ISL6558EVAL1 Intersil, ISL6558EVAL1 Datasheet

ISL6558EVAL1

Manufacturer Part Number

ISL6558EVAL1

Description

EVAL BOARD W/LOAD TESTER ISL6

Manufacturer

Intersil

Series

Endura™r

Datasheets

1.ISL6558IRZ.pdf (16 pages)

2.ISL6558EVAL1.pdf (24 pages)

Specifications of ISL6558EVAL1

Main Purpose

DC/DC, Step Down

Outputs And Type

1, Non-Isolated

Power - Output

150W

Voltage - Output

1.5V

Current - Output

100A

Voltage - Input

5V, 12V

Regulator Topology

Buck

Frequency - Switching

500kHz

Board Type

Fully Populated

Utilized Ic / Part

HIP6601, ISL6558

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 24
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ISL6558EVAL1Z - Multi-Phase Power Conversion

For Routers and PC Peripherals Up To 100A

Abstract

This application note highlights design considerations for

a 150W power supply using Intersil’s ISL6558 4-Phase

Controller and ISL6612A Synchronous-Rectified Driver. A

step-by-step design procedure for a 12V-to-1.5V@100A

with 83% efficiency converter based on these two chips

is described; all formulae are applicable for a multi-phase

interleaved DC-DC buck converter. Thereafter,

experimental results with discussion give users a deeper

understanding of the performance of the reference

design and the advantages of the ISL6558 and

ISL6612A. Some operation and modification tips of the

evaluation board are included.

Introduction

The changing computer performance landscape has

brought about the need for flexible power solutions.

Peripheral performance continues to increase as higher

speed bus interfaces are made available. Router designs

continue to grow in complexity as on-board processors

must perform more functions while continuing to

increase the speed of data transfer. This translates to

higher demands on the DC-DC converters which supply

them.

Intersil’s Endura

ISL65xx) and synchronous-rectified buck MOSFET

drivers (ISL66xx) are suitable for the multi-channel

interleaved DC-DC buck converter implementation, as

shown in Figure 1, and provide superior performance

solutions to meet the above market demands.

July 31, 2009

AN1029.3

FIGURE 1. MULTI-PHASE INTERLEAVED BUCK

Vin

Lin

Cin

CONVERTER

™

multi-phase controllers (HIP63xx and

Endura™ is a trademark of Intersil Americas Inc. Tri-State® is a registered trademark of National Semiconductor Corp.

1-888-INTERSIL or 1-888-468-3774

Application Note 1029

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

This application note first gives a brief introduction of

Intersil’s four-phase controller ISL6558 and

synchronous-rectified driver ISL6612A. A step-by-step

design procedure for a 12V-to-1.5V@100A, 500kHz, and

83% efficiency converter using the interleaved approach

follows. It includes all the fundamental formulae to

design a multi-phase interleaved DC-DC buck converter.

Thereafter, experimental results with discussion give

users a deeper understanding of the performance of the

reference design and the advantages of both ICs. Term

Definition, Reference, Schematics, and Layout are

included at the end of this application note.

Intersil’s ISL6558 and

ISL6612A

The ISL6558 controller coupled with some ISL6612A

single-channel driver ICs form the basic building blocks

for applications which demand high current and rapid

load transient speed.

The ISL6558 regulates the output voltage and balances

load currents for two to four synchronous-rectified buck

converter channels; its internal structure is shown in

Figure 2. The internal 0.8V reference allows output

voltage selection down to that level with a 1% system

accuracy over-temperature. The current-channel balance

loop provides a better thermal balance among all phases.

Output voltage droop, or active voltage positioning, is

optional. Overvoltage and overcurrent monitors and

protection functions of the IC provide a safe environment

for microprocessor or other load. The controller is

available in a 16 Lead SOIC package and a space

economical 5mmx5mm

detailed descriptions of the ISL6558 functionality, refer to

the device datasheet [1]

The ISL6612A is a driver IC capable of delivering up to

2A of gate-charge current for rapidly switching both

MOSFETs in a synchronous-rectified bridge. The

ISL6612A accepts a single logic input to control both

upper and lower MOSFETs. Its Tri-State® feature,

working together with Intersil’s Multi-Phase PWM

controllers, helps prevent a negative transient on the

output voltage when the output is being shut down. This

eliminates the Schottky diode that is used in some

systems for protecting the microprocessor from

reversed-output-voltage damage. Furthermore, adaptive

shoot-through protection is provided on both switching

edges to provide optimal dead time and minimize

conduction losses. Bootstrap circuitry permits greater

enhancement of the upper MOSFET. For a more detailed

description of the ISL6612A, refer to the device data

sheet [2]. In addition, the ISL6614A/ISL6610

dual-channel driver IC provides equivalent functionality

with some space savings [3].

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

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Author: Chun Cheung, Ross O. Staffhorst

20 Lead QFN package. For more

Related parts for ISL6558EVAL1

ISL6558EVAL1 Summary of contents

Page 1

... ISL6558EVAL1Z - Multi-Phase Power Conversion For Routers and PC Peripherals Up To 100A Abstract This application note highlights design considerations for a 150W power supply using Intersil’s ISL6558 4-Phase Controller and ISL6612A Synchronous-Rectified Driver. A step-by-step design procedure for a 12V-to-1.5V@100A with 83% efficiency converter based on these two chips is described ...

Page 2

Application Note 1029 - VSEN 0 X1.15 SOFT- START AND FAULT LOGIC COMP 0.8V REFERENCE FB DROOP I TOTAL OC GND FIGURE 2. ISL6558 INTERNAL STRUCTURE 2 VCC PGOOD POWER-ON RESET (POR ...

Page 3

D CH1 PWM CH2 PWM CH3 PWM CH4 PWM I LO,1 I LO,2 I LO CH1, UPPER AND LOWER FETS I Q1 CURRENT I Lo,PP CH2, UPPER AND LOWER FETS CURRENT CH3, UPPER AND LOWER FETS ...

Page 4

... MOSFETs. Paralleling MOSFETs in each leg is another way to push per-phase currents even higher, but the power and thermal stresses on each driver should be evaluated carefully. In such a case driver such as Intersil’s ISL6609 could be considered. See “DRIVER LOSSES CALCULATION” on page 8. In the reference design, all four phases of the ISL6558 are used to deliver 100A of total output current ...

Page 5

Equation 2 represents an individual channel’s peak-to-peak inductor current. Equation 3 represents the combined ripple current filtered by the output capacitors. • – ------------------------------ - , = Lo PP • Fsw ...

Page 6

The ESL of a capacitor is not usually listed in databooks. It can be practically approximated with Equation 11 • ------- - ----------------------------------- - ESL = ( • 2π F RES where F is the ...

Page 7

N=1 0.45 0.40 0.35 0.30 2 0.25 0.20 3 0.15 4 0.10 0.05 0.00 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 DUTY CYCLE (D) FIGURE 7. INPUT-CAPACITOR RMS CURRENT MUTIPLIER 0. 0.25 0.20 0.15 0.10 ...

Page 8

I • • Io ⎜ PP ⎟ Fsw ( ) ---- - -------- - + LOW ⎝ ⎠ Thus, the total power dissipated in each lower MOSFET is approximated ...

Page 9

G= 0.75V /V IN RAMP_PP + + - - SUMMARY OF DESIGN Table 1 shows the calculation results of critical design parameters for the reference design, a four-channel interleaved DC-DC buck converter. Table 2 summarizes an approximate power dissipation analysis ...

Page 10

... Cin FIGURE 11. INPUT FILTER LAYOUT CONFIGURATION Experimental Results The ISL6558EVAL1Z evaluation board is capable of 100A continuous load current and handling 100A/µs or higher speed load transients. The evaluation board meets the design specifications indicated in Table 3. TABLE 3. ISL6558EVAL1Z PRELIMINARY ...

Page 11

Lo = 400nH Iout (A) FIGURE 12. EFFICIENCY OUTPUT SOFT-START AND TURN-OFF With the input voltage (VCC12) staying within operational limits, when the control ...

Page 12

Transient Response with Lo = 400nH (4 Turns) Note that the measurement is taken without having the C300 (1000µF) input capacitor on the board. The transient response with 400nH output inductance is shown in Figures 15 to 18. V ...

Page 13

Transient Response with Lo = 650nH (5 Turns) Note that the measurement is taken without having the C300 (1000µF) input capacitor on the board. The transient response with 650nH output inductance is shown in Figures 19 to 24. V ...

Page 14

Transient Response with Lo = 650nH and Added C300 (1000µF) As shown in Figure 19, the input current is seen high as 26A, which could cause the input source to overcurrent trip. Adding an 1000µF input ...

Page 15

... FIGURE 27. OVERVOLTAGE WAVEFORMS Conclusion The superior performance of Intersil’s ISL6558 4-phase controller, coupled with Intersil’s ISL6612A driver, has been demonstrated in the reference design of a 150W interleaved DC-DC buck converter. An efficiency of 83% at 1.527V output and 100A full load has been achieved. ...

Page 16

... Intersil’s ISL6558 Data Sheet, File No. FN9027. [2] Intersil’s ISL6612A, ISL6613A Data Sheet, File No. FN9159. [3] Intersil’s HIP6602A Data Sheet, File No. FN4902. [4] Intersil’s ISL6557A Data Sheet, File No. FN9058. [5] “PCB Design Guidelines For Reduced EMI.” Texas Instrument: SZZA009, November 1999. ...

Page 17

VCC5 J6 R28 1kΩ R26 10kΩ RED PGOOD TP12 C12 U8 0.1µF PGOOD COMP VCC TP11 COMP JP1 DROOP FB C13 22nF VSEN C17 spare FS/EN GND R6 6.04kΩ R5 226kΩ R10 1.10kΩ R11 R9 1.05kΩ 1.10kΩ R12 1.05kΩ 17 ...

Page 18

VCC12 46.4kΩ FIGURE 29. LOAD TRANSIENT GENERATOR CIRCUIT Bill of Materials QTY REFERENCE 1 CR1 5 C1, C8, C11, C12, C16 4 C2, C3, C4 C6, C9, C14, C18, C57, C59, C61, C64-71, C74-76, C80, C82, C84, C92, ...

Page 19

... Various 0603 Various 2512 Vishay WSL2512R050FB43 2512 Vishay WSL2512R020FB43 2512 0603 Various 0805 Various SMT C&K Components Tektronix Jolo Keystone Intersil Intersil Intersil PART NO. 68000-236 71363-102 68000-236 71363-102 KPA8CTP 111-0702-001 111-0703-001 HUF76143S3S HUF76145S3S HUF76129D3S 2N7002 GT11MSKE 1314353-00 SPCJ-123-01 1514-2 ISL6612A ISL6558CB HIP2100IB AN1029 ...

Page 20

Application Note 1029 FIGURE 30. TOP SILKSCREEN 20 AN1029.3 July 31, 2009 ...

Page 21

Application Note 1029 FIGURE 31. LAYER 1 TOP COPPER 21 AN1029.3 July 31, 2009 ...

Page 22

Application Note 1029 FIGURE 32. LAYER 2 GROUND PLANE 22 AN1029.3 July 31, 2009 ...

Page 23

Application Note 1029 FIGURE 33. LAYER 3 POWER PLANE 23 AN1029.3 July 31, 2009 ...

Page 24

... 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 24 Application Note 1029 FIGURE 34 ...

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