Renesas ISL8112EVAL1Z User Manual

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Page 1

USER’S MANUAL

OUTVFB

1–

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(EQ. 1)

ISL8112EVAL1Z

Evaluation Board Setup Procedure

The ISL8112 is a dual-output Synchronous Buck controller with 2A integrated driver. It features high light load efficiency which is especially preferred in systems concerned with high efficiency in wide load range, like the battery powered system. ISL8112 includes two constant on-time PWM controllers. Both outputs can operate in an output fixed mode or an adjustable mode. In fixed mode, one output can be 5V or 3.3V and the other 1.5V or 1.05V. In adjustable mode, one output can range from 0.7V to 5.5V, and the other from 0V to 2.5V (sensing output voltage directly) or up to 5V (using resistor divider voltage for voltage sensing). This device also features a linear regulator providing 3.3V/5V, or adjustable from 0.7V to 4.5V via LDOREF. The linear regulator provides up to 100mA output current with automatic linear-regulator bootstrapping to the BYP input. When in switchover, the LDO output can source up to 200mA. ISL8112 includes on-board power-up sequencing, the power-good (PGOOD_) outputs, digital soft-start, and internal soft-stop output discharge that prevents negative voltages on shutdown.

ISL8112 is implemented with constant on-time PWM control scheme which need no sense resist ors an d provides 100ns response to load transients while maintaining a relatively constant switching frequency . The unique ultrasonic pulse-skipping mode maintains the switching frequency above 25kHz, eliminating undesired audible noises in low frequency operation at light load. Other features include pulse skipping which maximizes efficiency in light-load applications, and fixed-frequency PWM mode which reduces RF interference in sensitive applications.

AN1539

Rev 0.00

February 22, 2010

Recommended Equipment

• 0V to 25V power supply with at least 20A source current capability, battery, or notebook AC adapter.

• Two electronic loads capable of sinking current up to 15A.

• Dummy loads for the LDO’s.

• Digital multimeters (DMMs).

• 100MHz quad-trace oscilloscope.

• Signal generator.

Quick Start

1. Ensure that the circuit is correctly connected to the supply and loads prior to applying any power.

2. Verify that position 2’s are ON for SW1, SW2, SW3, SW4, and SW5. Make sure that no other position of each switch is ON at the same time.

3. Turn on the input power supply.

4. Verify the output voltages are co rrect.

5. Verify the LDOs output voltages are correct.

Evaluating the Other Output Voltage

The ISL8112EVAL1Z board outputs are preset to 5V/7A,

3.3V/7A and 5V/200mA on LDO. The V adjusted between 0.7V to 5.5V by changing the value of R9 and R10 or R11 and R12 given by Equation 1:

where V

•The V voltage range from 0.7V to 2.5V. Likewise, the LDO output can also track LDOREF at 1:2 with voltage range from 0.35V to 2.25V.

= 0.7V

can track OUT2REF at 1:1 ratio with input

OUT2

can also be

OUT1

FIGURE 1. TOP VIEW FIGURE 2. BOTTOM VIEW

AN1539 Rev 0.00 Page 1 of 6 February 22, 2010

Page 2

ISL8112EVAL1Z

P29

C17 1000PF

DNP

330UF2330UF

C30

R32

ISL8112

IRF7811AV

C31

OPEN

MODE

P18

R15

200K

VREF2

DNP

PVCC

R12

OPEN

0.1UF

VIN

C24

PH2

PGOOD2

PGOOD1

EN_LDO

BYP

PVCC

PGOOD1

EN1

1UF

R24

1000PF

SW3

OPEN

BYP

VOUT1

FB1

SW5

R16

R30

PH1

10UF

0.1UF

R18

R21

P30

C32

C18

R34

C12

C13

R33

P27

P26

P24

R31

R27

R23

R19

R17

R14

C29

R13

P17

P12

P11

C11

654

SW1

654

SW2

R22

R20

C27

C28

C26

432

P20

432

P23

R11

R10

C23

432

P21

432

P19

432

P22

C10

C16

C14

C15

R25

R26

OPEN

VIN

OPEN

VCC

LDO

200K

IRF7807V

200K

LDO

VCC

25.5

VCC

330UF

4.7UH

EN2

IRF7807V

1000PF

0.1UF

OPEN

1UF

VCCIN

10UF

330UF

0.1UF

200K

VOUT1

VOUT2

4.7UF

OPEN

0.1UF

200K

0.1UF

OPEN

VOUT2

BAT54S

39.2K

SW4

IRF7811AV

DNP

VOUT2

PVCC

EN2

VCC

EN_LDO

OPEN

C19

VREF2

VREF1

MODE

PGOOD2

VREF1

P15

EN1

P16

VIN

VCC

OPEN

0.1UF

LDO

P14

0.01UF

0.1UF

1UF

0.1UF

PVCC

VOUT1

BAT54S

VOUT1

P28

BYP

ILIM2

EN_LDO

FB1

GND

BOOT1

EN1

VCC

BOOT2

PVCC

PGND

LG1

PH1

UG1

ILIM1

PGOOD1

VSEN1

LDOREF

LDO

VIN

LG2

VREF1

OUT2REF

VSEN2

MODE

PGOOD2

UG2

PH2

VREF2

EN2

3.3V

ISL8112EVAL1Z Board Schematic

FIGURE 3. ISL8112EVAL1Z REV A BOARD SCHEMATIC

SW1 EN2 V

1 Connect to GND. V

NOTE: Only toggle one position at a time.

SW2 MODE OPERATING MODE

NOTE: Only toggle one position at a time.

AN1539 Rev 0.00 Page 2 of 6 February 22, 2010

2 Connect to VCC. V 3 Connect to VREF1. V

1 Connect to GND. Normal operation mode, allow automatic PWM/PFM switchover for

2 Connect to VCC. Low noise, fixed-frequency PWM mode. 3 Connect to VREF1. Ultrasonic pulse-skipping mode (20kHz min.)

TABLE 1.

output shutdown.

OUT2

TABLE 2.

output active.

OUT2

sequence to V

OUT2

pulse-skipping at light load.

OUTPUT CONTROL

OUT2

OUT1

output.

Page 3

ISL8112EVAL1Z

SW3 EN_LDO LDO CONTROL

1 Connect to GND. LDO output shutdown. 2 Connect to VCC. LDO output active. 3N/C No Connect.

NOTE: Only toggle one position at a time.

SW4 BYP OPERATING MODE

1 Connect to GND. Set BYP to 0V. No LDO switchover. 2 Connect to V 3 Connect to V

NOTE: Only toggle one position at a time.

SW5 EN1 V

1 Connect to GND. V 2 Connect to VCC. V 3 Connect to VREF1. V

NOTE: Only toggle one position at a time.

.SET BYP to V

OUT1

.SET BYP to V

OUT2

TABLE 3.

TABLE 4.

TABLE 5.

OUT1 OUT1 OUT1

OUT1

OUT2

OUT1

output shutdown. output active. sequence to V

OUT2

OUTPUT CONTROL

output.

Components List

REF DES PART NUMBER QTY MANUFACTURER DESCRIPTION

C1, C7, C8 08053D105KAT2A 3 AVX 1µF, 25V, X7R, 0805

C11 H1065-00475-10V10 1 GENERIC 4.7µF, 10V X5R 1206

C14, C16 TMK432BJ106KM 2 TAIYO-YUDEN 10µF, 25V X5R 1210

C2, C4, C5, C6, C10,

C12, C13, C23, C24, C26

C27, C28 OPEN 0 - -

C29, C30 6TPD330M 2 POSCAP SANYO 330µF, 6.3V, POS CAP 9m, D size

C3, C9, C15, C17, C18,

C19

C31, C32 OPEN 0 POSCAP -

D1, D4-D6 OPEN 0 DIODES-INC -

D2, D3 OPEN 0 ON-SEMI D7, D8 OPEN 0 DIODES -

D9 OPEN 0 ON-SEMI 0.3A, 30V, Schottky SOT23

L1, L2 DR125-4R7-R 2 COOPER/COILTRONICS 4.7µH, 10.5m, 12.5x12.5mm Shielded

P1, P2, P5-P8 1514-2 6 KEYSTONE Test Point Turret 0.150 Pad 0.100 Thole

P19-P23 131-4353-00 5 TEKTRONIX Scope Probe Test Point PCB Mount

P3, P11, P12, P14-P18,

P24, P26-P29

P4, P30 5001 2 KEYSTONE Miniature Black Test Point 0.100 Pad

H1046-00104-50V10

OPEN

5000

GENERIC 0.1µF, 50V, X7R, 0805

KEYSTONE Miniature Red Test Point 0.100 Pad

0.040 Thole

AN1539 Rev 0.00 Page 3 of 6 February 22, 2010

Page 4

ISL8112EVAL1Z

Components List (Continued)

REF DES PART NUMBER QTY MANUFACTURER DESCRIPTION

Q1 IRF7821 1 IR 30V 13.6A HEXFET Power MOSFET Q2 IRF7832 1 IR 30V 20A HEXFET Power MOSFET Q3 IRF7807V 1 IR 30V 8.3A N-Channel Power MOSFET Q4 IRF7811AV 1 IR 30V 10.8A N-Channel Power MOSFET

R1, R8 H2512-01R00-1/10W 2 GENERIC 1, 1%, 0805

R15 H2512-01503-1/10W1 1 GENERIC 150k, 1%, 0805

R2, R7, R9, R11, R13,

R14, R18, R19, R20,

R22, R23, R27, R34

R25, R26 OPEN 0 - -

R3, R10, R12, R17,

R21, R24, R30, R31

R32 H2512-03922-1/10W1 1 GENERIC 39.2k, 1%, 0805

R4, R5, R16, R33 H2512-02003-1/10W1 4 GENERIC 200k, 1%, 0805

R6 H2512-025R5-1/10W1 1 GENERIC 25.5, 1%, 0805

SW1-SW5 78B03S 5 GRAYHILL Dip Switch SPST (Raised Slide)

U1 ISL8112IRZ 1 INTERSIL High-Efficiency, Quad Output Controller

OPEN

H2512-00R00-1/10W

GENERIC 0, 1%, 0805

Layout

FIGURE 4. TOP COMPONENTS FIGURE 5. TOP ETCH

AN1539 Rev 0.00 Page 4 of 6 February 22, 2010

Page 5

ISL8112EVAL1Z

Layout (Continued)

FIGURE 6. 2nd LAYER FIGURE 7. 3rd LAYER

FIGURE 8. BOTTOM COMPONENTS (MIRRORED) FIGURE 9. BOTTOM ETCH

AN1539 Rev 0.00 Page 5 of 6 February 22, 2010

Page 6

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