device.

3.2.6

TMCS1101 Isolated Current-Sense Amplifier

U1xy is the TMCS1101 isolated current-sense amplifier. Eight segments are supplied within the
TMCS1101EVM board. Each segment is populated with one of the available device gains for bidirectional
or unidirectional sensing. This configuration enables users to test the devices and determine the best gain
setting for a given application. For y = A to D, the gain is 50 mV/A, 100 mV/A, 200 mV/A, and 400 mV/A,
respectively.

The TMCS1101AnB is used for bidirectional applications, while TMCS1101AnU is used for
unidirectional applications (where n = 1 to 4 for the A1 to A4 gain variants, respectively).

A magnetic field is generated based on the load current that is connected across the inputs IS+ and
IS–, and flows through the TMCS1101 leadframe.

The output voltage swing limitation and required load current sensing range are the key factors when
determining device selection.

The selected device must allow the output voltage to remain within the acceptable range after the load
current is transduced and amplified by the respective device gain. The max output voltage must remain
within the range of 25 mV above ground to 100 mV below the supply voltage.

Choose an appropriate gain to create the largest appropriate output swing, and to minimize error.

3.3

Temperature Sensor

U2x is a temperature sensor that is not required for TMCS1100 operation. However, U2x provides the
option of measuring board temperature for determining ambient conditions.

Summary of Contents for TMCS1101EVM

Page 1: ...cs operation and use of the TMCS1101 evaluation module EVM This EVM is designed to evaluate the performance of the TMCS1101 voltage output isolated Hall effect current sense amplifiers in a variety of...

Page 2: ...2 Circuitry 6 3 3 Temperature Sensor 6 4 Operation 7 4 1 Measurements 8 4 2 Advanced Measurement Tips 8 5 Schematics PCB Layout and Bill of Materials 9 5 1 Schematics 9 5 2 PCB Layout 10 5 3 Bill of...

Page 3: ...Area Safety a Keep work area clean and orderly b Qualified observer s must be present anytime circuits are energized c Effective barriers and signage must be present in the area where the TI HV EVM an...

Page 4: ...1B Bidirectional 50 mV A TMCS1101A2B Bidirectional 100 mV A TMCS1101A3B Bidirectional 200 mV A TMCS1101A4B Bidirectional 400 mV A TMCS1101A1U Unidirectional 50 mV A TMCS1101A2U Unidirectional 100 mV A...

Page 5: ...The TMCS1101EVM consists of one PCB that can be snapped apart into eight individual segments one for each of the four gain variants in both the bidirectional B and unidirectional U configurations TMCS...

Page 6: ...er for ac signals and the load is bound by the safe operating area SOA described in the TMCS1101 data sheet 3 2 5 Ground Test Points TP3x TP4x and TP5x correspond to ground connections of the TMCS1100...

Page 7: ...xternal supplies are distinguished by hot for load and cold for DUT supply The hot supply can be isolated and at a different potential than the cold supply Figure 1 Low Side Forward Current Setup Step...

Page 8: ...DUT 4 2 Advanced Measurement Tips To assess whether the expected load matches the measured load use a precision shunt resistor rated for the maximum intended current in series with the DUT The precisi...

Page 9: ...f the A1B sub board on the TMCS1101EVM PCB Only the schematic for the bidirectional A1 50 mV A gain variant is included as all variants use the same circuit and same PCB layout All components associat...

Page 10: ...SLYU051A August 2019 Revised March 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated TMCS1101EVM 5 2 PCB Layout Figure 3 through Figure 6 illustrate the PCB layers...

Page 11: ...ics PCB Layout and Bill of Materials 11 SLYU051A August 2019 Revised March 2020 Submit Documentation Feedback Copyright 2019 2020 Texas Instruments Incorporated TMCS1101EVM Figure 5 Bottom Overlay Fig...

Page 12: ...H1BB H1BC H1BD H1UA H1UB H1UC H1UD H2BA H2BB H2BC H2BD H2UA H2UB H2UC H2UD H3BA H3BB H3BC H3BD H3UA H3UB H3UC H3UD H4BA H4BB H4BC H4BD H4UA H4UB H4UC H4UD 32 BUMPER CYLIN 0 312 DIA BLK SJ61A6 3M J1BA...

Page 13: ...rrent Sense Monitor With External Reference D0008A SOIC 8 D0008A TMCS1101A1BDR Texas Instruments U1BB 1 Precision Isolated Current Sense Monitor With External Reference D0008A SOIC 8 D0008A TMCS1101A2...

Page 14: ...Number Manufacturer U1UD 1 Precision Isolated Current Sense Monitor With External Reference D0008A SOIC 8 D0008A TMCS1101A4UDR Texas Instruments U2BA U2BB U2BC U2BD U2UA U2UB U2UC U2UD 8 Temperature S...

Page 15: ...bers for previous revisions may differ from page numbers in the current version Changes from Original August 2019 to A Revision Page Changed the Hardware section 5 Added the on board temperature senso...

Page 16: ...change without notice TI grants you permission to use these resources only for development of an application that uses the TI products described in the resource Other reproduction and display of thes...

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