Renesas ISL8106EVAL1Z User Manual

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Page 1

USER’S MANUAL

FSET

60 F

OSC

12–

10

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

(EQ. 1)

SEN

P-P

----------

+ OC

 r

DS ON



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

(EQ. 2)

ISL8106EVAL1Z

Evaluation Board

The ISL8106EVAL1Z evaluation board demonstrates the performances of the ISL8106, synchronous buck PWM controller with Intersil’s Robust Ripple Regulator (R3) technology.

The ISL8106 features a 1.5ms digital soft-start and can be started into a pre-biased output voltage. The PWM switching frequency can be programmed from 200kHz to 600kHz. The ISL8106 can be configured to operate in Forced-Continuous-Conduction-Mode (FCCM) or in Diode-Emulation-Mode (DEM), which improves light-load efficiency. An audio filter prevents the PWM switching frequency from entering the audible spectrum due to extremely light load while in DEM. Refer to the ISL8106 data sheet for a more detailed operation by clicking on the following link.

http://www.intersil.com/data/fn/fn9283.pdf

ISL8106EVAL1Z Reference Design

The ISL8106EVAL1Z design criteria is listed in Table 1.

TABLE 1. ISL8106EVAL1Z DESIGN CRITERIA

PARAMETERS VALUE

Input Voltage 7V to 25V

Output Voltage 1.8V

Rated Output Current 25A

Switching Frequency 300kHz

Setting Switching Frequency

The switching frequency of ISL8106EVAL1Z can be adjusted through the resistor, R to the GND pin. Programming the approximate PWM switching frequency can be estimated from Equation 1:

, that is connected from the FSET pin

AN1452

Rev 0.00

Feb 16, 2009

Where:

-R

() is the resistor used to program the

SEN

overcurrent setpoint

-I

is the I

threshold current value sourced from the

SEN

ISEN pin that will activate the OCP circuit

is the maximum continuous DC load current

-I

is the inductor peak-to-peak ripple current

P-P

-OC

is the desired overcurrent setpoint expressed as

a multiplier relative to I

Power and Load Connections

INPUT VOLTAGE

The PVIN post (J1) is connected to the drain of the upper MOSFET and the VIN pin of the IC. The post (J2) is connected to PGND.

OUTPUT VOLTAGE LOADING AND MONITORING

Connect the positive and negative leads of an electronic load to J3 and J4 respectively. Terminal TP4 (PGND) and TP5 (V

) can be used to measure the output voltage.

OUT

Switch Descriptions

TABLE 2. ISL8106EVAL1Z SWITCH DESCRIPTIONS

TOGGLE SWITCHES FUNCTION

SW1 OFF: Shorts the EN pin to GND (Disable

SW2 DEM: FCCM pin is pulled to GND to

the controller)

ON: Enable the controller, EN pin is pulled

to V

and clamped by D1.

enable diode-emulation mode

FCCM: FCCM pin is pulled to VCC to

inhibits diode-emulation mode

Test-point Descriptions

Setting Overcurrent Protection Th re sho ld

An overcurrent protection fault will occur when the ISEN pin has measured more than the OCP threshold current I (26µA, typ.), on consecutive PWM pulses, for a period exceeding 20µs. It does not matter how many PWM pulses are measured during the 20µs period. If a measurement falls below I to zero. A short circuit protection fault will occur when the ISEN pin has measured more than the short-circuit threshold current I

The value of RSEN can then be calculated by Equation 2:

AN1452 Rev 0.00 Page 1 of 9 Feb 16, 2009

before 20µs has elapsed, then the timer is reset

in less than 10µs, on consecutive PWM pulses.

SC,

TABLE 3. ISL8106EVAL1Z TEST POINT DESCRIPTIONS

TEST POINTS SIGNALS

TP1 VCC

TP2 PGND

TP3 PGOOD

TP4 PGND

TP5 VOUT

TP6 PVIN

TP6 LX

Page 2

ISL8106EVAL1Z

100

0.1 1 10 100 OUTPUT CURRENT (A)

EFFICIENCY (%)

DEM

FCCM

OUT

PGOOD

OUT

PGOOD

OUT

Typical Performance Curves

FIGURE 1. EFFICIENCY (VIN = 12V, V

OUT

= 1.8V, F

FIGURE 3. PRE-BIASED START-UP (1V PRE-BIASED)

= 300kHz)

FIGURE 2. SOFT-START: 25A LOAD, FCCM = HIGH

FIGURE 4. STEADY STATE: 25A LOAD

AN1452 Rev 0.00 Page 2 of 9 Feb 16, 2009

FIGURE 5. STEADY STATE: NO LOAD (FCCM)

FIGURE 6. STEADY STATE: NO LOAD (DEM)

Page 3

ISL8106EVAL1Z

OUT

Typical Performance Curves (Continued)

FIGURE 7. STEADY STATE: 1A LOAD (FCCM)

FIGURE 8. STEADY STATE: 1A LOAD (DEM)

FIGURE 9. LOAD TRANSIENT: 25A TO 0A (CCM) FIGURE 10. LOAD TRANSIENT: 0A TO 25A (CCM)

FIGURE 11. LOAD TRANSIENT: 25A TO 0A (DCM-CCM)

FIGURE 12. LOAD TRANSIENT: 0A TO 25A (CCM-DCM)

AN1452 Rev 0.00 Page 3 of 9 Feb 16, 2009

Page 4

Feb 16, 2009

TGATE

BGATE

VOUT

VIN

PVCC

PGND

LXFB

VREG

VCC

FSETFSET

FCCM

COMP

BSOC

PVIN

PGOOD

BOOT

VIN

VCC

TitleSize Rev

Date: Sheet

ISL8106 Application Schematic

11Thursday, November 13, 2008

1001 Murphy Ranch Rd.

Milpitas, CA, 95035

Intersil Corporation

TitleSize Rev

Date: Sheet

ISL8106 Application Schematic

11Thursday, November 13, 2008

1001 Murphy Ranch Rd.

Milpitas, CA, 95035

Intersil Corporation

TitleSize Rev

Date: Sheet

ISL8106 Application Schematic

11Thursday, November 13, 2008

1001 Murphy Ranch Rd.

Milpitas, CA, 95035

Intersil Corporation

C29 330uF

Q4Q4

C28 330uF

C25 DNP

C23 DNP

C27 330uF

BSS123LT1

TP2TP2

R16

4.7

R16

4.7

C7 1nFC71nF

1 2

R130R13

J1J1

C26 DNP

1nFC41nF

1.69kR91.69k

TP1TP1

C9 10nFC910nF

C19

0.1uF

C19

0.1uF

1 2

TP3TP3

GNDP1GND

C10

0.22uF

C10

0.22uF

1 2

C20

0.1uF

C20

0.1uF

1 2

4.7uFC64.7uF

1000pFC81000pF

SW2SW2

R21 DNP

54.9kR554.9k

C11

4.7uF

C11

4.7uF

R200R20

R41KR4 1K

C30

330uF

C30 330uF

RED

GREEN

5365F

RED

GREEN

5365F

R10

4.7k

R10

4.7k

C24 DNP

R17

5.9k

R17

5.9k

R190R19

R18

2.2

R18

2.2

68pFC268pF

0.68uHL10.68uH

1 2

J3 OUTJ3OUT

C22

0.1uF

C22

0.1uF

1 2

Q2Q2

SW1SW1

Q3Q3

R30R3

C17

DNP

C17

DNP

ISL8106U1ISL8106

VIN

VCC

COMP

TGATE

BSOC

PGND

BGATE

PGOOD

FCCM

FB6FSET

BOOT

PVCC

TP5TP5

10nFC110nF

C5 10nFC510nF

R22

DNP

R22

DNP

R11

4.7k

R11

4.7k

C12

0.1uF

C12

0.1uF

J2J2

C13

3.3uF

C13

3.3uF

J5J5

1 2

R120R12

C15

560uF

C15

560uF

TP7TP7

4.7V ZenerD14.7V Zener

2 1

TP6TP6

R12KR1

15.8kR215.8k

Q1Q1

C16 560uF

R150R15 0

4.7R74.7

C14

3.3uF

C14

3.3uF

C21

0.1uF

C21

0.1uF

1 2

R61KR6 1K

TP4TP4

J4 GNDJ4GND

10.7KR810.7K

R1410R14

AN1452 Rev 0.00 Page 4 of 9

ISL8106EVAL1Z Schematic

ISL8106EVAL1Z

Page 5

ISL8106EVAL1Z

ISL8106EVAL1Z Bill of Materials

ID REFERENCE QTY PART NUMBER PART TYPE DESCRIPTION PACKAGE VENDOR

1 U1 1 ISL8106IRZ IC, Linear IC, Single PWM Controller 16Ld QFN Intersil

2 Q1, Q3 2 BSC059N04LS G MOSFET, Single N-Channel, 40V TDSON-8 Infineon

3 Q2, Q4 2 BSC018N04LS G MOSFET, Single N-Channel, 40V TDSON-8 Infineon

4 Q5 1 BSS123LT1G MOSFET N-Channel SOT-23 On Semi

5 D1 1 BST52C4V7-7-F Zener Diode 4.7V, 500mW Zener Diode SOD-123 Diode Inc.

6 D2 1 SSL-LXA3025IGC-TR LED RED/GREEN SMD LED SMD

3mmx2.5mm

7 L1 1 IHLP-5050FD-01-R68-

M01

CAPACITORS

8 C15, C16 2 EKZE350ELL561MJ25S Capacitor, Alum.

9 C13, C14 2 C3225X7R1H335M Capacitor, Ceramic,

10 C4, C7, C8 3 Capacitor, Ceramic,

11 C1, C5, C9 3 Capacitor, Ceramic,

12 C12, C19, C20, C21,

C22

13 C10 1 Capacitor, Ceramic,

14 C6, C11 2 Capacitor, Ceramic,

15 C27, C28, C29, C30 4 6TPF330M9L Capacitor, POSCAP 330µF, 20%, 6.3V, 0.009 Case D3L SANYO

16 C2 1 Capacitor, Ceramic,

17 C17, C23, C24, C25,

C26

RESISTORS

18 R1 1 Resistor, Film 2k, 1%, 1/16W SM_0603 Panasonic/Generic

19 R2 1 Resistor, Film 15.8k, 1%, 1/16W SM_0603 Panasonic/Generic

20 R4,R6 1 Resistor, Film 1k, 1%, 1/16W SM_0603 Panasonic/Generic

21 R21, R22 0 Do Not Populate SM_0603

22 R5 1 Resistor, Film 54.9k, 1%, 1/16W SM_0603 Panasonic/Generic

23 R7, R16 1 Resistor, Film 4.7, 1%, 1/16W SM_0603 Panasonic/Generic

24 R8 1 Resistor, Film 10.7k, 1%, 1/16W SM_0603 Panasonic/Generic

25 R3, R12, R13, R15,

R19, R20

26 R9 1 Resistor, Film 1.69k, 1%, 1/16W SM_0603 Panasonic/Generic

27 R10, R11 2 Resistor, Film 4.7k, 1%, 1/16W SM_0603 Panasonic/Generic

28 R14 1 Resistor, Film 10, 1%, 1/16W SM_0603 Panasonic/Generic

29 R17 1 Resistor, Film 5.9k, 1%, 1/16W SM_0603 Panasonic/Generic

30 R18 1 Resistor, Film 2.2, 1%, 1/16W SM_0603 Panasonic/Generic

5 Capacitor, Ceramic,

0 Do Not Populate

6 Resistor, Film 0, 1%, 1/16W SM_0603 Panasonic/Generic

Inductor 0.68µH Power Inductor SMD Vishay

560µF, 20%, 35V RAD 10x25 United Chemi-con

Elec.

3.3µF, 10%, 50V SM_1210 TDK/Generic

X7R

1000pF, 10%, 50V SM_0603 Generic

X7R

0.01µF, 10%, 50V SM_0603 Generic

X7R

0.1µF, 10%, 50V SM_0603 Generic

X7R

0.22µF, 10%, 25V SM_0603 Generic

X7R

4.7µF, 10%, 6.3V SM_0603 Generic

X5R

68pF, 10%, 50V SM_0603 Generic

X5R

Lumex

AN1452 Rev 0.00 Page 5 of 9 Feb 16, 2009

Page 6

ISL8106EVAL1Z

ISL8106EVAL1Z Bill of Materials (Continued)

ID REFERENCE QTY PART NUMBER PART TYPE DESCRIPTION PACKAGE VENDOR

OTHERS

31 SW1, SW2 2 GT11MSCKE Toggle Switch SMD C&K

32 P1 1 Do Not Populate

33 TP1-TP6 6 5002 TEST POINT

vertical, white

34 TP7 0 Do Not Populate

35 J1, J2 2 Blinding Post

36 J5 1 1X2 Header

37 J3, J4 2 KPA8CTP Cable Terminal BERG/FCI

PC test jack PTH Keystone

ISL8106EVAL1Z Printed Circuit Board Layers

FIGURE 13. ISL8106EVAL1Z - TOP LAYER (SILKSCREEN)

FIGURE 14. ISL8106EVAL1Z - TOP LAYER (COMPONENT SIDE)

AN1452 Rev 0.00 Page 6 of 9 Feb 16, 2009

Page 7

ISL8106EVAL1Z

ISL8106EVAL1Z Printed Circuit Board Layers (Continued)

FIGURE 15. ISL8106EVAL1Z - LAYER 2

FIGURE 16. ISL8106EVAL1Z - LAYER 3

AN1452 Rev 0.00 Page 7 of 9 Feb 16, 2009

Page 8

ISL8106EVAL1Z

ISL8106EVAL1Z Printed Circuit Board Layers (Continued)

FIGURE 17. ISL8106EVAL1Z - BOTTOM LAYER (SOLDER SIDE)

FIGURE 18. ISL8106EVAL1Z - BOTTOM LAYER (SILKSCREEN)

AN1452 Rev 0.00 Page 8 of 9 Feb 16, 2009

Page 9

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

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