Renesas ISL28005 User manual

Evaluation Board Manual

AN1531 Rev.1.00 Page 1

The ISL28005 evaluation board is a design platform

containing all the circuitry needed to characterize

critical performance parameters of the ISL28005 in

either a high side or low-side current sense

application. The ISL28005 is available in fixed

100V/V, 50V/V, and 20V/V gains.

Features

▪One installed sense resistor: 100mΩ, 1W, 1%

▪Connectors for direct connections to external

system supply and load resistor

▪Options for four more on-board sense resistors

▪Options for additional input and output filter

resistors and capacitors

Specifications

▪Low Power Consumption: 50μA,Typ

▪Supply Range on VS+: 2.7V to 28V

▪Wide Common Mode Input: 0V to 28V

▪Operating Temperature Range: -40°C to +125°C

Figure 1. Block Diagram

Optiona l

Input Filter

Optiona l

Output Filter

VS+

GND

I-SENSE+

I-SENSE-

GND

I-SENSE

OUT

ISL28005

RS+

RS- GND

OUT

VCC

ISL28005xEVAL1Z

AN1531 Rev.1.00 Page 2

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

Contents

1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Optional Transient Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2.1 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

AN1531 Rev.1.00 Page 3

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

1. Functional Description

1.1 Optional Transient Protection

For applications where the load and the power source are permanently connected, transient protection is not

required and only an external current sense resistor (R3) is needed.

For applications where fast transients can generate voltage spikes that can overdrive the amplifier input and drive

the output of the amplifier into the rails, resulting in a long overload recovery time. Common mode capacitors C7,

C9 and differential capacitor C8are used to filter the common mode and differential voltage spikes.

For switching applications or where fast transients are caused by hot plugging the source or load, external

protection components may be needed. The external current limiting resistor (R6) in Figure 4 limits the peak

current through the internal ESD diodes to <20mA. This condition can occur in applications that experience high

levels of in-rush current causing high peak voltages that can damage the internal ESD diodes of the ISL28005. If

the current limiting resistor is required, it needs to be placed on the RS- input (R6). Placing it on the RS+ input side

(R7) will result in a much larger error voltage due to the ISL28005 taking its supply current from the sense current

in high-side applications.

For example:

Current limiting resistor R6with a value of 100Ωprovides protection for a 2V transient with the maximum of 20mA

flowing through the input while adding only an additional 13µV (worst case over-temperature) of VOS as shown in

Equation 1. Note: Worst case over-temperature input bias current on the RS- input is 130nA.

Current limiting resistor R7with value of 100Ωprovides the same transient protection, but with an error voltage of

800µV. Note: Worst case over-temperature input bias current on the RS+ input is 8µA as shown in Equation 2.

R7is a carry-over from our characterization board and was used to measure input bias current. The evaluation

board is populated with a 0Ωresistor for R7.

1.2 Power Supplies

External power connections are made through the VS+ and Ground connections on the evaluation board.

Capacitors C2and C4perform two duties, de-coupling the supplies and with R15, filtering of the power supply

noise. Anti-reverse diodes D1and D3protect the circuit in the case of accidental polarity reversal of the supply.

Resistor R12 is used to connect ground to the fixed gain parts.

(EQ. 1)

(EQ. 2)

R6IRS-

100130nA13V==

R7IRS+

1008A800V==

AN1531 Rev.1.00 Page 4

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

2. Board Design

Figure 2. ISL28005FH-100EVAL1Z Evaluation Board (Top)

Figure 3. ISL28005FH-100EVAL1Z Evaluation Board (Bottom)

AN1531 Rev.1.00 Page 5

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

2.1 Schematic Diagram

The ISL2800XEVAL1Z evaluation board is configured with either the ISL28005-100, ISL28005-50, or

ISL28005-20 device.

Figure 1 shows the basic application circuit and optional protection components for the fixed gain parts. Figure 4

shows the complete schematic for the ISL2800XEVAL1Z evaluation board.

Components shown in red in Figure 4 are optional transient protection and not required for clean environments.

Note: The evaluation board comes equipped with the transient protection devices.

Figure 4. ISL28005xEVAL1Z Schematic Diagram

I-SENSE-

ARE FOR KELVIN CONNECTIONS

R16-R20 AND R21-R25

I-SENSE+

GND VS+

V-REF

I-SENSE

OUT

1000pF

J4 1

R16

DNP

R17

R18

DNP

R19

R20

DNP

R25

DNP

R24

0.10

DNP

R23

DNP

R22

12 D3

S1AB

R13

DNP

R14

R11

DNP

R12

DNP

OPEN

100

S1AB

0.01µF

1µF

SOT23_5

OPEN

J2 1

C10

R15

C20

J1 1

R10

R26

DNP

1000pF

100

0.01µF

DNP

R21

DNP

ISL28005

J13

DNP

Optional Transient Protection

AN1531 Rev.1.00 Page 6

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

2.2 Bill of Materials

2.3 Board Layout

Reference Designator Description Comments

C2 CAP, SMD, 0805, 1µF, 50V, 20%, X7R, ROHS Power Supply Decoupling and Input Filter

C4, C8 CAP, SMD, 0603, 0.01µF, 50V, 10%, X7R, ROHS Power Supply Decoupling/Input Filter and

Differential Current Sense Filter

C7, C9 CAP, SMD, 0603, 1000pF, 50V, 10%, X7R, ROHS Common Mode Current Sense Filter

C10, C20 CAP, SMD, 0603, DNP - Place Holder, ROHS User Selectable Capacitors - Not Populated

D1, D3 Diode-Rectifier, SMD, S1AB, 50V, ROHS Reverse Power Protection

U1 ISL28005FH100Z-T7, SOT-23, ROHS For ISL28005-100EVAL1Z board only

ISL28005FH50Z-T7, SOT-23, ROHS For ISL28005-50EVAL1Z board only

ISL28005FH20Z-T7, SOT-23, ROHS For ISL28005-20EVAL1Z board only

R16, R17, R19 -R22,

R24, R25

Resistor, SMD, 0603, MF, DNP - Place Holder User Selectable Kelvin Connection - Not

Populated

R26 Resistor, SMD, 0603, MF, DNP - Place Holder User Selectable Output Load Resistor -

Not Populated

R3 Resistor, SMD, 2512, 0.1Ω, 1W, 1%, TF, ROHS Sense Resistor

R1, R2, R4, R5 Resistor, SMD, 2512, DNP - Place Holder User Selectable Sense Resistors - Not

Populated

R6, R7, R13, R18, R23 Resistor, SMD, 0603, 0Ω, 1/10W, TF, ROHS Zero Ohm User Selectable Resistors

R15 Resistor, SMD, 0603, 100Ω, 1/10W, TF, ROHS Current Limiting Resistors

Figure 5. Top Layer

AN1531 Rev.1.00 Page 7

Feb 9, 2022

ISL28005xEVAL1Z Evaluation Board Manual

3. Ordering Information

4. Revision History

Figure 6. Bottom Layer

Part Number Description

ISL28005-100EVAL1Z ISL28005 100V/V fixed gain evaluation board

ISL28005-50EVAL1Z ISL28005 50V/V fixed gain evaluation board

ISL28005-20EVAL1Z ISL28005 20V/V fixed gain evaluation board

Revision Date Description

1.00 Feb 9, 2022 Applied new template.

Updated Figure 1.

Added Figures 2, 3, and 6.

Added Ordering Information Tale.

0.00 Feb 18, 2010 Initial release

Corporate Headquarters

TOYOSU FORESIA, 3-2-24 Toyosu,

Koto-ku, Tokyo 135-0061, Japan

www.renesas.com

Contact Information

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office, please visit:

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Electronics Corporation. All trademarks and registered

trademarks are the property of their respective owners.

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(Rev.1.0 Mar 2020)

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