Intersil ISL78205EVAL1Z Manual

ISL78205EVAL1Z Evaluation Board Setup Procedure

The ISL78205EVAL1Z board demonstrates the

synchronous/asynchronous buck operation of the ISL78205. The

board input voltage range is 3V to 40V.

The output voltage is set to 5V and can be changed by altering

the feedback resistors R3 and R4. Note that to increase the

output voltage, the output capacitors' voltage rating needs to be

checked.

The board's output current is 2A typical. The board is set with

default 3.6A OC threshold. The OC threshold can be programmed

by R15 placed at the ILIMIT pin.

The ISL78205EVAL1Z board is configured as a synchronous buck

and can be configured to an asynchronous buck. The board is set

to a default switch frequency of 500kHz. The frequency can be

programmed by R8 at the FS pin.

The board can be synchronized with an external clock. Multiple

ISL78205EVAL1Z boards can be synchronized simply by

connecting their SYNC pins together.

Recommended Equipment

• 0V to 40V power supply with 3A source current

• Load capable of sinking 3A current

•Multimeters

• Oscilloscope

Quick Start-up

Figure 1 shows the board image. Note N/A section shows unused

circuits. The useful buck section is noted inside the block.

1. Connect the power source to inputs J1 (VIN+) and J2 (GND).

Connect the load terminals to buck outputs J3 (VOUT+) and

J4 (GND). Make sure the setup is correct prior to applying any

power or load to the board.

2. Adjust the power source to 12V and turn it on.

3. Verify the output voltage is 5V and use oscilloscope to monitor

the phase node waveforms through J28.

Asynchronous Buck Configuration

To configure the board to asynchronous buck, remove R19 and

change R20 (on bottom of the board) to 0Ωto ensure Q6 is

securely off.

N/A

- Unused Circuits Buck

FIGURE 1. ISL78205EVAL1Z BOARD IMAGE

June 21, 2012

AN1769.0

Application Note 1769

Author:Jun Liu

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 trademark owned by Intersil Corporation or one of its subsidiaries.

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

Application Note 1769

2AN1769.0

June 21, 2012

TABLE 1. CONNECTORS/TEST POINTS DESCRIPTIONS

J1 VIN+, positive terminal of buck inputs.

J2 GND, ground terminal of buck inputs.

J3 VOUT+, positive terminal of buck outputs.

J4 GND, ground terminal of buck outputs.

J5 N/A. Left open.

J6 N/A. Left open.

J7 N/A. Left open.

J8 N/A. Left open.

J9 Test points to monitor buck input. Monitoring purpose only and don’t short it with jumper.

J10 N/A. Left open.

J11 N/A. Left open.

J12 N/A. Left open.

J13 N/A. Left open.

J14 Use this connector to control IC ON/OFF.

J15 Test points to monitor the FB pin. Monitoring purpose only and don’t short it with jumper.

J16 Use it to set up switching frequency. With FS pin connected to VCC or GND, or left open, the IC has default 500kHz frequency. R8

is a placeholder for a resistor to program frequency.

J17 N/A. Left open.

J18 Use it to configure synchronization.

Option 1: to apply external clock for the IC to be synchronized with.

Option 2: to synchronize multiple ISL78205, simply connect those SYNC pins together.

J22 N/A. Left open.

J23 Test points to monitor the COMP pin. Monitoring purpose only and don’t short it with jumper.

J24 N/A. Left open.

J25 Must short it with jumper to provide output feedback connection.

J26, J27 N/A. Left open.

J28 Test points to monitor the buck PHASE node waveforms. For monitoring purposes only. Do Not short with jumper.

J29 Use it to set up the overcurrent limit threshold. With ILIMIT pin connected to VCC or GND or left open, the IC has default of 3.6A OC

threshold. R15 is a placeholder for a resistor to program the OC threshold.

J30, J34 N/A. Left open.

J31 N/A. Left open.

J32 Test points to monitor the LGATE. For monitoring purposes only. Do Not short with jumper.

J33 For asynchronous buck configuration, short with jumper before IC startup will disable the low-side driver after IC startup.

J35 N/A. Left open.

J36 Test points to monitor the buck output voltage. For monitoring purposes only. Do Not short with jumper.

Application Note 1769

3AN1769.0

June 21, 2012

ISL78205EVAL1Z Schematic

NONE APPLICABLE CIRCUITS

OPEN

J25 MUST BE SHORTED

PGOOD

D1 IS AN OPTIONAL DIODE FOR ASYNCHORONOUS BUCK CONFIGURATION

GND

OPEN

+5V/2A

GND

OPEN

VIN+

OPEN

GND

BOOT

VIN+

C19

4.7UF

R15

VOBST_NC

VOUT+

J25

OPEN

51.1K

TP3

OPEN

C27

470PF

TP12

DNP

DR125-100-R

100PF

LGATE

VCC

DNP

TP13

J23

R23

J22

OPEN

J11

J12

R24

OPEN

R25

OPEN

VOUT+

J10

J35

J27

J26

R17

C23

0.1UF

OPEN

5.11K

R20

J16

3TP8

0.022UF

J28

10UF

C11

VCC

J33

VOUT+

NC1

R26

C10

OPEN

SQS462-EN

OPEN

C58

NC2

TP1

DNP

LGATE

J32

OPEN

C20

J34

R18

J13

J31

C18

OPEN

J30

VIN+

VOBST_NC

VCC

OPEN

J36

0.1UF

C16

82UF

TP2

TP10

C22

TP11

C57

J15

NC1

VCC

J14

OPEN

VCC

C28

VCC

ISL78205AVEZ

R19

22UF

EEEFK1K220P

1UF

VIN+

C26

OPEN

2.2UF

J17

OPEN

R16

PHASE

NC2

SYNC

LGATE

BOOT

J29

VCC

33.2K

COMP

DNP

OPEN

J18

OPEN

232K44.2K

10.0UH

5.11K

OPEN

PDS360-13

J24

LGATE

PHASE

ILIMIT

COMP

EPAD

PHASE

BOOT

VIN

SGND

VCC

NC DGND

PGOOD

SYNC

PGND

FIGURE 2. ISL78205EVAL1Z BOARD SCHEMATIC

Application Note 1769

4AN1769.0

June 21, 2012

TABLE 1. BILL OF MATERIALS

REF DES PART NUMBER QTY DESCRIPTION MANUFACTURER

C3 C1608X7R1C105K 1 CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R, ROHS TDK

C57 EEE-FK1K220P 1 CAP, SMD, 8X10.2, 22µF, 80V, 20%, ALUM.ELEC., ROHS PANASONIC

C1 GRM21BR71A475KA

73L

1 CAP, SMD, 0805, 4.7µF, 10V, 10%, X7R,ROHS MURATA

C18, C22 GRM31CR71H225KA

88L

2 CAP, SMD, 1206, 2.2µF, 50V, 10%, X7R, ROHS MURATA

C8 VARIOUS 1 CAP, SMD, 0603, 100pF, 50V, 5%, C0G, ROHS VARIOUS

C16, C23 VARIOUS 2 CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS VARIOUS

C4 VARIOUS 1 CAP, SMD, 0603, 0.022µF, 16V, 10%, X7R, ROHS VARIOUS

C7 C0603X7R500-

471KNE

1 CAP, SMD, 0603, 470pF, 50V, 10%, X7R, ROHS VENKEL

C2, C9, C11, C18, C19,

C20, C26, C27, C28

N/A 0 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS N/A

C5 VARIOUS 1 CAP, SMD, 1206, 10µF, 16V, 10%, X5R, ROHS VENKEL

C10 N/A 0 CAP, SMD, 1206, DNP-PLACE HOLDER, ROHS N/A

C6 N/A 0 CAP, SMD, 1210, DNP-PLACE HOLDER, ROHS N/A

C58 16SVPD82M 1 CAP-OSCON, SMD, 6.9x8.3, 82µF, 16V, 20%, 40mΩ, ROHS SANYO

L1 DR125-100-R 1 COIL-PWR INDUCTOR, SMD, 12.5mm, 10µH, 20%, 5.35A,

ROHS

COOPER/COILTRONICS

D1 PDS360 1 DIODE-SCHOTTKY RECTIFIER, SMD, SMPC, 50V, 3A, ROHS DIODES

U1 ISL78205AVEZ 1 IC-2.5A BUCK CONTROLLER,20P, HTSSOP, ROHS INTERSIL

Q6 SQS462EN-T1-GE3 1 TRANSISTOR-MOS, N-CHANNEL, 8P, PWRPAK, 60V, 8A, ROHS VISHAY

R6, R16, R19 VARIOUS 3 RES, SMD, 0603, 0Ω, 1/10W, ROHS VARIOUS

R3 VARIOUS 1 RES, SMD, 0603, 232k, 1/10W, 1%, ROHS VARIOUS

R7 VARIOUS 1 RES, SMD, 0603, 33.2k, 1/10W, 1%, ROHS VARIOUS

R4 VARIOUS 1 RES, SMD, 0603, 44.2k, 1/10W, 1%, ROHS VARIOUS

R5,R20 VARIOUS 2 RES, SMD, 0603, 5.11k, 1/10W, 1%, ROHS VARIOUS

R2 VARIOUS 1 RES, SMD, 0603, 51.1k, 1/10W, 1%, ROHS VARIOUS

R8,R9, R15, R17, R18,

R23, R24, R25

N/A 0 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS N/A

R1, R26 N/A 0 RES, SMD, 0805, DNP-PLACE HOLDER, ROHS N/A

D2, D3 N/A 0 DO NOT POPULATE OR PURCHASE N/A

L2 N/A 0 DO NOT POPULATE OR PURCHASE N/A

Q5 N/A 0 DO NOT POPULATE OR PURCHASE N/A

C3 C1608X7R1C105K 1 CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R, ROHS TDK

C57 EEE-FK1K220P 1 CAP, SMD, 8X10.2, 22µF, 80V, 20%, ALUM.ELEC., ROHS PANASONIC

C1 GRM21BR71A475KA

73L

1 CAP, SMD, 0805, 4.7µF, 10V, 10%, X7R, ROHS MURATA

C18,C22 GRM31CR71H225KA

88L

2 CAP, SMD, 1206, 2.2µF, 50V, 10%, X7R, ROHS MURATA

Application Note 1769

5AN1769.0

June 21, 2012

ISL78205EVAL1Z Board Layout

FIGURE 1. TOP COMPONENTS SILKSCREEN FIGURE 2. TOP LAYER

FIGURE 3. 2nd LAYER FIGURE 4. 3rd LAYER

ISL78205EVAL1Z

Application Note 1769

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

AN1769.0

June 21, 2012

FIGURE 5. BOTTOM LAYER FIGURE 6. BOTTOM COMPONENTS SILKSCREEN

FIGURE 7. TOP COMPONENT ASSEMBLY

ISL78205EVAL1Z Board Layout (Continued)

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