Renesas ISL6225EVAL2 Manuale utente

USER’S MANUAL

AN1058

Rev 0.00

May 2003

ISL6225EVAL2

Dual Switcher Evaluation Board Setup Procedure

AN1058 Rev 0.00 Page 1 of 11

May 2003

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

RDS(ON) as the current sense element.

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.

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 RDS(ON) of the lower MOSFET. If

more precise current-sensing is required, an external current

sense resistor may be used.

Ordering Information

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 RDS(ON)

- Optional current-sense resistor for precision Over-

Current

• 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

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

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

and Reel

M28.15

EN1

GND

DDR

VSEN1

VIN PG1

VCC

VOUT1 9

ISEN1

LGATE1

PGND1

BOOT1

UGATE1

PHASE1

ISEN2

LGATE2

PGND2

BOOT2

UGATE2

PHASE2

EN2

VSEN2

VOUT2

OCSET2OCSET1

SOFT1 SOFT2

PG2/REF

ISL6225

SSOP-28

AN1058 Rev 0.00 Page 2 of 11

May 2003

ISL6225EVAL2

JP1 SHUNTED TOWARD VIN>5V

JP2 SHUNTED

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

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

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

AN1058 Rev 0.00 Page 4 of 11

May 2003

ISL6225EVAL2

NOTE: * = Initial Setting

Quick Setup

• The VIN Power Supply must always be the first supply on

and the last supply off.

•The 5V V

CC Power Supply must be between 5V ± 5%.

• 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

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 VCC.

TABLE 1. DETAILED DESCRIPTION OF THE JUMPER

SETTINGS

JUMPER POSITION FUNCTION

JP1

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

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

JP2

*Shunted *An AmpMeter may be connected across

these pins to measure IC and GATE Drive

Current only

JP3

*FCCM1 *PWM1 Fixed Continuous Conduction

Mode

Away from

FCCM1

PWM1 Hysteretic Operation

enabled

JP4

*FCCM2 *PWM2 Fixed Continuous Conduction

Mode

Away from

FCCM2

PWM2 Hysteretic Operation enabled

JP5

Shunted CH1 enabled

* Removed * CH1 disabled

JP6

Shunted CH2 enabled

*Removed * CH2 disabled

JP7

*Shunted * One VIN supply for both CH1 and CH2

Removed Separate VIN supplies for CH1 and CH2

TABLE 2. LED CONDITION INDICATORS

LED CONDITION CONDITION RESULT

CR1

Green VOUT1 Within PGOOD

Range

Red VOUT1 Outside PGOOD

Range

CR2

Green VOUT2 Within PGOOD

Range

Red VOUT1 Outside PGOOD

Range

AN1058 Rev 0.00 Page 5 of 11

May 2003

ISL6225EVAL2

PG1

VOUT1

PG1

VCC'

VIN'

VOUT1

PG2

VCC

VCC'

(

)

(

)

(

)

VCC

2.50V

GND

FCCM1

GND

2.50V

VIN1

CURR-MEAS

C13

JP1

JP2

C23

4.7u

10V

JP6

C10

10n

50V

C12

10.0u

Sumida CDRH12 4-100MC

BSS123LT1

R21

10.0K

C22

220u

FDS6912A

10u

25V

X5R

68u

16V

R15

680

JP5

J10

17.8K

R19

680

TP4

PHASE 1

4.7u

10V

JP3

BAT54WT1

J11

R20

10.0K

R12

10.0k

C17

0.15u

25V

R14

680

2.00K

ISL6225

GND

LGATE1

PGND1

PHASE1

UGATE1

BOOT1

ISEN1

EN1

VOUT1

VSEN1

OCSET1

SOFT1

DDR

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

R10

100k

REDGREEN

CR1

LXA3025IGC-TR

R18

680

C18

10n

50V

TP2

1.0u

10V

FIGURE 3. ISL6225EVAL2 SCHEMATIC

AN1058 Rev 0.00 Page 6 of 11

May 2003

ISL6225EVAL2

TABLE 3. BILL OF MATERIALS (BOM)

QTY REFERENCE DESCRIPTION VENDOR PART NO.

4 C10, C11, C18, C19 Capacitor, SMD, 0805, .01F,50V, 10%,X7R Kemet C0805C103K5RAC

2 C2, C3 Capacitor, SMD,1812, 10F, 25V,20%, X5R Taiyo Yuden TMK432BJ106MM-T

2 C20, C22 Pos Cap, Low ESR, SMD, D3, 220F, 4V, 20% Sanyo 4TPB220M

1C4 Capacitor, TANT, Low ESR, SMD, D, 68F, 16V, 10% Kemet T494D686K016AS

3 C5, C21, C23 Capacitor, SMD,1206, 4.7F, 10V, 10%, X7R Venkel C1206X7R100475KNE

2 C6, C7 Capacitor, SMD, 1206, 1F, 10V, 10%, X7R Kemet C1206C105K8RAC

2 C8, C9 Capacitor, SMD, 0805, 0.15F, 25V, 10%, X7R Panasonic ECJ-2YB1E154K

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 Inductor, SMD, 5.7mm, 4.6HPanasonic ETQ-P6F4R6HFA

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 Resistor, SMD, 0805, 680, 1/10W, 5%, TF Panasonic ERJ-6GEYJ681V

2 R2, R3 Resistor, SMD, 0805, 0, 1/10W, TF Panasonic ERJ-6GEY0R00V

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

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

ISL6225EVAL2

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