Intersil ISL62381, ISL62382 User Manual

®

ISL62381, ISL62382 Quad-Output Evaluation

Board User Guide

July 31, 2008 AN1396.0Application 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 R

3

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 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:

• ISL6238xxxEVAL1Z Evaluation Board

• 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

• 4 Electronic Loads

• 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 datasheet waveforms. Table 2 is the
Enable controller truth table.

.

EN1 EN2 START-UP SEQUENCE

Low Low Both Channel outputs OFF simultaneously

Low Float Both Channel outputs OFF simultaneously
Float Low Both Channel outputs OFF simultaneously
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

TABLE 2. ENABLE TRUTH TABLE

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

ISENx

FIGURE 1. RESISTOR CURRENT SENSE CIRCUIT

R

_

V

ROCSET

OCSET

+

For Channel - 1, t h e ISL62381 and ISL62382 monitors th e
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 I
sense resistor R

SENSE

, the value of R

by Equation 1

IOCR

•

SENSE

R

OCSET

-------------------------------------

=

10μ A

Where:

-R

(Ω) is the resistor used to program the

OCSET

overcurrent setpoint

is the output current threshold that will activate the

-I

OC

OCP circuit

-R
R

is current sense resistor (R3 for Channel-1 and

SENSE

for Channel-2)

25

R

SENSE

+

V

RSENSE

R

O

OCSET

I

L

_

and current

OC

is determined

V

O

C

O

(EQ. 1)

1

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.

All other trademarks mentioned are the property of their respective owners.

Copyright Intersil Americas Inc. 2008. All Rights Reserved

Application Note 1396

Take Channel-1 as an example, once the value of R

OCSET

is calculated, follow the following procedure to configure the
resistor current sense circuit:

Step 1: Open the “DCR SENSE” sold er bridge and

connect the “RESISTOR SENSE” solder bridge
on the PCB bottom layer;

Step 2: Remove R7 (R22 for Channel 2);
Step 3: Replace R

Step 4: Replace C

(R25 for Channel 2) with R

3

(C25 for Channel 2) with R

6

SENSE
OCSET;

;

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 V
slew-rate can be trimmed by adjusting the resistors R
for the rising edge, and R
power supply is needed to power the dynamic load
generator.

and GND. The transient load

OUT

, R39 for the falling edge. +12V

38

Step 5: Replace replace R19 (R18 for Channel 2) with

R

OCSET.

Connections and Test Points The following table describes the function and operation of the evaluation boards.

NUMBER NAME FUNCTION/OPERATION

INTERFACES AND CONNECTIONS

TP3 VBAT V
TP4 GND V
TP1 VOUT1 Channel-1 positive power output

TP2 GND Channel-1 return power output
TP11 VOUT2 Channel-2 positive power output
TP12 GND Channel-2 return 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

TEST POINTS

J1 PHASE2 Scope-probe socket for measuring Channel-2 phase node
J3 PHASE1 Scope-probe socket for measuring Channel-1 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 Remove the jumper will float the FCCM pin
J6 FLOAT_EN1 Remove the jumper will float the EN1 pin
J7 FLOAT_EN2 Remove the jumper will float the EN2 pin

TP17 EN1 Test point of EN1 pin

TP8 EN2 Test point of EN2 pin

TP9 LDO3EN Test point of LDO3EN pin
TP10 FCCM Test point of FCCM pin

POWER-GOOD INDICATORS

TP13 PGOOD1 Test point of PGOOD1 pin

TP5 PGOOD2 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

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

positive power input

IN

return power input

IN

voltage.

34

, R40

2

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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

SW2 ON/OFF control of Channel-1 dynamic-load generator. Toggle to ON will enable the dynamic load, toggle OFF will

U2 ON: High level for EN1, EN2, LDO3EN and FCCM, respectively

will disable the transient load

disable the transient load

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

+

-

+

12V

-

-

LDO3

(0.6V~5.5V)

+

VOUT1

+

(0.6V~5.5V)

FIGURE 2. TYPICAL TEST CONFIGURATION

-

+

VIN

(5.5V~25V)

-

PROBE

3

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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.

REFERENCE

NO.

DESIGNATOR QTY VALUE

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,

13 C4, C26 2 330µF 6.3V 10 SANYO-POSCAP SM_POLCAP_SMD, 6TPF330M9L, 330UF,

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
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,

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

6 100k 1/10W 1 GENERIC SM_RES_0603, 100k, 1/10W, 1%, TF, ROHS

VOLTAGE/

POWER

TOL.

(%) MANUFACTURER DESCRIPTION

25V, 20%, CASE-CC

6.3V, 10%, CAP_7343

LED_3x2_5MM

(Pb-free)

4

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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)

REFERENCE

NO.

DESIGNATOR QTY VALUE

35 Q3, Q5 2 IRF7832PBF IR 30V 20A N-Channel HEXFET Power MOSFET

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,

38 SW1, SW2 2 GT11MSCBE-T C&K GT11MSCKE_SMT-GT11MSCBE-T,

39 TP5, TP6, TP7, TP8,

TP9, TP10, TP13,
TP14, TP15, TP16,
TP17, TP18, TP19,

40 TP1, TP2, TP3, TP4,

TP11, TP12

41 J1, J2, J3, J5 4 131-5031-00 TEKTRONIX SCOPE_PROBE_5P_CONN-131-5031-00,

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

45 U3, U4 2 HIP2100IBZ INTERSIL HIP2100_SOIC-HIP2100IBZ,SOIC8_150_50
46 L1, L2 2 4.7µH 20% VISHAY VISHAY_IHLP_5050CE_SMT-20%-IHLP-

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

52 C5, C27, C33, C34,

C35, C36
53 R4, R26, R36, R41 4 No-pop
54 Q7, Q8, Q9, Q14 4 No-pop

14 5002 KEYSTONE TEST_POINT_THOLE-5002,MTP500X

6 1514-2 KEYSTONE TEST_POINT_THOLE-1514-2,TP-150C100P

(ISL62382HRTZ)

6 No-pop

VOLTAGE/

POWER

TOL.

(%) MANUFACTURER DESCRIPTION

(Pb-FREE)

TO-252AA

GT13MSCKE

TEK131-5031-00

INTERSIL ISL62381HRTZ, 32 LD 5x5 TQFN

(ISL62382HRTZ, 32 LD 5x5 TQFN)

5050CE-01-4R7M, 4.7µH, 24A, 20%,
VISHAY_IHLP-5050CE

REV #

5

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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 dif ferent bill of materials (BOM). The following table shows the BOM dif ference of ISL62381HIEVAL1Z,
ISL62382HIEVAL1Z in comparison with ISL62381LOEVAL1Z, ISL62382LOEVAL1Z.

REFERENCE

NO.

DESIGNATOR QTY VALUE

1 Q8, Q14 2 IRF7821PBF IR 30V 13.6A N-Channel HEXFET Power MOSFET

2 Q7, Q9 2 IRF7832PBF IR 30V 20A N-Channel HEXFET Power MOSFET

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,

16 L1, L2 2 2.2µH 20 VISHAY VISHAY_IHLP_5050CE_SMT-20%-IHLP-5050CE-

VOLTAGE

/POWER

TOL.

(%) MANUFACTURER DESCRIPTION

(Pb-free)

(Pb-free)

10%, CAP_7343

01-2R2M,2.2µH, 29A, 20%, VISHAY_IHLP­5050CE

6

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7

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ISL6238xxxEVAL1Z Evaluation Board Schematic

ISL62381LOEVAL1Z

04/10/08

REV A

11

Q14

0.68

R35

OPEN

C35

L2

4.7UH

1200PF

R13

C14

1200PF

VOUT1

SUD50N03_07

Q11

Q13

SUD50N03_07

2N7002

IRF7821

Q4

IRF7832

IRF7821

10UF

1UF

R34

200

SW1

BAT54S

SSL_LXA3025IGC

2N7002

Q6

ISL62381HRTZ

R9

OPEN

C36

OPEN

R23

TP16

R38

TP5

R10

C9

C19

L1

R3

R7C6

R37

R36

J7

J6

R19

R16

R41

C8

U1

R39

R40

R25

R14

C25R22

R18

R4

R26

D4

C16

R2

R27

R8

C7

R11

R12

C17

D1

D2

TP20

R17

R20

C18

U4

U3

R32 R33

Q10

C31

C32

SW2

TP19

D3

Q12

TP13

R28

R5

R6

C24

Q8

Q5

TP14

TP15

C21

TP7

C11

C13

C15

Q2

Q7 Q3

U2

J3

J1

TP17

TP8

TP9

TP10

R31

R21

R24

C34

C22

C23

C30

TP6

TP18

Q1

R15

J5

R29

C10

TP3

C12

Q9

TP2

TP1

C1

C2

C33

C4

C5

TP11

TP12

C29

C28

C26

C27

J4

1.58K

10K

VCC1

0.22UF

0.01UF

0.22UF

10UF

2N7002

LDO3EN

EN1

EN2

OPEN

100K

78B04S

1UF

4.7UF

10UF

0.022UF

PHASE2

1UF

45.3K

15.8K

15.8K

15.8K

68.1K

LDO5

0

OPEN

EN2

750

PHASE2

10UF

VCC1

PHASE1

100K

0

VOUT11KVOUT2

200

0

1K

EN1

10UF

9.09K

100K

2N7002

4.7UH

LDO3EN

10UF

HIP2100

10UF

1K

1UF

0

LDO5

0

HIP2100

10UF

OPEN

0.47

499

OPEN

19.6K

BAT54S

499

1UF

48.7K

750

15.8K

OPEN

100K

100K

LDO3

10K

LDO5

FCCM

100K

VOUT2

SSL_LXA3025IGC

OPEN

LDO3FB

17.4K

48.7K

0.01UF

24.3K

OPEN

4.7UF

VOUT1

4.7UF

330UF

4.7UF

4.7UF

330UF

VOUT2

OPEN

OPEN

OPEN

OPEN

R1

J2

C3

56UF

TP4

0.022UF

IRF7832

PHASE1

4.7UF

C20

R30

FCCM

1

2

EP

FB1

OCSET2

FB2

VOUT2

ISEN2

EN2

PHASE2

UGATE2

BOOT2

LGATE2

PGND

LDO5

VIN

LDO3IN

LDO3

LDO3FB

LGATE1

BOOT1

UGATE1

PHASE1

EN1

OCSET1

ISEN1

VOUT1

PGOOD1

FSET1

FSET2

PGOOD2

FCCM

VCC2

LDO3EN

VCC1

RED

GRN

1

2

1

2

HI

LO

HS

HO

LI

VSS

VDD

HB

+12V

HI

LO

HS

HO

LI

VSS

VDD

HB

VBAT

VBAT

VBAT

VBAT

RED

GRN

TITLE:

ENGINEER:

DRAWN BY:

SHEET:

DATE:

REV:

OF

E

D

C

B

A

765432

1

E

D

C

B

A

FF

8

Application Note 1396

Application Note 1396

ISL6238xxxEVAL1Z Evaluation Board Layout

FIGURE 3. TOP SILKSCREEN

8

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Application Note 1396

ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)

FIGURE 4. BOTTOM SILKSCREEN

9

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Application Note 1396

ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)

10

FIGURE 5. LAYER 1

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Application Note 1396

ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)

11

FIGURE 6. LAYER 2

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Application Note 1396

ISL6238xxxEVAL1Z Evaluation Board Layout (Continued)

12

FIGURE 7. LAYER 3

AN1396.0

July 31, 2008

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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