USER’S MANUAL
AN1531
Rev 0.00
February 18, 2010
ISL2800XEVAL1Z
ISL28005 Evaluation Board
AN1531 Rev 0.00 Page 1 of 5
February 18, 2010
Introduction
The ISL28005 evaluation board is a design platform
containing all the circuitry needed to characteriz e
critical performance parameters of the ISL28005 in
either a high side or low-side current sense application.
The ISL28005 is available in fix ed 100V/V, 50V/V,
20V/V gains.
Reference Documents
• ISL28005 Data Sheet, FN6973
Evaluation Board Schematic
The ISL2800XEVAL1Z ev aluati on 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 fix ed gain
parts. Figure 2 shows the complete schematic for the
ISL2800XEVAL1Z ev aluation board.
Components shown in red in Figure 1 are optional
transient protection and not required for clean
environments. Note: The evaluation board comes
equipped with the transient protection devices.
Optional Transient Protection
For appl ications where the load and th e power source
are permanently connected, transient protection is not
required and only an external current sense resistor
(R3) is needed.
For appl ications where fast tr ansients can gener ate
voltage spikes that can overdriv e the amplifier input
and drive the output of the amplifier into the r ails,
resulting in a long overload recovery time. Common
mode capacitors C7, C9 and differential capacitor C8
are used to filter the common mode and differential
voltage spikes.
For swi tching applications or where fast tr ansients are
caused by hot plugging the source or load, external
protection compon ents ma y be n eeded. T he extern al
current limiting resistor (R6) in Figure 1 will limi t the
peak current through the internal ESD di odes to
<20mA. This condition can occur in applications that
experience high levels of in-rush current causin g 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 R6 with a v alue of 100 will
provide protection for a 2V tran sient with the
maximum of 20mA flowing through the input while
adding only an additional 13µV (worst case over -
temperature) of V OS as shown in Equation 1. Note:
W orst case ov er-temperature inpu t bias current on the
RS- input is 130nA.
Current limiting resistor R7 with v alue of 100 will
provide the same transient protection, but with an
error voltage of 800µV. Note: W orst case ov er-
temperature input bias current on the RS+ input is 8µA
as shown in Equation 2.
R7 is a carry -o ver from our char acteri zation board and
was used to measure input bias current. The
evaluati on board is populate d with a zero ohm resistor
for R7.
Power Supplies
External power connections are made through the VS+
and Ground connections on the ev aluation board.
Capacitors C2 and C4 perform two duties, de-coupling
the supplies and with R15, filtering of the power supply
noise. Anti-reverse diodes D1 and D3 protect the circuit
in the case of accidental polarity reversal of the supply.
Resistor R12 is used to connect ground to the fix ed
gain parts.
ISL2800XEVAL1Z and BOM
Figure 3 shows the top view of the ISL2800XEVAL1Z
evaluation board. T h e e valuat ion boa r d B i l l Of
Materials is given in Table 1.
R6IRS-
100130nA13V== (EQ. 1)
R7IRS+
1008A800V== (EQ. 2)
AN1531 Rev 0.00 Page 2 of 5
February 18, 2010
ISL2800XEVAL1Z
FIGURE 1. SIMPLIF IED ISL2800XEVAL1Z SCHEMATIC DIAGRAM
GND VS+
V-REF
I-SENSE
I-SENSE+
OUT
I-SENSE-
0.10
0
1000pF
J5
R26
R18 R23
R12
D3
D1
J1
R15
R13
C10
R3
C4
C2
C9
C7
5
4
3
2
1
U1
J6
J2
R9
J3
R6
R7
C8
J4
OPEN
0
SOT23_5
0
1µF
0.01µF
S1AB
0
S1AB
0
0
0.01µF
100
1000pF
0
DNP
ISL28005
OPTIONAL TRANSIENT PROTECTION
D2
J13
DNP
AN1531 Rev 0.00 Page 3 of 5
February 18, 2010
ISL2800XEVAL1Z
FIGURE 2. ISL280 0XEVAL1Z 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
DNP
R17
R18
0
DNP
R19
R20
DNP
DNP
R5
DNP
R4
DNP
R25
DNP
R24
0.10
DNP
R1
R2
R23
0
DNP
R22
12 D3
S1AB
J5
1
R13
DNP
R14
R11
DNP
DNP
C2
0
R12
DNP
0
OPEN
100
S1AB
0.01µF
1µF
SOT23_5
0
OPEN
J3
R9
R8
J2 1
J6
1
2
3
4
U1
1
2
3
5
C4
C10
R15
C20
J1 1
D1
21
R10
R26
4
DNP
5
C9
1000pF
R7
0
R6
100
C8
0.01µF
C7
DNP
R21
DNP
R3
ISL28005
D2
J13
DNP
AN1531 Rev 0.00 Page 4 of 5
February 18, 2010
ISL2800XEVAL1Z
FIGURE 3. ISL2800XEVAL1Z TOP VIEW
TABLE 1. ISL280 0XEVAL1Z COMPONENTS PARTS LIST
DEVICE # 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, 1000 pF, 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 (ISL28005-100EVAL1Z) ISL28005FH100Z-T7, SOT-23, ROHS
U1 (ISL28005-50EVAL1Z) ISL28005FH50Z-T7, SOT-23, ROHS
U1 (ISL28005-20EVAL1Z) ISL28005FH20Z-T7, SOT-23, ROHS
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, 0.1, 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, 0, 1/10W, TF, ROHS Zero Ohm User Selectable Resistors
R15 Resistor, SMD, 0603, 100, 1/10W, TF, ROHS Current Limiting Resistors
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