Intersil ISL85003EVAL2Z Manuale utente

ISL85003EVAL2Z, ISL85003AEVAL2Z

Evaluation Board User Guide

AN1930 Rev.1.00 Page 1 of 5

Aug 28, 2014

AN1930

Rev.1.00

Aug 28, 2014

USER’S MANUAL

Description

The ISL85003 and ISL85003A kits are intended for use for

point-of-load applications sourcing from 4.5V to 18V. The kits

are used to demonstrate the performance of the ISL85003

and ISL85003A, low quiescent current high efficiency

synchronous buck regulators.

The ISL85003 and ISL85003A are offered in a 4x3mm dual flat

no lead (DFN) package.

Specifications

The boards are designed to operate at the following operating

conditions:

• Input voltage range from 4.5V to 18V

• Resistor programmable output voltage from 0.8V, ±1%

• Up to 3A output current

• Current mode control

- DCM/CCM

- Internal or external compensation options

- 500kHz switching frequency option

- External synchronization up to 2MHz on ISL85003

• Adjustable soft-start time on the ISL85003A

• Operating junction temperature range: -40°C to +125°C

Quick Setup Guide

1. Ensure that the circuit is correctly connected to the supply

and loads prior to applying any power.

2. Connect the bias supply to VIN, the plus terminal to VIN (P4)

and the negative return to PGND (P5).

3. Connect the output load to V0, the plus terminal to V0 (P8)

and the negative return to PGND (P9).

4. Verify that the position is PWM or PFM for SW2.

5. Verify that the position is ON for SW1.

6. Turn on the power supply.

7. Verify the output voltage is 5V for VO.

Recommended Equipment

The following materials are recommended to perform testing:

• 0V to 25V power supply with at least 10A source current

capability

• Electronic loads capable of sinking current up to 7A

• Digital multimeters (DMMs)

• 100MHz quad-trace oscilloscope

• Signal generator

Key Board Features

•Small,compactdesign

• Switch selectable EN (enabled/disabled)

• Switch selectable MODE (auto-DCM/forced-PWM)

• Connectors and test points for easy probing

References

•ISL85003, ISL85003A datasheet

Evaluating the Other Output

Voltage

The ISL85003 and ISL85003A kit outputs are preset to 5V for

VOUT; however, the output voltages are programmed using an

external resistor divider that scales the feedback relative to the

internal reference voltage. The output voltage programming

resistor, R2, will depend on the value chosen for the feedback

resistor, R1, and the desired regulator output voltage, VOUT.

The value for the feedback resistor R1is typically between

10kΩand 400kΩas shown in Equation 1.

If the output voltage desired is 0.8V, then R2is left

unpopulated. R1is still required to set the low frequency pole

of the modulator compensation.

Switch Control

The ISL85003 and ISL85003A evaluation boards contain SW1

and SW2 for various controls of the ISL85003 and ISL85003A

circuitries. Table 1 details this function.

Ordering Information

PART NUMBER DESCRIPTION

ISL85003EVAL2Z Evaluation Board for ISL85003FRZ and

ISL85003AFRZ

TABLE 1. SWITCH SETTINGS

SW1 ENABLE FUNCTION

1OFFDisableV0

3ONEnableV0

SW2 MODE FUNCTION

1DCMForceDCM

3 PWM Fixed PWM frequency at light load

R10.8V

VOUT 0.8V–

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

=(EQ. 1)

ISL85003EVAL2Z, ISL85003AEVAL2Z

AN1930 Rev.1.00 Page 2 of 5

Aug 28, 2014

Components Selection

VOUT 0.8V 1V 1.2V 1.5V 1.8V 2.5V 3.3V 5V

C1, C210µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF

C522µF 22µF 22µF 47µF 47µF 47µF 47µF 47µF

C622µF 22µF 22µF 22µF 22µF 22µF 22µF 22µF

C4Open Open Open 4.7pF 4.7pF 4.7pF 4.7pF 4.7pF

L11.8µH 2.2µH 2.2µH 3.3µH 3.3µH 3.3µH 4.7µH 4.7µH

R1301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ

R2Open 1.2MΩ604kΩ344kΩ241kΩ142kΩ96.3kΩ57.6kΩ

NOTE: VIN = 12V, IOUT = 3A; The components selection table is a suggestion for typical application using internal compensation mode. For applications

that require high output capacitance greater than 200µF, R1should be adjusted to maintain a loop response bandwidth about 40kHz.

ISL85003EVAL2Z Evaluation Board

FIGURE 1. TOP VIEW FIGURE 2. BOTTOM VIEW

AN1930 Rev.1.00 Page 3 of 5

Aug 28, 2014

ISL85003EVAL2Z, ISL85003AEVAL2Z

ISL85003EVAL2Z Rev B Schematic

VCC

VOUT

SYNC

OFF

VIN

SYNC

DCM

PWM ON

VCCVCC

VOUT

DNP

10uF

0.1uF

SW2

4.7p

SW1

DNP

ENABLE

47uF

C10

150uF

2N7002

200k

57.1k

DNP

VCC

22uF

SYNC

10uF

R11

DNP

200k

DNP P8

VOUT

4.7uH

LTST-C190KGKT

VIN

R14

200k

301k

1uF

GND

DNP

ISL85003

COMP

AGND

6PHASE 7

PHASE 8

VIN 9

VIN 10

VDD 11

BOOT 12

EPAD

SYNC

PHASE

GND

VOUT

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 document is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

AN1930 Rev.1.00 Page 4 of 5

Aug 28, 2014

ISL85003EVAL2Z, ISL85003AEVAL2Z

Bill of Materials

PART NUMBER QTY UNITS

REFERENCE

DESIGNATOR DESCRIPTION MFR MFR PART #

ISL85003FRZ 1 ea U1 IC-3A BUCK REGULATOR, 12P, DFN, 4X3,

ROHS

INTERSIL ISL85003FRZ

ISL85003AFRZ 1 ea U1 IC-3A BUCK REGULATOR PWM, 12P, DFN, 4X3,

ROHS

INTERSIL ISL85003AFRZ

EEE-FK1H151P-T 1 ea C10 CAP, SMD, 10.3mm, 150µF, 50V, 20%, ROHS,

ALUM.ELEC.

PANASONIC EEE-FK1H151P

H1044-004R7-50VR25-T 1 ea C4 CAP, SMD, 0402, 4.7pF, 50V, 0.25pF, NPO,

ROHS

MURATA GRM36COG4R7C050AQ

H1044-DNP 0 ea C7, C8, CSS CAP, SMD, 0402, DNP-PLACE HOLDER, ROHS

H1045-00104-50V10-T 1 ea C3 CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS AVX 06035C104KAT2A

H1045-00105-16V10-T 1 ea C9 CAP, SMD, 0603, 1µF, 16V, 10%, X5R, ROHS MURATA GRM188R61C105KA12D

H1065-00106-25V10-T 2 ea C1, C2 CAP, SMD, 1206, 10µF, 25V, 10%, X7R, ROHS VENKEL C1206X7R250-106KNE

H1065-00226-25V10-T 2 ea C5, C6 CAP, SMD, 1206, 22µF, 25V, 10%, X5R, ROHS MURATA GRM31CR61E226KE15L

RLF7030T-4R7M3R4 1 ea L1 COIL-PWR INDUCTOR, SMD, 7.3X6.8mm,

4.7µH, 20%, 3.5A, ROHS

TDK RLF7030T-4R7M3R4

131-4353-00 2 ea J1, J2 CONN-SCOPE PROBE TEST PT, COMPACT, PCB

MNT, ROHS

TEKTRONIX 131-4353-00

1514-2 4 ea P4, P5, P8, P9 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 1514-2

5002 4 ea P1, P2, P6, P7 CONN-MINI TEST POINT, VERTICAL, WHITE,

ROHS

KEYSTONE 5002

BAT54C-T 1 ea D2 DIODE-RECTIFIER, SMD, SOT23, 3P, 30V,

200mA, ROHS

FAIRCHILD BAT54C

LTST-C190KGKT-T 1 ea D1 LED, SMD, 0603, GREEN CLEAR, 2V, 20mA,

571nm, 35mcd, ROHS

LITEON/VISHAY LTST-C190KGKT

2N7002LT1G-T 1 ea Q1 TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23,

60V, 115mA, ROHS

SEMICONDUCTOR

2N7002LT1G

H2510-00R00-1/16W-T 1 ea R11 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL CR0402-16W-00T

H2510-03013-1/16W1-T 1 ea R1 RES, SMD, 0402, 301k, 1/16W, 1%, TF, ROHS YAGEO RC0402FR-07301KL

H2510-05762-1/16W1-T 1 ea R2 RES, SMD, 0402, 57.6k, 1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF5762X

H2510-DNP 0 ea R3 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS

H2511-00200-1/10W1-T 1 ea R4 RES, SMD, 0603, 20Ω, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF20R0V

H2511-02001-1/10W1-T 1 ea R5 RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS KOA RK73H1JTTD2001F

H2511-02003-1/10W1-T 3 ea R6, R7, R14 RES, SMD, 0603, 200k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2003FT

H2511-DNP 0 ea R8, R9 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS

GT11MSCBE-T 2 ea SW1, SW2 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-

ON, ROHS

ITT INDUSTRIES/

C&K DIVISION

GT11MSCBE

SJ-5003-BLACK 4 ea Bottom four

corners

BUMPONS, 0.44inW x 0.20inH, DOMETOP,

BLACK

3M SJ-5003SPBL

All trademarks and registered trademarks are the property of their respective owners.

ISL85003EVAL2Z, ISL85003AEVAL2Z

AN1930 Rev.1.00 Page 5 of 5

Aug 28, 2014

PCB Layout

FIGURE 3. TOP LAYER FIGURE 4. INNER LAYER 1

FIGURE 5. INNER LAYER 2 FIGURE 6. BOTTOM LAYER

Mouser Electronics

Authorized Distributor

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