1
ISL8120EVAL4Z Evaluation Board Setup Procedure
Description
The ISL8120 integrates two voltage-mode synchronous buck
PWM controllers. It can be used either for dual independent
outputs or a 2-phase single-output regulator.
The ISL8120EVAL4Z evaluation board is used for performance
demo of 2/n-phase single-output applications. This application
note introduces the setup procedure and performance of the
ISL8120EVAL4Z evaluation board.
The ISL8120EVAL3Z evaluation board is for performance
demo of dual independent outputs and DDR applications.
Refer to application note AN1528 “ISL8120EVAL3Z Evaluation
Board Setup Procedure” for details of the ISL8120EVAL3Z
board.
References
•ISL8120 datasheet
Recommended Equipment
• 0V to 22V power supply with at least 20A source current
capability, battery, or notebook AC adapter.
• Two electronic loads capable of sinking current up to 30A.
• Digital multimeters (DMMs).
• 100MHz quad-trace oscilloscope.
Quick Start
1. Ensure that the circuit is correctly connected to the supply
and loads prior to applying any power.
2. Adjust the input supply to be 12V. Turn on the input power
supply.
3. Verify the output voltage is 1.2V. If PGOOD is set high, the
LED2 will be green. If PGOOD is set low, the LED2 will be
red. TP4 is the test post to monitor PGOOD.
Circuits Description
J1 and J2 are the input power terminals.
J3 and J4 are output lugs for load connections.
The input electrolytic capacitors are used to handle the input
current ripples.
Two upper and two lower Renesas “speed” series LFPAK
MOSFETs are used for each phase.
320nH PULSE surface mount inductors are used for each
phase. Under the 500kHz setup, the inductor current
peak-to-peak ripple is 7.5A at 12V input and 1.2V output.
Four SANYO POSCAP 2R5TPF470M7L (7mΩ) are used as
output E-caps.
TP2 and TP3 are remote sense posts. These pins can be used
to monitor and evaluate the system voltage regulations. If the
user wants to use these test posts for remote sense, the R29
and R31 need to be changed to higher values, such as 10Ω.
Also, the related voltage sense divider needs to be increased to
a higher resistance, such as 1k.
TP1 is a test socket to hold the scope probe to check the
output waveforms.
JP9 is used to disable the part.
JP6 is for connection of inputs of clock signal for the part to be
synchronized with.
JP5 is used for connection of ISHARE signals of multiple
boards in parallel operation applications.
JP3, JP4, R15 and R17 are used to set up the phase shift
between the 2 phases of the IC.
R27 is used to isolate the noise at PVCC caused by driving. In
3.3V applications, it is recommended to short R27 to 0 in order
to prevent VCC from dropping below POR under low input
voltage.
Evaluating the Other Output
Voltage
The ISL8120EVAL4Z kit output is preset to 1.2V/50A. VOUT1
can also be adjusted between 0.6V to 3V by changing the value
of R26 and R6 for VOUT, as given by Equation 1. The same rule
applies for VOUT2.
Ordering Information
PART NUMBER DESCRIPTION
ISL8120EVAL4Z IISL8120EVAL4Z evaluation board
R26
R6
VOUT VREF
1–
-------------------------------------------------
=where VREF = 0.6V (EQ. 1)
July 1, 2016
AN1607.2
Application Note 1607
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2010, 2013, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1607
2AN1607.2
July 1, 2016
Programming the Input Voltage
UVLO and its Hysteresis
By programming the voltage divider at the EN/FF pin connected
to the input rail, the input UVLO and its hysteresis can be
programmed. The ISL8120EVAL4Z has R20 4.32k and R21
1.62k; the IC will be disabled when input voltage drops below
2.94V and will restart until VIN recovers to be above 3.2V.
For 12V applications, it is suggested to have R20 24.9k and R21
2.43k, of which the IC is disabled when the input voltage drops
below 9V and will restart until VIN recovers to be above 10.5V.
Refer to the ISL8120 datasheet to program the UVLO falling
threshold and hysteresis. The equations are restated here in
Equations 2 and 3, where RUP and RDOWN are the upper and
lower resistors of the voltage divider at EN/FF pin, VHYS is the
desired UVLO hysteresis and VFTH is the desired UVLO falling
threshold.
Note the ISL8120 EN/FF pin is a triple function pin and the
voltages applied to the EN/FF pins are also fed to adjust the
amplitude of each channel’s individual sawtooth.
Parallel Operation for Current
Sharing Application
The ISL8120 regulator outputs can be paralleled with current
sharing control capability. The configuration for parallel
operation is shown in Typical Application VIII in the datasheet.
For this evaluation board, follow these steps to set up the parallel
operation of 2 boards:
1. Change R5 to 100Ω for both boards.
2. Use 2 wires (ISHARE, GND) connecting the ISHARE signals of
the 2 boards through JP5.
3. Use 2 wires (EN/FF, GND) connecting the EN/FF signals of the
2 boards through JP9.
4. Use 2 wires connecting from JP10 (CLKOUT, GND) of one
board to JP6 (FSYNC, GND) of another board.
5. Connecting the power supply to the inputs of the 2 boards.
6. Connecting the output of the 2 boards together and apply the
loads.
Figure 2 shows the setup picture of 2 boards in parallel
operation.
FIGURE 1. ISL8120EVAL4Z EVALUATION BOARD
RUP
VHYS
IHYS
---------------
=where IHYS = 2x30µA (EQ. 2)
RDOWN
RUP VENREF
VFTH VENREF
–
--------------------------------------------
=where VENREF = 0.8V (EQ. 3)
Application Note 1607
3AN1607.2
July 1, 2016
FIGURE 2. PARALLEL OPERATION SETUP
ISHARE
ENABLE
CLKOUT
ISHARE
ENABLE
SYNC
+ + --
+P/S
---
VIN VIN
-+ -+
VOUT VOUT
+ -
ELECTRONIC LOAD
Board 1 Board 2
Application Note 1607
4AN1607.2
July 1, 2016
ISL8120EVAL4Z Schematic
FIGURE 3. ISL8120EVAL4Z SCHEMATIC
Application Note 1607
5AN1607.2
July 1, 2016
ISL8120EVAL4Z Bill of Materials
QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
1 ea PWB-PCB, ISL8120EVAL4Z, REVA, QFN, ROHS TBD ISL8120EVAL4ZREVAPCB
1 ea C32 CAP, SMD, 0603, 100pF, 50V, 5%, C0G, ROHS PANASONIC ECJ-1VC1H101J
3 ea C24, C25, C34 CAP, SMD, 0603, 1000pF, 16V, 10%, X7R,
ROHS
VENKEL C0603X7R160102KNE
3 ea C58-C60 CAP, SMD, 0603, 0.1µF, 16V, 10%, X7R, ROHS MURATA GRM39X7R104K016AD
1 ea C40 CAP, SMD, 0603, 1µF, 16V, 10%, X5R, ROHS MURATA GRM188R61C105KA12D
1 ea C23 CAP, SMD, 0603, 10µF, 6.3V, 20%, X5R, ROHS TDK C1608X5R0J106M
1 ea C10 CAP, SMD, 0603, 150pF, 50V, 5%, NP0, ROHS PANASONIC ECJ-1VC1H151J
1 ea C8 CAP, SMD, 0603, 15000pF, 16V, 10%, X7R,
ROHS
VENKEL 0603X7R160-153KNE
1 ea C9 CAP, SMD, 0603, 2200pF, 50V, 5%, C0G,
ROHS
MURATA GRM1885C1H222JA01D
2 ea C11, C28 CAP, SMD, 0603, 0.22µF, 10V, 10%, X7R,
ROHS
AVX 0603ZC224KAT2A
1 ea C19 CAP, SMD, 0603, 2.2µF, 16V, 10%, X5R, ROHS MURATA GRM188R61C225KE15D
0 ea C4, C7, C18, C42 CAP, SMD, 0603, DNP-PLACE HOLDER, ROHS
3 ea C5, C6, C22 CAP, SMD, 0805 , 1.0µF, 25V, 10%, X5R, ROHS AVX 08053C105KAT2A
1 ea C29 CAP, SMD, 0805, 4.7µF, 25V, 10%, X5R, ROHS MURATA GRM21BR61E475KA12L
4 ea C16, C20, C21, C39 CAP, SMD, 1206, 10µF, 16V, 10%, X5R, ROHS VENKEL C1206X5R160-106KNE(Pb-FREE)
3 ea C1, C2, C3 CAP, SMD, 1210, 22µF, 25V, 10%, X5R, ROHS
0 ea C12, C13, C14, C15, C17, C33 CAP, SMD, 1210, DNP-PLACE HOLDER, ROHS
1 ea C55 CAP, RADIAL, 12.5x25, 1500µF, 25V, 20%,
ALUM.ELEC., ROHS
RUBYCON 25ZL1500M12.5X25
0 ea DNP (C56) CAP, RADIAL, 12.5x25, 1500µF, 25V, 20%,
ALUM.ELEC., ROHS
RUBYCON 25ZL1500M12.5X25
4 ea C26, C27, C30, C31 CAP, POSCAP, SMD, 7.3x4.3, 470µF, 2.5V,
20%, 7mΩ, ROHS
SANYO 2R5TPF470M7L
2 ea L1, L2 COIL-PWR INDUCTOR, SMD, 13mm, 320nH,
20%, 45A, Pb-Free
PULSE PA1513.321NLT
1 ea J2 (SEE ASSEMBLY
INSTRUCTIONS)
CONN-GEN, BIND.POST, INSUL-RED,
THMBNUT-GND
JOHNSON COMPONENTS 111-0702-001
1 ea J1 (SEE ASSEMBLY
INSTRUCTIONS)
CONN-GEN, BIND.POST, INSUL-BLK,
THMBNUT-GND
JOHNSON COMPONENTS 111-0703-001
1 ea TP1 CONN-SCOPE PROBE TEST PT, COMPACT, PCB
MNT, ROHS
TEKTRONIX 131-5031-00
1 ea TP10 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 1514-2
4 ea TP2, TP3, TP4, TP9 CONN-COMPACT TEST PT, VERTICAL, WHT,
ROHS
KEYSTONE 5007
10 ea JP1-JP10 CONN-HEADER, 1x2, RETENTIVE, 2.54mm,
0.230x0.120, ROHS"
BERG/FCI 69190-202HLF
1 ea LED2 LED, SMD, 3x2.5mm, 4P, RED/GREEN,
12/20MCD, 2V
LUMEX SSL-LXA3025IGC-TR
1 ea U1 IC-DUAL PHASE PWM CONTROLLER, 32P, QFN,
5x5, ROHS
INTERSIL ISL8120IRZ
Application Note 1607
6AN1607.2
July 1, 2016
1 ea Q1 TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V,
115mA, ROHS
DIODES, INC. 2N7002-7-F
4 ea Q5, Q6, Q9, Q10 TRANSISTOR, N-CHANNEL, 5P, LFPAK, 30V,
60A, ROHS
RENESAS TECHNOLOGY RJK0301DPB
4 ea Q3, Q4, Q7, Q8 TRANSISTOR, N-CHANNEL, 5P, LFPAK, 30V,
30A, ROHS
RENESAS TECHNOLOGY RJK0305DPB
1 ea R27 RES, SMD, 0603, 5.1Ω, 1/10W, 1%, TF, ROHS VISHAY/DALE CRCW06035R10FNEA
4 ea R5, R22, R29, R31 RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS VENKEL CR0603-10W-000T
1 ea R7 RES, SMD, 0603, 1k, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF1001V
6 ea R8, R10, R11, R15, R17, R18 RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS KOA RK73H1JT1002F
1 ea R21 RES, SMD, 0603, 1.62k, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF1621V
2 ea R6, R26 RES, SMD, 0603, 200Ω, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2000FT
2 ea R28, R30 RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS KOA RK73H1JTTD2001F
2 ea R16, R19 RES, SMD, 0603, 3.3kΩ, 1/10W, 1%, TF, ROHS ROHM MCR03EZPFX3301
2 ea R2, R3 RES, SMD, 0603, 390Ω, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF3900V
1 ea R20 RES, SMD, 0603, 4.32k, 1/10W, 1%, TF, ROHS
1 ea R9 RES, SMD, 0603, 45.3Ω, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-45R3FT
2 ea R1, R4 RES, SMD, 0603, 6.49k, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF6491V
1 ea R12 RES, SMD, 0603, 76.8k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-7682FT
0 ea R13 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS
0 ea R14, R25 RES, SMD, 0805, DNP-PLACE HOLDER, ROHS
1 ea R78 RES, SMD, 1206, 2Ω, 1/4W, 1%, TF, ROHS VENKEL CR1206-4W-02R0
2 ea J3, J4 HDWARE, MTG, CABLE TERMINAL, 6-14AWG,
LUG&SCREW, ROHS
BERG/FCI KPA8CTP
4 ea Bottom four corners BUMPONS, 0.44inW x 0.20inH, DOMETOP, ,
BLACK
3M SJ-5003SPBL
1 ea Place assy in bag BAG, STATIC, 5x8, ZIPLOC, ROHS INTERSIL 212403-013
1 ea a) J1, J2 - Studs from binding
posts
Instructions for assembly. INTERSIL ASSEMBLY INSTRUCTIONS
0 ea b) Should be cut with with
appropriate
Instructions for assembly. INTERSIL ASSEMBLY INSTRUCTIONS
0 ea c) Cutters and de-burred with
resin backed,
Instructions for assembly. INTERSIL ASSEMBLY INSTRUCTIONS
0 ea d) Aluminum oxide sander. Instructions for assembly. INTERSIL ASSEMBLY INSTRUCTIONS
1 ea LABEL-FOR SERIAL NUMBER AND BOM REV # INTERSIL LABEL-SERIAL NUMBER
ISL8120EVAL4Z Bill of Materials (Continued)
QTY UNITS REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
Application Note 1607
7AN1607.2
July 1, 2016
ISL8120EVAL4Z Board Layout
FIGURE 4. TOP SILKSCREEN FIGURE 5. TOP LAYER
FIGURE 6. 2nd LAYER FIGURE 7. 3rd LAYER
Application Note 1607
8AN1607.2
July 1, 2016
FIGURE 8. 4th LAYER FIGURE 9. 5th LAYER
FIGURE 10. BOTTOM LAYER FIGURE 11. BOTTOM SILKSCREEN (MIRRORED)
ISL8120EVAL4Z Board Layout (Continued)
Application Note 1607
9AN1607.2
July 1, 2016
FIGURE 12. BOTTOM SILKSCREEN
ISL8120EVAL4Z Board Layout (Continued)
Application Note 1607
10 AN1607.2
July 1, 2016
Test Data for ISL8120EVAL4Z
FIGURE 13. EFFICIENCY (12V VIN AND 1.2V VOUT) FIGURE 14. EFFICIENCY (12V VIN AND 3.3V VOUT)
FIGURE 15. LINE REGULATION FIGURE 16. LOAD REGULATION
FIGURE 17. OUTPUTS RIPPLE UNDER 0A LOAD FIGURE 18. OUTPUTS RIPPLE UNDER 50A LOAD
0
10
20
30
40
50
60
70
80
90
0 5 10 15 20 25 30 35 40 45 50 55
OUTPUT CURRENT (A)
EFFICIENCY (%)
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30 35 40 45 50 55
OUTPUT CURRENT (A)
EFFICIENCY (%)
1.2040
1.2045
1.2050
1.2055
1.2060
1.2065
1.2070
1.2075
1.2080
6 1011121314151617181920 2122
VOLTAGE INPUT
VOLTAGE OUTPUT
789
1.198
1.200
1.202
1.204
1.206
1.208
1.210
1.190
1.192
1.194
1.196
1 1317212529333741454953 57
VOLTAGE OUTPUT (VDC)
CURRENT OUTPUT (A)
59
Application Note 1607
11
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
AN1607.2
July 1, 2016
FIGURE 19. LOAD TRANSIENT (0A TO 50A STEP,
SLEW_RATE = 2.5A/µs)
FIGURE 20. LOAD TRANSIENT (50A TO 0A STEP,
SLEW_RATE = 2.5A/µs)
FIGURE 21. POWER-UP UNDER 50A FULL LOAD
Test Data for ISL8120EVAL4Z (Continued)
VIN
LGATE
PGOOD
VOUT
Mouser Electronics
Authorized Distributor
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ISL8120EVAL4Z