Renesas ISL6225EVAL2 User Manual

USER’S MANUAL

EN1

GND

DDR

VSEN1

VIN

PG1

26
25
24
23
22
21

1
2
3
4
5
6
7
8

VCC

27

28

VOUT1

9
10
11
12
13
14

18
17
16
15

19

20

ISEN1

LGATE1

PGND1

BOOT1

UGATE1

PHASE1

ISEN2

LGATE2
PGND2

BOOT2

UGATE2

PHASE2

EN2

VSEN2

VOUT2

OCSET2OCSET1

SOFT1 SOFT2

PG2/REF

ISL6225

SSOP-28

ISL6225EVAL2

Dual Switcher Evaluation Board Setup Procedure

General Description

This document describes the setup procedure for the
ISL6225 Evaluation Board dual switcher implementation.
The ISL6225 can control two output voltages adjustable from

0.9V to 5.5V. The ISL6225 combines two synchronous PWM
voltage regulators into a single IC. PWM1 and PWM2 output
voltages are set by a simple feedback voltage divider
connected across the outputs to GND. The feedback voltage
divider outputs are 0.9VDC, which are connected to the
VSEN1 and VSEN2 pins.

Automatic mode selection of constant-frequency synchronous
rectification at heavy load, and hysteretic diode-emulation at
light load, assure high efficiency over a wide range of
conditions. The hysteretic mode of operation can be disabled
separately on each PWM converter if constant-frequency
continuous-conduction operation is desired for all load levels.
Efficiency is further enhanced by using the lower MOSFET
R

Voltage-feed-forward ramp modulation, current mode control,
and internal feedback compensation provide fast response to
input voltage and output load transients.

In dual power supply applications the ISL6225 monitors the
output voltage of both CH1 and CH2. An independent
PGOOD (power good) signal is asserted for each channel
after its soft-start sequence has completed, and the output
voltage is within ±10% of the set point.

as the current sense element.

DS(ON)

AN1058

Rev 0.00

May 2003

Features

• Provides regulated output voltage in the range of 0.9V–5.5V

- High efficiency over wide load range

- Synchronous buck converter with hysteretic operation at
light load

- Inhibit Hysteretic mode on one, or both channels

• No current-sense resistor required

- Uses MOSFET R

DS(ON)

- Optional current-sense resistor for precision Over­Current

• Over-Voltage, Under-Voltage and Over-Current protection
on both channels

• Under-voltage lock-out on VCC pin

• Dual input voltage mode operation

- Operates directly from battery 5V to 24V input

- Operates from 3.3V or 5V system rail

- VCC from 5V only

• Excellent dynamic response

- Combined voltage feed-forward and average current

mode control

• Power-good signal for each channel

• 300kHz switching frequency

- 180° channel to channel phase operation

Pinout

Built-in over-voltage protection prevents the output from
going above 115% of the set point by holding the lower
MOSFET on and the upper MOSFET off. When the output
voltage decays below the over-voltage threshold, normal
operation automatically resumes. Once the soft-start
sequence has completed, under-voltage protection will latch
the channel off if the output drops below 75% of its set point
value.

Adjustable over-current protection (OCP) monitors the
voltage drop across the R

of the lower MOSFET. If

DS(ON)

more precise current-sensing is required, an external current
sense resistor may be used.

Ordering Information

PART NUMBER TEMP. (oC) PACKAGE PKG. DWG. #

ISL6225CA -10 to 85 28 Ld SSOP M28.15

ISL6225CA-T -10 to 85 28 Ld SSOP Tape

AN1058 Rev 0.00 Page 1 of 11
May 2003

and Reel

M28.15

What’s Inside

This Evaluation Board Kit contains the following materials:

• ISL6225EVAL2 Evaluation Board

• ISL6225EVAL2 Board Evaluation Document

What is Needed

The following items will be needed to perform a complete
evaluation:

• 4 channel oscilloscope with probes

• 2 electronic loads

• 2 laboratory power supplies

• Precision digital multimeters

• Digital pulse generator

AN1058 Rev 0.00 Page 2 of 11

May 2003

ISL6225EVAL2

JP1 SHUNTED TOWARD VIN>5V

JP2 SHUNTED

1.

JP4 SHUNTED TOWARD FCCM2

JP6 - NO SHUNT

JP5 - NO SHUNT

JP7 SHUNTED

JP3 SHUNTED TOWARD FCCM1

FIGURE 1. INITIAL SHUNT PLACEMENT FOR ISL6225EVAL2

AN1058 Rev 0.00 Page 3 of 11

May 2003

ISL6225EVAL2

S

CONNECT THE

POSITIVE

TERMINAL (+) OF

THE 5VDC POWER

SUPPLY AND THE

POSITIVE

TERMINAL (+) OF

THE DVM TO J4

VCC

CONNECT THE

NEGATIVE TERMINAL

(-) OF THE 5VDC
POWER SUPPLY AND
NEGATIVE TERMINAL

(-) OF THE DVM TO

THE GND TERMINAL

J14

CONNECT THE

POSITIVE TERMINAL

(+) OF THE

ADJUSTABLE 24VDC

POWER SUPPLY TO

THE VIN TERMINALS

J2 AND J3

CONNECT THE

NEGATIVE TERMINAL

(-) OF THE 24VDC

POWER SUPPLY AND

THE NEGATIVE

TERMINAL (-) OF THE

DVM TO THE GND

TERMINAL J1

FIGURE 2. WIRING CONNECTIONS FOR ISL6225EVAL2

CONNECT THE

POSITIVE TERMINAL

(+) OF THE DVM TO

ONE OF THE VIN

TERMINALS J2 OR

J3

CONNECT THE

NEGATIVE

TERMINAL (-) OF

THE ELECTRONIC

LOAD AND THE DVM

TO THE GND

TERMINAL J8

CONNECT THE

POSITIVE TERMINAL

(+) OF THE

ELECTRONIC LOAD

AND THE DVM TO

THE VOUT1

TERMINAL J5

CONNECT THE

POSITIVE TERMINAL

(+) OF THE

ELECTRONIC LOAD

AND THE DVM TO

THE VOUT2

TERMINAL J6

CONNECT THE

NEGATIVE

TERMINAL (-) OF

THE ELECTRONIC

LOAD AND THE DVM

TO THE GND

TERMINAL J7

CR1 — CHANNEL 1

POWER GOOD

INDICATOR LED

CR2 — CHANNEL 2

POWER GOOD

INDICATOR LED

OSCILLOSCOPE TIP MEASUREMENT POINT FOR VOUT1

OSCILLOSCOPE TIP

MEASUREMENT

POINT FOR PHASE2

OSCILLOSCOPE TIP

MEASUREMENT

POINT FOR PHASE1

OSCILLOSCOPE TIP MEASUREMENT POINT FOR VOUT2

ISL6225EVAL2

TABLE 1. DETAILED DESCRIPTION OF THE JUMPER

SETTINGS

JUMPER POSITION FUNCTION

*VIN>5V *Input Voltage greater than 5V

JP1

VIN=5V Input Voltage 3.3V to 5V operation

*Shunted *An AmpMeter may be connected across

JP2

*FCCM1 *PWM1 Fixed Continuous Conduction

JP3

Away from
FCCM1

*FCCM2 *PWM2 Fixed Continuous Conduction

JP4

Away from
FCCM2

Shunted CH1 enabled

JP5

* Removed * CH1 disabled

Shunted CH2 enabled

JP6

*Removed * CH2 disabled

*Shunted * One VIN supply for both CH1 and CH2

JP7

Removed Separate VIN supplies for CH1 and CH2

NOTE: * = Initial Setting

.

TABLE 2. LED CONDITION INDICATORS

LED CONDITION CONDITION RESULT

CR1

CR2

these pins to measure IC and GATE Drive
Current only

Mode

PWM1 Hysteretic Operation
enabled

Mode

PWM2 Hysteretic Operation enabled

Green VOUT1 Within PGOOD

Range

Red VOUT1 Outside PGOOD

Range

Green VOUT2 Within PGOOD

Range

Red VOUT1 Outside PGOOD

Range

Quick Setup

• The VIN Power Supply must always be the first supply on
and the last supply off.

•The 5V V

• Make sure the power is off before moving any jumpers,
except EN1 and EN2.

Step 1: Set the output voltage of the 5V adjustable power

supply to zero volts. Connect the positive terminal (+)
of the power supply to the VCC terminal J4. Connect
the negative terminal (-) of the 5VDC power supply to
the GND terminal J14.

Do not apply power yet

Power Supply must be between 5V ± 5%.

CC

Step 2: Connect the positive terminal (+) of a DVM to the

VCC terminal J4. Connect the negative terminal (-) of
the DVM to the GND terminal J14.

Step 3: Set the adjustable 24VDC output voltage to zero

volts. Connect the positive terminal (+) of the power
supply to the VIN terminals J2 and J3. Connect the
negative terminal (-) of the 24VDC power supply to
the GND terminal J1.

Do not apply power yet

Step 4: Connect the positive terminal (+) of a DVM to one of

the VIN terminals J2 or J3. Connect the negative
terminal (-) of the DVM to the GND terminal J1.

Step 5: Connect the positive terminal (+) of the electronic

load and the DVM to the VOUT1 terminal J5.
Connect the negative terminal (-) of the electronic
load and the DVM to the GND terminal J8.

Step 6: Connect the positive terminal (+) of the electronic

load and the DVM to the VOUT2 terminal J6.
Connect the negative terminal (-) of the electronic
load and the DVM to the GND terminal J7.

Step 7: Take the adjustable 24VDC power supply that is

connected to the VIN terminals J2 and J3 and make
sure the output voltage is set to zero VOLTS.

Step 8: Turn on the 24VDC power supply.
Step 9: While reading the DVM, increase the output voltage

of the 24VDC power supply to 5.0 VDC.

Step 10: Turn on the 5VDC power supply.
Step 11: While reading the DVM, increase the output voltage

of the 5VDC power supply to 5VDC.

Step 12: Install the EN1 shunt jumper JP5.
Step 13: Install the EN2 shunt jumper JP6.

NOTE: Terminals J1 (EN1) and J12 (EN2) may be connected to a
Pulse generator for controlled on/off operation and may be observed
with an oscilloscope.

Step 14: Read the DVM connected to the VOUT1

terminal J5.

Step 15: Read the DVM connected to the VOUT2

terminal J6.

The 24V VIN Power Supply may be adjusted between 5-24
VDC.

If Hysteretic operation is desired move jumper J3 for PWM1 or
JP4 for PWM2, to the position opposite the silk screen
“FCCM”.

The Electronic Load can be connected to VOUT1 and VOUT2
for load regulator measurement.

Make sure the power is off before moving the jumpers.

Terminals J1 (EN1) and J12 (EN2) may be connected to a
Pulse generator for controlled on/off operation and may be
observed with an oscilloscope.

Make sure the enable voltage is less than 5V V

CC

.

AN1058 Rev 0.00 Page 4 of 11
May 2003

AN1058 Rev 0.00 Page 5 of 11

May 2003

ISL6225EVAL2

5

5

4

4

3

3

221

1

D

DCCBBAA

VOUT2

PG1

VOUT1

VOUT1

VOUT2

PG1

VCC'

VIN'

VIN'

VOUT1

PG2

PG2VOUT

2

VCC

VCC

VCC

VCC'

VCC

TitleSizeDocument NumberRevDate:SheetofISL6225EVAL2_DUALSWITCHERA

ISL6225 EVALUATION BOARD (DUAL SWITCHER

)

INTERSI

L

Building 2A,Suite 1054020 Stirrup Creek DriveB11Phone: [phone]Durham, NC 27703Fax: [phone]

1

VIN2GNDGN

D

VCC

2.50V

GND

GND

EN2EN1PGOOD1EN1EN

2

FCCM1

GND

2.50V

VIN=5VPGOOD21.80VFCCM

2

VIN1

VIN1=VIN2VIN>5V

CURR-MEAS

1.80V

+

C13
NI

R2

0

J12

JP1

123

JP2

C23

4.7u

10V

JP6

C61.0u10VR17680

R7
NI

C1110n50V

J5

+

C15NIR16680

J

6

C10
10n

50V

JP4

123

+

C12
NI

+

C20220u4V

L1

10.0u

Sumida CDRH12 4-100MC

C90.15u25

V

Q1

BSS123LT1

J13

R21

10.0K

+

C22
220u

4V

U2

FDS6912A

1
2

3
45

6

7

8

C2
10u

25V
X5R

JP7

+

C4
68u

16V

R15

680

+

C14NI

REDGREE

N

CR2LXA3025IGC-T

R

TP1

JP5

C214.7u10

V

J10

R30

R8

17.8K

R19
680

TP4

PHASE 1

J4

R11100kR1310.0K

J2

C5

4.7u

10V

J1

J

3

J8

JP3

1

2

3

J9

R1100kD2BAT54WT

1

1

3

D1
BAT54WT1

13

J14

+

C1
NI

Q2BSS123LT1

J11

C1910n50V

R20

10.0K

U3FDS6912A1234567

8

R12

10.0k

C17
NI

C8

0.15u

25V

R910.0K

R14
680

R4

2.00K

U1

ISL6225

GND

1

LGATE1

2

PGND1

3

PHASE1

4

UGATE1

5

BOOT1

6

ISEN1

7

EN1

8

VOUT1

9

VSEN1

10

OCSET1

11

SOFT1

12

DDR

13

VIN

14

PG1

15

PG2/REF

16

SOFT2

17

OCSET2

18

VSEN2

19

VOUT2

20

EN2

21

ISEN2

22

BOOT2

23

UGATE2

24

PHASE2

25

PGND2

26

LGATE2

27

VCC

28

TP3PHASE

2

R10
100k

REDGREEN

CR1

LXA3025IGC-TR

R18

680

C18
10n

50V

J

7

TP2

C7

1.0u

10V

C310u25VX5RL210.0uSumida CDRH124-100MCR6NIR52.00KC16N

I

FIGURE 3. ISL6225EVAL2 SCHEMATIC

ISL6225EVAL2

TABLE 3. BILL OF MATERIALS (BOM)

QTY REFERENCE DESCRIPTION VENDOR PART NO.

4 C10, C11, C18, C19

2 C2, C3

2 C20, C22

1C4

3 C5, C21, C23

2 C6, C7

2 C8, C9

2 CR1, CR2 Led, SMD, 4P, Polarized, Red/Grn Lumex SSL-LXA3025IGC

2 D1, D2 Diode, Schottky, SMD, SOT323, 3P, 30V, 0.2A ON-Semiconductor BAT54WT1-T

14 J1-J14 Terminal Post, TH, 0.09 Keystone 1502-2

3 JP1, JP3, JP4 Header, 1x3, Breakaway, 1X36, 2.54mm, ST Berg/FCI 68000-236-1X3

7 JP1-JP7 Jumper, 2PIN, Shunt Sullens SPC02SYAN

4 JP2, JP5-JP7 Header, 1x2, Retentive, 2.54mm, ST Berg/FCI 69190-202

2 L1, L2

2 Q1, Q2 MOSFET, N-Channel, 3P, SOT23, 100V, 0.17A ON-Semiconductor BSS123LT1-T

3 R1, R10, R11 Resistor, SMD, 0805, 100K, 1/10W, 1%, TF Panasonic ERJ-6ENF1003V

6 R14-R19

2 R2, R3

2 R4, R5 Resistor, SMD, 0805, 2K, 1/10W, 1%, TF Panasonic ERJ-6ENF2001V

1 R8 Resistor, SMD, 0805, 17.8K, 1/10W, 1%, TF Panasonic ERJ-6ENF1782V

5 R9, R12, R13, R20, R21 Resistor, SMD, 0805, 10K, 1/10W, 1%, TF Panasonic ERJ-6ENF1002V

4 TP1-TP4 Test Point, Scope Probe, 0.135" DIA Tektronix 131-5031-00

1 U1 IC, Dual Switcher, 24V, 28Pin, SSOP Intersil ISL6225CA

2 U2, U3 MOSFET, Dual, N-Channel, Logic, 8P, SOIC, 30V, 6A Fairchild FDS6912A

Capacitor, SMD, 0805, .01F,50V, 10%,X7R

Capacitor, SMD,1812, 10F, 25V,20%, X5R

Pos Cap, Low ESR, SMD, D3, 220F, 4V, 20%

Capacitor, TANT, Low ESR, SMD, D, 68F, 16V, 10%

Capacitor, SMD,1206, 4.7F, 10V, 10%, X7R

Capacitor, SMD, 1206, 1F, 10V, 10%, X7R

Capacitor, SMD, 0805, 0.15F, 25V, 10%, X7R

Inductor, SMD, 5.7mm, 4.6H

Resistor, SMD, 0805, 680, 1/10W, 5%, TF

Resistor, SMD, 0805, 0, 1/10W, TF

Kemet C0805C103K5RAC

Taiyo Yuden TMK432BJ106MM-T

Sanyo 4TPB220M

Kemet T494D686K016AS

Venkel C1206X7R100475KNE

Kemet C1206C105K8RAC

Panasonic ECJ-2YB1E154K

Panasonic ETQ-P6F4R6HFA

Panasonic ERJ-6GEYJ681V

Panasonic ERJ-6GEY0R00V

AN1058 Rev 0.00 Page 6 of 11
May 2003

ISL6225EVAL2

AN1058 Rev 0.00 Page 7 of 11
May 2003

ISL6225EVAL2

AN1058 Rev 0.00 Page 8 of 11
May 2003

ISL6225EVAL2

AN1058 Rev 0.00 Page 9 of 11
May 2003

ISL6225EVAL2

AN1058 Rev 0.00 Page 10 of 11
May 2003

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Refer to "http://www.renesas.com/" for the latest and detailed information.

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