Intersil ISL6443AEVAL2Z Installation and operating instructions

AN1391.0

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.

Using the ISL6443AEVAL2Z Evaluation Board

Using the Evaluation Board

The ISL6443A is a high performance triple-output controller

offering control and protection features for 2 synchronous

buck PWMs and 1 linear regulator.

The ISL6443A evaluation board highlights the operation of

the IC in an embedded DC/DC converter application. Table 1

shows the available evaluation board.

Recommended Test Equipment

• A 12V, 5A capable power supply

• An electronic load

• Four channel oscilloscope with probes

• Precision digital multimeters

Power and Load Connections

Input Voltage

To connect a +12V power supply to the evaluation board,

connect the positive lead of the power supply to the VIN (P1)

post and the ground lead of the supply to the GND (P2) post.

The input voltage to the linear controller is already taken

from the 1.8V output of VOUT2.

Output Adjustment

Change the respective output voltage feedback resistors to

modify the output voltage using Equation 1:

Soft-Start and Shutdown

The soft-start capacitors can be adjusted for sequencing of

the output voltages, PWM start-up tracking, and/or to adjust

the start-up current required to charge the output capacitors.

To independently shutdown the PWMs, the SD1 or SD2 pin

can be pulled to GND using the on-board posts, P9 and P10

respectively.

Power Good

When both PWMs are within ±10% of their set value and the

linear regulator output is within 75% of its set value, the

PGOOD signal will go high. The open drain PGOOD pin is

pulled HIGH to VCC_5V on the board. The PGOOD circuitry

monitors the FBx pin of each regulated output to determine if

the outputs are in regulation. PGOOD can be monitored at

post P8.

Overcurrent Protection

The overcurrent thresholds can be adjusted on the

ISL6443A evaluation board. The current sense resistors,

ISENSE, are set at 1.0kΩ. The overcurrent set resistor is

95.3kΩ. The overcurrent trip point can be adjusted by

modifying ROCSET, R5and R10:

ROCSET is the overcurrent set resistor, RCS is the current

sense resistor, IOC is the desired overcurrent trip point, and

rDS(ON) is the ON-resistance of the respective PWM’s lower

MOSFET. Refer to the ISL6443A Data Sheet for more

information on how to select the current sense and

overcurrent select resistors.

TABLE 1. EVALUATION BOARDS

BOARD NAME IC PACKAGE

ISL6443AEVAL2Z ISL6443AIRZ 28 Ld QFN

VOUT1 0.8 1 R1

-------

⎝⎠

⎜⎟

⎛⎞

⋅=VOUT2 0.8 1 R3

-------

⎝⎠

⎜⎟

⎛⎞

⋅=

VOUT3 0.8 1 R6

R11

----------

⎝⎠

⎜⎟

⎛⎞

⋅=(EQ. 1)

tSS PWM1()

C20.8V

5μA

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

⋅=tSS PWM2()

C30.8V

5μA

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

⋅=

(EQ. 2)

ROCSET 7R

⋅

IOC rDS ON()

⋅

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

=(EQ. 3)

Application Note March 10, 2008

2AN1391.0

March 10, 2008

ISL6443AEVAL2Z Schematic

+1.8V, 2A

+3.3V, 2A

PGOOD

+1.2V, 0.2A

+12V

GND

SD1

SD2

GND

C21

10uF

C21

10uF

GND

C34

DNP

C34

DNP

R12

5.11k

R12

5.11k

GND

0.01uF

IRLML6401

6.8uH, 27mOhm

DO3316P-682ML

6.8uH, 27mOhm

DO3316P-682ML L2

6.8uH, 27mOhm

DO3316P-682ML

6.8uH, 27mOhm

DO3316P-682ML

324

Q1A

FDS6912A

Q1A

FDS6912A

10uF

+1.2V

C33

DNP

C33

DNP

0.01uF

C30

220uF, 10V, 40mOhm

10TPB220M

C30

220uF, 10V, 40mOhm

10TPB220M

1uF

100

SD1

P11

PGOOD

P11

PGOOD

+3.3V

BAT54HT1

0.1uF

R11

0.1uF

GND

4.7uF

R10

95.3k

R10

95.3k

C20

10uF

C20

10uF

Q2A

FDS6912A

Q2A

FDS6912A

Q2BQ2B

C31

220uF, 10V, 40mOhm

10TPB220M

C31

220uF, 10V, 40mOhm

10TPB220M

C32

10uF

C32

10uF

806

GND

95.3k

+12V

ISL6443AIRZ

UGATE1

23 PHASE1

22 ISEN1

21 LGATE1

25 PGND

20 FB1

15 SGND

SD1

19 SS1

18 OCSET1

16 FB3

12 GATE3

13 OCSET2

7SS2

SD2 5

SGND 9

FB2 8

LGATE2 26

ISEN2 2

PHASE2 1

UGATE2 28

BOOT2 27

VCC_5V 4

VIN 10

SGND 17

SYNC 11

PGOOD 3

BOOT1 24

SGND

P10

SD1

P10

SD1

Q1BQ1B

1k P5

+1.8V

BAT54HT1

Application Note 1391

3AN1391.0

March 10, 2008

ISL6443AEVAL2Z Bill of Materials

ITEM REFERENCE QTY PART NUMBER PART TYPE DESCRIPTION VENDOR

1 P1 to P12 12 1514-2 Test Point Turret 0.281 Height Keystone

2 D1, D2 2 BAT54HT1G Diode, Schottky 30V, 200mA On Semi

3 C4 1 C1608X5R0J106 Cap, Ceramic, X5R 10µF, 6.3V, 0603, X5R TDK

4 C30, C31 2 10TPB220M Cap, POSCAP 220µF, 10V Panasonic

5 C20, C21 2 C3225X5R1C106KT Cap, Ceramic, 1210 10µF, 16V, 1210, X5R TDK

6 L1, L2 2 DO3316P-682ML SMT Power Inductor 6.8µH, ±20%, 4.6A, 27mΩCoilcraft

7 C1 1 Capacitor, Ceramic, 0603 4.7µF, 20%, 6.3V, 0603 Generic

8 Q1, Q2 2 FDS6912A Dual NFET 6A, 30V, Dual NFET, SO8 Fairchild

9 C5, C7 2 Cap, Ceramic, 0603 0.1µF, 10%, 16V Generic

C2, C3 2 Cap, Ceramic, 0603 0.01µF, 10%, 16V Generic

10 C6 1 Cap, Ceramic, 0603 1.0µF, 10%, 16V Generic

11 C32 1 Cap, Ceramic, 0805 10µF, 10%, 6.3V Generic

12 C33, C34 2 NOT POPULATED -

13 R8 1 Resistor, Film 100Ω, 0603, 1%, 1/16W Generic

14 R1, R3, R6, R7, R9 5 Resistor, Film 1kΩ, 0603, 1%, 1/16W Generic

15 R11 1 Resistor, Film 2kΩ, 0603, 1%, 1/16W Generic

16 R2 1 Resistor, Film 324Ω, 0603, 1%, 1/16W Generic

17 R5, R10 1 Resistor, Film 95.3kΩ, 0603, 1%, 1/16W Generic

18 R12 1 Resistor, Film 5.11kΩ, 0603, 1%, 1/16W Generic

19 R4 1 Resistor, Film 806Ω, 0603, 1%, 1/16W Generic

20 Q3 1 IRLML6401PBF Single NFET Power MOSFET IR

21 U1 1 ISL6443AIRZ 300kHz, Dual PWM

Controller Intersil

ISL6443AEVAL2Z Layout

FIGURE 1. TOP SILK FIGURE 2. TOP LAYER

ISL6443AEVAL2Z

Application Note 1391

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

AN1391.0

March 10, 2008

FIGURE 3. LAYER 2 FIGURE 4. LAYER 3

FIGURE 5. BOTTOM LAYER FIGURE 6. BOTTOM SILK

ISL6443AEVAL2Z Layout (Continued)

Application Note 1391

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