an1397

ISL62391, ISL62392 Triple-Output Evaluation
Board User Guide
®
Application Note
Introduction
.
The ISL62391 and ISL62392 evaluation boards demonstrate
the performance of ISL62391 and ISL62392 triple-output
controllers. The ISL62391 and ISL62392 controllers include
two pulse-width modulation (PWM) controllers featured with
Intersil’s patented R3 technology, output adjustable from
0.6V to 5.5V, and a linear regulator (LDO3) that generates a
fixed 3.3V output and can deliver up to 100mA.
The evaluation board includes two Enable switches, an LED
Power-Good indicator and various test points. Each
switching channel has 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
ISL62391LOEVAL1Z
3.3V/8A
5V/8A
~10A
ISL62391HIEVAL1Z
1.05V/15A
1.5V/15A
~20A
ISL62392LOEVAL1Z
3.3V/8A
5V/8A
~10A
ISL62392HIEVAL1Z
1.05V/15A
1.5V/15A
~20A
AN1397.0
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
The Evaluation Board Kit contains the following materials:
IL
VO
_
+
VRSENSE
ISL62391
ISL62392
What’s Inside
RSENSE
CO
10µA
OCSETx
ROCSET
_
+
VROCSET
• ISL6239xxxEVAL1Z Evaluation Board
RO
ISENx
• ISL62391, ISL62392 Datasheet
• ISL62391, ISL62392 Evaluation Board User Guide (this
document)
What’s Needed
The following materials will be needed in order to perform
testing:
• Adjustable +25V, 30A Power Supply
• +12V, 100mA Power Supply
FIGURE 1. RESISTOR CURRENT SENSE CIRCUIT
For Channel-1, the ISL62391 and ISL62392 monitor 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 ISL62391 and ISL62392 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
• Precision Digital Multimeter
(EQ. 1)
• 3 Electronic Loads
Where:
• 4-Channel Oscilloscope
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 ISL62391, ISL62392 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 1397
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 R28, R34
for the rising edge, and R29, R35 for the falling edge. A +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
VBAT
VIN positive power input
TP4
GND
VIN return power input
TP1
VOUT1
TP3
TP2
GND
TP11
VOUT2
Channel-1 positive power output
Channel-1 return power output
Channel-2 positive power output
TP12
GND
Channel-2 return power output
TP14
+12V
+12V positive power input, used for the power supply of the on-board dynamic-load generator
TP15
GND
+12V return power input
TEST POINTS
J3
PHASE1
Scope-probe socket for measuring Channel-1 phase node
J6
PHASE2
Scope-probe socket for measuring Channel-2 phase node
J2
VOUT1
Scope-probe socket for measuring Channel-1 output
J5
VOUT2
Scope-probe socket for measuring Channel-2 output
J4
FLOAT_FCCM
J7
FLOAT_EN1
J1
FLOAT_EN2
TP13
EN1
TP8
EN2
TP9
LDO3EN
TP10
FCCM
Remove the jumper will float the FCCM pin
Remove the jumper will float the EN1 pin
Remove the jumper will float the EN2 pin
Test point of EN1 pin
Test point of EN2 pin
Test point of LDO3EN pin
Test point of FCCM pin
POWER-GOOD INDICATOR
TP5
PGOOD
D1
Test point of PGOOD pin
Power-Good indicator. Green when VOUT1 and VOUT2 are both in regulation.
LINEAR REGULATOR
TP6
LDO3
LDO3 linear regulator positive power output
TP7
GND
LDO3 linear regulator return power output
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
2
AN1397.0
July 31, 2008
Application Note 1397
Test Set-up
Figure 2 shows a typical test configuration.
VOUT2
(0.6V~5.5V)
+
-
+
LDO3 (3.3V)
+
VIN (5.5V~25V)
-
PROBE
+
12V
-
+
VOUT1 (0.6V~5.5V)
FIGURE 2. TYPICAL TEST CONFIGURATION
3
AN1397.0
July 31, 2008
Application Note 1397
ISL62391LOEVAL1Z, ISL62392LOEVAL1Z Evaluation Board Bill of Materials
ISL62391LOEVAL1Z and ISL62392LOEVAL1Z 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, C21
2
1µF
10V
10
GENERIC
SM_CAP_0603, 1µF, 10V, 10%, X7R, ROHS
7
C11, C24
2
1µF
25V
10
GENERIC
SM_CAP_1206, 1µF, 25V, 10%, X7R, ROHS
8
C1, C2, C10, C28
4
4.7µF
10V
10
GENERIC
SM_CAP_0805, 4.7µF, 10V, 10%, X7R, ROHS
9
C20
1
4.7µF
10V
10
GENERIC
SM_CAP_1206, 4.7µF, 10V, 10%, X7R, ROHS
10
C16, C18, C29, C30
4
10µF
16V
10
GENERIC
SM_CAP_0805, 10µF, 16V, 10%, X5R, ROHS
11
C3
1
56µF
25V
20
SANYO-OSCON
RADIAL_POLCAP_RADIAL, 25SP56M, 56µF,
25V, 20%, CASE-CC
12
C4, C26
2
330µF
6.3V
10
SANYO-POSCAP
SM_POLCAP_SMD, 6TPF330M9L, 330µF, 6.3V,
10%, CAP_7343
13
R12, R15
2
750
1/10W
1
GENERIC
SM_RES_0603, 750, 1/10W, 1%, TF, ROHS
14
R11
1
10k
1/10W
1
GENERIC
SM_RES_0603, 10k, 1/10W, 1%, TF, ROHS
15
R14
1
9.09k
1/10W
1
GENERIC
SM_RES_0603, 9.09k, 1/10W, 1%, TF, ROHS
16
R13
1
68.1k
1/10W
1
GENERIC
SM_RES_0603, 68.1k, 1/10W, 1%, TF, ROHS
17
R7, R18, R19, R22
4
15.8k
1/10W
1
GENERIC
SM_RES_0603, 15.8k, 1/10W, 1%, TF, ROHS
18
R8
1
19.6k
1/10W
1
GENERIC
SM_RES_0603, 19.6k, 1/10W, 1%, TF, ROHS
19
R9
1
24.3k
1/10W
1
GENERIC
SM_RES_0603, 24.3k, 1/10W, 1%, TF, ROHS
20
R16
1
45.3k
1/10W
1
GENERIC
SM_RES_0603, 45.3k, 1/10W, 1%, TF, ROHS
21
R27, R29, R33
3
1k
1/10W
1
GENERIC
SM_RES_0603, 1k, 1/10W, 1%, TF, ROHS
22
R35
1
1.58k
1/10W
1
GENERIC
SM_RES_0603, 1.58k, 1/10W, 1%, TF, ROHS
23
R26, R32
2
48.7k
1/10W
1
GENERIC
SM_RES_0603, 48.7k, 1/10W, 1%, TF, ROHS
24
R1, R2
2
0
1/10W
1
GENERIC
SM_RES_0603, 0, 1/10W, 1%, TF, ROHS
25
R28, R34
2
200
1/10W
1
GENERIC
SM_RES_0603, 200, 1/10W, 1%, TF, ROHS
26
R5
1
499
1/10W
1
GENERIC
SM_RES_0603, 499, 1/10W, 1%, TF, ROHS
27
R6, R10, R21, R23,
R24
5
100k
1/10W
1
GENERIC
SM_RES_0603, 100k, 1/10W, 1%, TF, ROHS
28
R30
1
0.7
1W
1
GENERIC
SM_RES_2512, 0.7, 1W, 1%, TF, ROHS
29
R37
1
0.5
1W
1
GENERIC
SM_RES_2512, 0.5, 1W, 1%, TF, ROHS
30
D1
1
SSL_LXA3025IGC
LUMEX
SSL_LXA3025IGC_SMD-SSLLXA3025IGC,LED_3X2_5MM
31
D2, D3
2
BAT54S
DIODES
SM_SCHOTTKY_BAT54S-BAT54S, SOT23
32
Q2, Q4
2
IRF7821PBF
IR
30V 13.6A N-Channel HEXFET Power MOSFET
(Pb-free)
33
Q3, Q5
2
IRF7832PBF
IR
30V 20A N-Channel HEXFET Power MOSFET
(Pb-free)
34
Q1, Q10, Q12
3
2N7002-7-F
FAIRCHILD
2N7002_SOT23-2N7002-7-F, SOT23
4
VALUE
VOLTAGE/ TOL.
POWER
(%) MANUFACTURER
DESCRIPTION
AN1397.0
July 31, 2008
Application Note 1397
ISL62391LOEVAL1Z, ISL62392LOEVAL1Z Evaluation Board Bill of Materials
ISL62391LOEVAL1Z and ISL62392LOEVAL1Z 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
Q11, Q13
2
SUD50N03-07
VISHAY
SUD50N03_07_TO252-SUD50N03-07, TO252AA
36
SW1, SW2
2
GT11MSCBE-T
C&K
GT11MSCKE_SMT-GT11MSCBE-T, GT13MSCKE
37
TP5, TP6, TP7, TP8,
TP9, TP10,
TP13,TP14, TP15
9
5002
KEYSTONE
TEST_POINT_THOLE-5002, MTP500x
38
TP1, TP2, TP3, TP4,
TP11, TP12
6
1514-2
KEYSTONE
TEST_POINT_THOLE-1514-2,TP-150C100P
39
J2, J3, J5, J6
4
131-5031-00
TEKTRONIX
SCOPE_PROBE_5P_CONN-131-5031-00,
TEK131-5031-00
40
J1, J4, J7
3
68000-236
FCI
CONN2_DIP2-68000-236, CONN2
41
U2
1
78B04S
GRAYHILL
DIP_SW4_SPST_DIP-78B04S, DIP8-SW4
42
U1
1
ISL62391HRTZ,
ISL62392HRTZ
INTERSIL
ISL62391HRTZ, 28 Ld 4x4 TQFN
(ISL62392HRTZ, 28 Ld 4x4 TQFN)
43
U3, U4
2
HIP2100IBZ
INTERSIL
HIP2100_SOIC-HIP2100IBZ, SOIC8_150_50
44
L1, L2
2
4.7µH
VISHAY
VISHAY_IHLP_5050CE_SMT-20%-IHLP5050CE-01-4R7M, 4.7µH,24A,
20%,VISHAY_IHLP-5050CE
45
R3, R25
2
Wire
GENERIC
Wire short
46
DCR SENSE
4
Wire
GENERIC
Wire short
47
Jumper Connector
3
SPC02SYAN
SULLINS
Connector Jumper for J1, J4, J7
48
1
PCB
TBD
ISL6239xEVAL1ZREVA PCB
49
1
Label
TBD
LABEL, FOR SERIAL NUMBER AND BOM REV #
VALUE
50
C5, C27
2
No-pop
51
R4, R31, R36
3
No-pop
52
Q6, Q7, Q8, Q9
4
No-pop
5
VOLTAGE/ TOL.
POWER
(%) MANUFACTURER
20
DESCRIPTION
AN1397.0
July 31, 2008
Application Note 1397
ISL62391HIEVAL1Z, ISL62392HIEVAL1Z Evaluation Board Bill of Materials
The ISL62391HIEVAL1Z, ISL62392HIEVAL1Z evaluation boards use the same PCB and schematic as the ISL62391LOEVAL1Z,
ISL62392LOEVAL1Z evaluation board but different bill of materials (BOM). The following table shows the BOM difference of ISL62391HIEVAL1Z,
ISL62392HIEVAL1Z in comparison with ISL62391LOEVAL1Z, ISL62392LOEVAL1Z.
NO.
REFERENCE
DESIGNATOR
QTY
1
Q6, Q8
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
R30
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
R35
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
C5, C27
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
AN1397.0
July 31, 2008
ISL6239xxxEVAL1Z Evaluation Board Schematic
DESCRIPTION
DATE
APPR.
+12V
R26
R27
48.7K
1K
C30
2N7002
F
Q12
1200PF
19.6K
C7
0.01UF
1UF
C8
R9
0.01UF
FCCM
VCC
LDO3EN
C5
1UF
VOUT1
J5
VOUT2
J3
PHASE1
J6
PHASE2
EN2
J1
1 2
VBAT
TP3
U2
VCC
100K
100K
R24
100K
R23
B
TP4
LDO3EN
78B04S
FCCM
Q3
IRF7832
ENGINEER:
DRAWN
AN1397.0
July 31, 2008
5
4
3
2
A
REV:
ISL62391LOEVAL1Z
6
56UF
J7
1 2
TITLE:
7
C10
C
C3
EN1
A
8
4.7UF
C28
J2
0
J4
2 1
OPEN
4.7UF
C26
R1
10UF
10UF
C15
1UF
C13
PHASE1
Q7
D
TP6
TP13
TP8
TP9
TP10
Q2
IRF7821
4.7UH
TP2
OPEN
10UF
C24
10UF
C23
C22
C19
C20
LDO3
R10
15.8K
L1
TP11
TP12
OPEN
C4
330UF
C2
4.7UF
C1
0
0.022UF
OPEN
VOUT2
1UF
100K
R21
R3
VOUT1
4.7UF
TP1
Q6
R7
0
OPEN
TP7
C11
C6
R25
Q9
Q5
IRF7832
C21
PVCC
VBAT
B
L2
4.7UH
VBAT
4.7UF
R19
45.3K
C12
C
1200PF 750
R16
R12
10K
15.8K
R11
C17
24.3K
TP15
0.22UF
FB2
VOUT2
ISEN2
OCSET2
EN2
PHASE2
UGATE2
C9
C25
0.022UF
330UF
C27
750
R18
15.8K
R13
68.1K
C14
R15
100K
TP5
R6
R4
OPEN
R5
499
BOOT2
PGOOD
FSET2
LGATE2
FCCM
U1
PGND
VCC
ISL62391HRTZ PVCC
VIN
LDO3EN
FSET1
LDO3
LGATE1
FB1
EP
R8
R22
15.8K
VOUT1
ISEN1
OCSET1
EN1
PHASE1
UGATE1
BOOT1
SW2
HIP2100
R37
LO
VSS
LI
HI
BAT54S
R36
C16
VDD
HB
HO
HS
Q11
SUD50N03_07
1.58K
U3
D3
200
0.47
R35
OPEN
BY:
REV A
STEVE LAUR
DATE:
05/14/08
SHEET:
1
1
OF
1
Application Note 1397
R34
D
10UF
R30
R31
VOUT1
Q8
IRF7821
0.22UF
Q10
Q4
EN2
PHASE2
EN1
C29
2N7002
R14
1K
9.09K
48.7K
2N7002
Q1
E
10UF
C18
10UF
R33
VBAT
D1
R32
0
GRN
SW1
HIP2100
R2
RED
LO
VSS
LI
HI
PVCC
SSL_LXA3025IGC
7
VDD
HB
HO
HS
BAT54S
OPEN
U4
Q13
200
1K
0.68
R29
SUD50N03_07
VOUT2
D2
R28
OPEN
F
E
LTR
10UF
TP14
ZONE
Application Note 1397
ISL6239xxxEVAL1Z Evaluation Board Layout
FIGURE 3. TOP SILKSCREEN
8
AN1397.0
July 31, 2008
Application Note 1397
ISL6239xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 4. BOTTOM SILKSCREEN
9
AN1397.0
July 31, 2008
Application Note 1397
ISL6239xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 5. LAYER 1
10
AN1397.0
July 31, 2008
Application Note 1397
ISL6239xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 6. LAYER 2
11
AN1397.0
July 31, 2008
Application Note 1397
ISL6239xxxEVAL1Z Evaluation Board Layout (Continued)
FIGURE 7. LAYER 3
12
AN1397.0
July 31, 2008
Application Note 1397
ISL6239xxxEVAL1Z 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
13
AN1397.0
July 31, 2008
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