an1396

ISL62381, ISL62382 Quad-Output Evaluation
Board User Guide
®
Application Note
Introduction
.
The ISL62381 and ISL62382 evaluation boards demonstrate
the performance of ISL62381 and ISL62382 Quad-output
controllers. The ISL62381 and ISL62382 controller include
two pulse-width modulation (PWM) controllers featured with
Intersil’s patented R3 technology, adjustable from 0.6V to
5.5V, and two linear regulators, LDO5 and LDO3, that
generate a fixed 5V and an adjustable output respectively.
The evaluation board includes two independent Enable
switches, two LED Power-Good indicators and various test
points. Included with each switching channel is an on-board
dynamic load generator for evaluating the transient-load
response. There are four different evaluation boards which
provide flexible evaluation options. Table 1 shows a brief
description of the evaluation boards.
TABLE 1. EVALUATION BOARD DESCRIPTION
EVALUATION BOARD
July 31, 2008
CHANNEL-1
CHANNEL-2
OCP
ISL62381LOEVAL1Z
3.3V/8A
5V/8A
~10A
ISL62381HIEVAL1Z
1.05V/15A
1.5V/15A
~20A
ISL62382LOEVAL1Z
3.3V/8A
5V/8A
~10A
ISL62382HIEVAL1Z
1.05V/15A
1.5V/15A
~20A
What’s Inside
The Evaluation Board Kit contains the following materials:
AN1396.0
TABLE 2. ENABLE TRUTH TABLE
EN1
EN2
START-UP SEQUENCE
Low
Low
Low
Float Both Channel outputs OFF simultaneously
Float
Low
Float
Float Both Channel outputs OFF simultaneously
Low
High
Channel-1 OFF, Channel-2 ON
High
Low
Channel-1 ON, Channel-2 OFF
High
High
Both Channel outputs ON simultaneously
Float
High
Channel-1 enabled after Channel-2 is in regulation
High
Float Channel-2 enabled after Channel-1 is in regulation
Both Channel outputs OFF simultaneously
Both Channel outputs OFF simultaneously
Resistor Current Sense Configuration
The evaluation board is pre-configured with inductor DCR
current sense. For more precise overcurrent protection, it
also provides the option of resistor current sense. Figure 1
shows the configuration for resistor current sense.
L
PHASEx
ISL62381
ISL62382
10µA
OCSETx
IL
VO
_
+
VRSENSE
CO
ROCSET
_
+
VROCSET
• ISL6238xxxEVAL1Z Evaluation Board
RSENSE
RO
ISENx
• ISL62381 and ISL62382 Datasheet
• ISL62381 And ISL62382 Evaluation Board User Guide
(this document)
What’s Needed
The following materials will be needed to perform testing:
• Adjustable +25V, 30A Power Supply
• +12V, 100mA Power Supply
• Precision digital multi-meter
FIGURE 1. RESISTOR CURRENT SENSE CIRCUIT
For Channel-1, the ISL62381 and ISL62382 monitors the
OCSET1 pin and the ISEN1 pin voltages. Once the OCSET1
pin voltage is higher than the ISEN1 pin voltage for more than
10µs, the ISL62381 and ISL62382 declare an overcurrent
fault. For a chosen overcurrent, set point IOC and current
sense resistor RSENSE, the value of ROCSET is determined
by Equation 1
I OC • R SENSE
R OCSET = ------------------------------------10μA
• 4 Electronic Loads
• 4-Channel Oscilloscope
(EQ. 1)
Where:
Enable Control
The evaluation board provides flexible control logic to enable
or disable the outputs, and to program the two PWM
channels’ start-up sequence. For start-up timing sequence,
please refer to the datasheet waveforms. Table 2 is the
Enable controller truth table.
1
- ROCSET (Ω) is the resistor used to program the
overcurrent setpoint
- IOC is the output current threshold that will activate the
OCP circuit
- RSENSE is current sense resistor (R3 for Channel-1 and
R25 for Channel-2)
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1396
Take Channel-1 as an example, once the value of ROCSET
is calculated, follow the following procedure to configure the
resistor current sense circuit:
Step 1:
Open the “DCR SENSE” solder bridge and
connect the “RESISTOR SENSE” solder bridge
on the PCB bottom layer;
Step 2:
Remove R7 (R22 for Channel 2);
Step 3:
Replace R3 (R25 for Channel 2) with RSENSE;
Step 4:
Replace C6 (C25 for Channel 2) with ROCSET;
Step 5:
Replace replace R19 (R18 for Channel 2) with
ROCSET.
Connections and Test Points
NUMBER
Dynamic Load Generator
The evaluation board provides each PWM channel an
on-board dynamic load generator for evaluating the
transient-load response, which are controlled by SW1 and
SW2 respectively. The dynamic load generator applies a
300µs pulse load across VOUT and GND. The transient load
slew-rate can be trimmed by adjusting the resistors R34, R40
for the rising edge, and R38, R39 for the falling edge. +12V
power supply is needed to power the dynamic load
generator.
The following table describes the function and operation of the evaluation boards.
NAME
FUNCTION/OPERATION
INTERFACES AND CONNECTIONS
TP3
VBAT
VIN positive power input
TP4
GND
VIN return power input
TP1
VOUT1
TP2
GND
Channel-1 positive power output
Channel-1 return power output
TP11
VOUT2
TP12
GND
Channel-2 positive power output
TP20
+12V
+12V positive power input, used for the power supply of the on-board dynamic-load generator
TP19
GND
+12V return power input
Channel-2 return power output
TEST POINTS
J1
PHASE2
Scope-probe socket for measuring Channel-2 phase node
J3
PHASE1
J2
VOUT1
Scope-probe socket for measuring Channel-1 output
J5
VOUT2
Scope-probe socket for measuring Channel-2 output
J4
FLOAT_FCCM
J6
FLOAT_EN1
Remove the jumper will float the EN1 pin
J7
FLOAT_EN2
Remove the jumper will float the EN2 pin
Scope-probe socket for measuring Channel-1 phase node
Remove the jumper will float the FCCM pin
TP17
EN1
Test point of EN1 pin
TP8
EN2
Test point of EN2 pin
TP9
LDO3EN
TP10
FCCM
Test point of LDO3EN pin
Test point of FCCM pin
POWER-GOOD INDICATORS
TP13
PGOOD1
TP5
PGOOD2
Test point of PGOOD1 pin
Test point of PGOOD2 pin
D1
Channel-1 Power-Good indicator. Green when VOUT1 is in regulation.
D2
Channel-2 Power-Good indicator. Green when VOUT2 is in regulation.
LINEAR REGULATORS
TP14
LDO5
LDO5 linear regulator positive power output
TP15
GND
LDO5 linear regulator return power output
TP16
LDO3IN
Input of LDO3 linear regulator. Connect to connected to a voltage greater than the LDO3 set point plus the dropout
voltage.
TP18
LDO3FB
LDO3 linear regulator output voltage feedback test point
TP6
LDO3
LDO3 linear regulator positive power output
TP7
GND
LDO3 linear regulator return power output
2
AN1396.0
July 31, 2008
Application Note 1396
Connections and Test Points
The following table describes the function and operation of the evaluation boards. (Continued)
SWITCHES
SW1
ON/OFF control of Channel-2 dynamic-load generator. Toggle to ON will enable the dynamic load, toggle to OFF
will disable the transient load
SW2
ON/OFF control of Channel-1 dynamic-load generator. Toggle to ON will enable the dynamic load, toggle OFF will
disable the transient load
U2
ON: High level for EN1, EN2, LDO3EN and FCCM, respectively
OFF: Low level for EN1, EN2, LDO3EN and FCCM, respectively
Test Set-up
Figure 2 shows a typical test configuration.
+ VOUT2 (0.6V~5.5V)
+ 5V -
-
+
+
VIN
(5.5V~25V)
LDO3
(0.6V~5.5V)
-
+
PROBE
12V
-
+ VOUT1 (0.6V~5.5V)
FIGURE 2. TYPICAL TEST CONFIGURATION
3
AN1396.0
July 31, 2008
Application Note 1396
ISL62381LOEVAL1Z, ISL62382LOEVAL1Z Evaluation Board Bill of Materials
ISL62381LOEVAL1Z and ISL62382LOEVAL1Z evaluation boards use the same PCB and schematic, thus the same bill of materials except for the
controller U1.
NO.
REFERENCE
DESIGNATOR
QTY
1
C6, C25
2
0.022µF
25V
10
GENERIC
SM_CAP_0603, 0.022µF, 25V, 10%, X7R, ROHS
2
C8, C9
2
0.01µF
16V
10
GENERIC
SM_CAP_0603, 0.01µF, 16V, 10%, X7R, ROHS
3
C17, C19
2
0.22µF
16V
10
GENERIC
SM_CAP_0603, 0.22µF, 16V, 10%, X7R, ROHS
4
C13, C15, C22, C23
4
10µF
25V
10
GENERIC
SM_CAP_1206, 10µF, 25V, 10%, X7R, ROHS
5
C12, C14
2
1200pF
16V
10
GENERIC
SM_CAP_0603, 1200PF, 16V, 10%, X7R, ROHS
6
C7, C10
2
1µF
10V
10
GENERIC
SM_CAP_0603, 1µF, 10V, 10%, X7R, ROHS
7
C30
1
1µF
25V
10
GENERIC
SM_CAP_0805, 1µF, 25V, 10%, X7R, ROHS
8
C11, C24
2
1µF
25V
10
GENERIC
SM_CAP_1206, 1µF, 25V, 10%, X7R, ROHS
9
C1, C2, C28, C29
4
4.7µF
10V
10
GENERIC
SM_CAP_0805, 4.7µF, 10V, 10%, X7R, ROHS
10
C20, C21
2
4.7µF
10V
10
GENERIC
SM_CAP_1206, 4.7µF, 10V, 10%, X7R, ROHS
11
C16, C18, C31, C32
4
10µF
16V
10
GENERIC
SM_CAP_0805, 10µF, 16V, 10%, X5R, ROHS
12
C3
1
56µF
25V
20
SANYO-OSCON
RADIAL_POLCAP_RADIAL, 25SP56M, 56µF,
25V, 20%, CASE-CC
13
C4, C26
2
330µF
6.3V
10
SANYO-POSCAP
SM_POLCAP_SMD, 6TPF330M9L, 330UF,
6.3V, 10%, CAP_7343
14
R12, R15
2
750
1/10W
1
GENERIC
SM_RES_0603, 750, 1/10W, 1%, TF, ROHS
15
R11, R30
2
10k
1/10W
1
GENERIC
SM_RES_0603, 10k, 1/10W, 1%, TF, ROHS
16
R14
1
9.09k
1/10W
1
GENERIC
SM_RES_0603, 9.09k, 1/10W, 1%, TF, ROHS
17
R13
1
68.1k
1/10W
1
GENERIC
SM_RES_0603, 68.1k, 1/10W, 1%, TF, ROHS
18
R7, R18, R19, R22
4
15.8k
1/10W
1
GENERIC
SM_RES_0603, 15.8k, 1/10W, 1%, TF, ROHS
19
R29
1
17.4k
1/10W
1
GENERIC
SM_RES_0603, 17.4k, 1/10W, 1%, TF, ROHS
20
R8
1
19.6k
1/10W
1
GENERIC
SM_RES_0603, 19.6k, 1/10W, 1%, TF, ROHS
21
R9
1
24.3k
1/10W
1
GENERIC
SM_RES_0603, 24.3k, 1/10W, 1%, TF, ROHS
22
R16
1
45.3k
1/10W
1
GENERIC
SM_RES_0603, 45.3k, 1/10W, 1%, TF, ROHS
23
R20, R33, R39
3
1k
1/10W
1
GENERIC
SM_RES_0603, 1k, 1/10W, 1%, TF, ROHS
24
R38
1
1.58k
1/10W
1
GENERIC
SM_RES_0603, 1.58k, 1/10W, 1%, TF, ROHS
25
R17, R32
2
48.7k
1/10W
1
GENERIC
SM_RES_0603, 48.7k, 1/10W, 1%, TF, ROHS
26
R1, R2, R10
3
0
1/10W
1
GENERIC
SM_RES_0603, 0, 1/10W, 1%, TF, ROHS
27
R34, R40
2
200
1/10W
1
GENERIC
SM_RES_0603, 200, 1/10W, 1%, TF, ROHS
28
R5, R27
2
499
1/10W
1
GENERIC
SM_RES_0603, 499, 1/10W, 1%, TF, ROHS
29
R6, R21, R23, R24,
R28, R31
6
100k
1/10W
1
GENERIC
SM_RES_0603, 100k, 1/10W, 1%, TF, ROHS
30
R35
1
0.7
1W
1
GENERIC
SM_RES_2512, 0.7, 1W, 1%, TF, ROHS
31
R37
1
0.5
1W
1
GENERIC
SM_RES_2512, 0.5, 1W, 1%, TF, ROHS
32
D1, D2
2
SSL_LXA3025IGC
LUMEX
SSL_LXA3025IGC_SMD-SSL-LXA3025IGC,
LED_3x2_5MM
33
D3, D4
2
BAT54S
DIODES
SM_SCHOTTKY_BAT54S-BAT54S, SOT23
34
Q2, Q4
2
IRF7821PBF
IR
30V 13.6A N-Channel HEXFET Power MOSFET
(Pb-free)
4
VALUE
VOLTAGE/ TOL.
POWER
(%) MANUFACTURER
DESCRIPTION
AN1396.0
July 31, 2008
Application Note 1396
ISL62381LOEVAL1Z, ISL62382LOEVAL1Z Evaluation Board Bill of Materials
ISL62381LOEVAL1Z and ISL62382LOEVAL1Z evaluation boards use the same PCB and schematic, thus the same bill of materials except for the
controller U1. (Continued)
NO.
REFERENCE
DESIGNATOR
QTY
35
Q3, Q5
2
IRF7832PBF
IR
30V 20A N-Channel HEXFET Power MOSFET
(Pb-FREE)
36
Q1, Q6, Q10, Q12
4
2N7002-7-F
FAIRCHILD
2N7002_SOT23-2N7002-7-F,SOT23
37
Q11, Q13
2
SUD50N03-07
VISHAY
SUD50N03_07_TO252-SUD50N03-07,
TO-252AA
38
SW1, SW2
2
GT11MSCBE-T
C&K
GT11MSCKE_SMT-GT11MSCBE-T,
GT13MSCKE
39
TP5, TP6, TP7, TP8,
TP9, TP10, TP13,
TP14, TP15, TP16,
TP17, TP18, TP19,
14 5002
KEYSTONE
TEST_POINT_THOLE-5002,MTP500X
40
TP1, TP2, TP3, TP4,
TP11, TP12
6
1514-2
KEYSTONE
TEST_POINT_THOLE-1514-2,TP-150C100P
41
J1, J2, J3, J5
4
131-5031-00
TEKTRONIX
SCOPE_PROBE_5P_CONN-131-5031-00,
TEK131-5031-00
42
J4, J6, J7
3
68000-236
FCI
CONN2_DIP2-68000-236, CONN2
43
U2
1
78B04S
GRAYHILL
DIP_SW4_SPST_DIP-78B04S, DIP8-SW4
44
U1
1
ISL62381HRTZ
(ISL62382HRTZ)
INTERSIL
ISL62381HRTZ, 32 LD 5x5 TQFN
(ISL62382HRTZ, 32 LD 5x5 TQFN)
45
U3, U4
2
HIP2100IBZ
INTERSIL
HIP2100_SOIC-HIP2100IBZ,SOIC8_150_50
46
L1, L2
2
4.7µH
47
R3, R25
2
Wire
GENERIC
Wire short
48
DCR SENSE
4
Wire
GENERIC
Wire short
49
Jumper Connector
3
SPC02SYAN
SULLINS
Connector Jumper for J4, J6, J7
50
1
PCB
TBD
ISL62381EVAL1ZREVA PCB
51
1
Label
TBD
LABEL, FOR SERIAL NUMBER AND BOM
REV #
VALUE
52
C5, C27, C33, C34,
C35, C36
6
No-pop
53
R4, R26, R36, R41
4
No-pop
54
Q7, Q8, Q9, Q14
4
No-pop
5
VOLTAGE/ TOL.
POWER
(%) MANUFACTURER
20% VISHAY
DESCRIPTION
VISHAY_IHLP_5050CE_SMT-20%-IHLP5050CE-01-4R7M, 4.7µH, 24A, 20%,
VISHAY_IHLP-5050CE
AN1396.0
July 31, 2008
Application Note 1396
ISL62381HIEVAL1Z, ISL62382HIEVAL1Z Evaluation Board Bill of Materials
The ISL62381HIEVAL1Z, ISL62382HIEVAL1Z evaluation boards use the same PCB and schematic as the ISL62381LOEVAL1Z,
ISL62382LOEVAL1Z evaluation boards but different bill of materials (BOM). The following table shows the BOM difference of ISL62381HIEVAL1Z,
ISL62382HIEVAL1Z in comparison with ISL62381LOEVAL1Z, ISL62382LOEVAL1Z.
NO.
REFERENCE
DESIGNATOR
QTY
1
Q8, Q14
2
IRF7821PBF
IR
30V 13.6A N-Channel HEXFET Power MOSFET
(Pb-free)
2
Q7, Q9
2
IRF7832PBF
IR
30V 20A N-Channel HEXFET Power MOSFET
(Pb-free)
3
R8
1
14k
1/10W
1
GENERIC
SM_RES_0603, 14k, 1/10W, 1%, TF, ROHS
4
R9
1
17.4k
1/10W
1
GENERIC
SM_RES_0603, 17.4k, 1/10W, 1%, TF, ROHS
5
R11
1
23.2k
1/10W
1
GENERIC
SM_RES_0603, 23.2k, 1/10W, 1%, TF, ROHS
6
R16
1
17.8k
1/10W
1
GENERIC
SM_RES_0603, 17.8k, 1/10W, 1%, TF, ROHS
7
R13
1
15k
1/10W
1
GENERIC
SM_RES_0603, 15k, 1/10W, 1%, TF, ROHS
8
R14
1
10k
1/10W
1
GENERIC
SM_RES_0603, 10k, 1/10W, 1%, TF, ROHS
9
R7, R18, R19, R22
4
16.2k
1/10W
1
GENERIC
SM_RES_0603, 16.2k, 1/10W, 1%, TF, ROHS
10
R35
1
0.2
1W
1
GENERIC
SM_RES_2512, 0.2, 1W, 1%, TF, ROHS
11
R37
1
0.1
1W
1
GENERIC
SM_RES_2512, 0.1, 1W, 1%, TF, ROHS
12
R38
1
4.02k
1/10W
1
GENERIC
SM_RES_0603, 4.02k, 1/10W, 1%, TF, ROHS
13
R12, R15
2
590
1/10W
1
GENERIC
SM_RES_0603, 590, 1/10W, 1%, TF, ROHS
14
C12, C14
2
1800pF
16V
10
GENERIC
SM_CAP_0603, 1800PF, 16V, 10%, X7R, ROHS
15
C33, C36
2
330µF
6.3V
10
SANYO-POSCAP
SM_POLCAP_SMD, 6TPF330M9L, 330µF, 6.3V,
10%, CAP_7343
16
L1, L2
2
2.2µH
20
VISHAY
VISHAY_IHLP_5050CE_SMT-20%-IHLP-5050CE01-2R2M,2.2µH, 29A, 20%, VISHAY_IHLP5050CE
VALUE
6
VOLTAGE TOL.
/POWER (%) MANUFACTURER
DESCRIPTION
AN1396.0
July 31, 2008
ISL6238xxxEVAL1Z Evaluation Board Schematic
R2
LDO5
F
15.8K
R30
C17
TP18
0.22UF
45.3K
1UF
VOUT1
J5
VOUT2
J3
PHASE1
J1
PHASE2
C3
0
J6
1 2
EN1
J7
1 2
EN2
J4
1 2
FCCM
U2
100K
PHASE1
100K
R24
4.7UH
LDO3EN
TP9
100K
R23
L1
0
TP8
B
VCC1
TP10
100K
R21
R3
Q14
R31
R7
15.8K
TP17
IRF7821
Q2
78B04S
OPEN
OPEN
C34
C5
OPEN
C33
C4
330UF
4.7UF
C1
4.7UF
C2
VOUT1
TP1
C6
0.022UF
4.7UF
J2
C
R1
B
OPEN
OPEN
C26
TP7
10UF
10UF
C15
C11
HIP2100
TP12
VBAT
TP19
D
TP16
TP4
1UF
C13
SW2
R37
HI
R36
LI
HS
OPEN
VSS
HO
R16
SUD50N03_07
BAT54S
LO
TP11
TP6
VBAT
15.8K
Q11
200
1.58K
U3
C32
D3
R19
R34
R38
1UF
TP3
0.47
C
HB
750
VOUT1
VDD
R12
Q10
EN1
10K
C12
C31
2N7002
R11
VOUT2
C30
4.7UF
C29
LGATE1
Q9
330UF
C28
LDO3FB
4.7UF
LDO3
LDO3
PGOOD1
1200PF
1K
E
OPEN
OPEN
C27
VIN
LDO3IN
FSET1
10UF
R33
0
TP15
TP14
LDO5
56UF
U1
ISL62381HRTZ
LDO3EN
24.3K
IRF7832
Q5
OPEN
C36
LDO5
VCC1
R25
C21
C35
FCCM
EP
R32
10UF
C24
C22
750
PGND
VCC2
VCC1
LDO3EN
1UF
R9
L2
4.7UH
4.7UF
R35
FCCM
FSET2
R29
C8
0.01UF
SW1
HIP2100
48.7K
C25
0.022UF
VBAT
LGATE2
17.4K
C9
19.6K
C7
0.01UF
C10
1UF
0.68
HI
R41
HS
OPEN
LI
R22
15.8K
OPEN
Q7
IRF7832
Q3
TP2
A
REV:
ENGINEER:
DATE:
DRAWN BY:
SHEET:
ISL62381LOEVAL1Z
AN1396.0
July 31, 2008
8
7
6
5
4
3
2
A
TITLE:
REV A
04/10/08
1
1
OF
1
Application Note 1396
HO
PGOOD2
10K
C20
LO
VSS
0
R8
LDO3FB
BAT54S
FB2
VOUT2
ISEN2
OCSET2
EN2
PHASE2
UGATE2
BOOT2
Q13
SUD50N03_07
U4
D4
200
1K
R10
LDO5
FB1
VOUT1
ISEN1
OCSET1
EN1
PHASE1
UGATE1
BOOT1
C18
0.22UF
R40
HB
Q8
PHASE2
R39
VDD
OPEN
C19
VOUT2
10UF
10UF
C23
1200PF
R18
R14
9.09K
TP5
R13
68.1K
R15
C14
100K
R6
R4
SSL_LXA3025IGC
TP13
499
IRF7821
Q4
10UF
Q12
C16
OPEN
R5
499
R28
100K
Q1
EN2
1K
2N7002
10UF
D2
2N7002
Q6
VBAT
R20
48.7K
D
GRN
7
R17
RED
D1
2N7002
+12V
E
GRN
TP20
RED
SSL_LXA3025IGC
R26
0
OPEN
R27
F
Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout
FIGURE 3. TOP SILKSCREEN
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Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 4. BOTTOM SILKSCREEN
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Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 5. LAYER 1
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Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 6. LAYER 2
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Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 7. LAYER 3
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Application Note 1396
ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 8. LAYER 4
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to
verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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