Rev.1.00 Oct 2017

User’s M

anual

ISL8117ADEMO4ZUser’s Manual: Buck-Boost Demo Board

Industrial Analog and Power

UG117 Rev.1.00 Page 2 of 16Oct 23, 2017

UG117Rev.1.00

Oct 23, 2017

ISL8117ADEMO4ZDemonstration Board

USER’S MANUAL

1. OverviewThe ISL8117ADEMO4Z buck-boost demonstration board (shown in Figures 4 and 5 on page 7) features the ISL8117A controller. The ISL8117A is a 60V high voltage synchronous buck controller that offers external soft-start and independent enable functions and integrates UV/OV/OC/OT protection. Its current mode control architecture and internal compensation network keep peripheral component count minimal. Programmable switching frequency ranging from 100kHz to 2MHz helps to optimize inductor size while the strong gate driver delivers up to 30A for the buck output.

1.1 Features• Small, compact design

• Wide input range: 6.5V to 42V

• Programmable soft-start

• Supports prebias output with SR soft-start

• PGOOD indicator

• OCP, OVP, OTP, UVP protection

1.2 Related LiteratureFor a full list of related documents, visit our website

• ISL8117A product page

Figure 1. Typical Wiring Diagram

4*22μ/50V 470μ/16V

ISL8117ADEMO4 Note:A 12V DC fan may be needed,especially at low line

VOUTVIN

UG117 Rev.1.00 Page 3 of 16Oct 23, 2017

ISL8117ADEMO4Z 1. Overview

1.3 SpecificationsThe board is designed for wide input voltage applications. The current rating of it is limited by the FETs and inductor selected. The electrical ratings of the Board are shown in Table 1.

1.4 Ordering Information

Table 1. Electrical Ratings

Parameter Rating

Input Voltage 6.5V to 42V

Switching Frequency 200kHz

Output Voltage 12V

Output Current 3A

Output Voltage Ripple 170mVP-P at 3A,VIN = 12V

Table 2. Ordering Information

Part Number Description

ISL8117ADEMO4Z High voltage PWM step-up or step-down synchronous buck-boost converter

UG117 Rev.1.00 Page 4 of 16Oct 23, 2017

ISL8117ADEMO4Z 2. Testing

2. Testing

2.1 Recommended Testing EquipmentThe following materials are recommended to perform testing:

• 0V to 42V power supply with at least 10A source current capability

• Electronic loads capable of sinking current up to 10A

• Digital Multimeters (DMMs)

• 100MHz quad-trace oscilloscope

2.2 Quick Test Guide(1) Ensure that the circuit is correctly connected to the supply and electronic loads before applying power. Refer

to Figure 2 for proper setup.(2) Turn on the power supply.(3) Adjust the input voltage VIN to a value within the specified range and observe the output voltage. The output

voltage variation should be within 5%.(4) Adjust the load current to a value within the specified range and observe the output voltage. The output

voltage variation should be within 5%.(5) Use an oscilloscope to observe output voltage ripple and phase node ringing. For accurate measurement, refer

to Figure 3 for proper test setup.

DC

Sou

rce

VIN VOUT

e-Lo

ad

ISL8117ADEMO4

(Unit Under Test)4*22μ

50V

Figure 2. Proper Test Setup

Figure 3. Proper Probe Setup to Measure Output Ripple and Phase Noise Ringing

UG117 Rev.1.00 Page 5 of 16Oct 23, 2017

ISL8117ADEMO4Z 3. Functional Description

3. Functional DescriptionThe ISL8117ADEMO4Z buck-boost demonstration board features a compact design with high efficiency and high power density.

As shown in Figure 2, 6.5V to 42V VIN is supplied to J1.1 (+) and J1.3 (-). The regulated 12V output on J4.1 (+) and J4.3 (-) can supply up to 3A to the load.

3.1 Operating RangeThe input voltage range is from 6.5V to 42V for an output voltage of 12V. The rated load current is 3A with the OCP point set at a minimum of 5A at room temperature ambient conditions.

The temperature operating range of the ISL8117A is -40°C to +125°C. Airflow is needed for higher temperature ambient conditions. For example, when VIN = 36V, a 12VDC fan is needed.

3.2 Evaluating the Other Output VoltagesThe output is preset to 12V, however, it can be adjusted. The output voltage programming resistor, R2, will depend on the desired output voltage of the regulator and the value of the feedback resistor, R1, as shown in (EQ. 1).

R2 R10.6V

VOUT 0.6V–---------------------------------- = (EQ. 1)

UG117 Rev.1.00 Page 6 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

4. PCB Layout GuidelinesCareful attention to layout requirements is necessary for successful implementation of an ISL8117ADEMO4Z based DC/DC converter. The ISL8117A switches at a high frequency and therefore, the switching times are very short. At these switching frequencies, even the shortest trace has significant impedance.

Also, the peak gate drive current rises significantly in an extremely short time. Transition speed of the current from one device to another causes voltage spikes across the interconnecting impedances and parasitic circuit elements.

These voltage spikes can degrade efficiency, generate EMI, and increase device overvoltage stress and ringing. Careful component selection and proper PC board layout minimizes the magnitude of these voltage spikes.

There are three sets of critical components in a DC/DC converter using the ISL8117A:

• The controller

• The switching power components

• The small signal components

The switching power components are the most critical from a layout point of view because they switch a large amount of energy, which tends to generate a large amount of noise. The critical small signal components are those connected to sensitive nodes or those supplying critical bias currents. A multilayer printed circuit board is recommended.

4.1 Layout Considerations(1) The input capacitors, upper FET, lower FET, and inductor and output capacitors should be placed first. Isolate

these power components on dedicated areas of the board with their ground terminals adjacent to one another. Place the input high frequency decoupling ceramic capacitors very close to the MOSFETs.

(2) If signal components and the IC are placed in a separate area to the power train, it is recommended to use full ground planes in the internal layers with shared SGND and PGND to simplify the layout design. Otherwise, use separate ground planes for power ground and small signal ground. Connect the SGND and PGND together close to the IC. DO NOT connect them together anywhere else.

(3) The loop formed by the input capacitor to the FET must be kept as small as possible.(4) Ensure the current paths from the input capacitor to the MOSFET, the output inductor, and the output

capacitor are as short as possible with maximum allowable trace widths.(5) Place the PWM controller IC close to the lower FET. The LGATE connection should be short and wide. The

IC is best placed over a quiet ground area. Avoid switching ground loop currents in this area.(6) Place the VCC5V bypass capacitor very close to the VCC5V pin of the IC and connect its ground to the

PGND plane. (7) Place the gate drive components (optional BOOT diode and BOOT capacitors) together near the controller IC.(8) The output capacitors should be placed as close to the load as possible. Use short, wide copper regions to

connect output capacitors to load to avoid inductance and resistances.(9) Use copper filled polygons or wide but short traces to connect the junction of the FET and output inductor.

Also keep the PHASE node connection to the IC short. DO NOT unnecessarily oversize the copper islands for the PHASE node. Since the phase nodes are subjected to very high dv/dt voltages, the stray capacitor formed between these islands and the surrounding circuitry will tend to couple switching noise.

(10) Route all high-speed switching nodes away from the control circuitry.(11) Create a separate small analog ground plane near the IC. Connect the SGND pin to this plane. All small signal

grounding paths including feedback resistors, current limit setting resistor, soft-starting capacitor, and EN pull-down resistor should be connected to this SGND plane.

(12) Separate the current-sensing trace from the PHASE node connection.(13) Ensure the feedback connection to the output capacitor is short and direct.(14) Properly use via array and copper to improve the heat dissipating capacity of the PCB.

UG117 Rev.1.00 Page 7 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

4.2 ISL8117A-DEMO4Z Buck-Boost Board

Figure 4. Top View

Figure 5. Bottom View

UG117 Rev.1.00 Page 8 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

4.3 Schematic

C24

100n

R29

DN

P 51

k

-+ U41

B ISL2

8213

5 67

8 4

C5 22u

D5

SS12

P2L

12

3

R10

200k

C19

47n

Q88 DN

P

D12

DN

P SM

CJ3

6(C

)A

21C

10 22u

C8 22u

L2sh

orte

d

R27

10k

Q29

AON

6248

123

4

MP

R12

DN

P

Q30

AON

6248

123

4

MP

Q23

AON

6248

123

4

MP

C7

DN

P

C13 2.2u

R20

20k

R1

43.2

k

R18

DN

P

R3

DN

P

R28

DNP NTC 100K

R32

DN

P 3.

7k

U2

ISL8

117A

MO

D/S

YNC

1

PGO

OD

2

RT

3

SS/T

RK

4

COMP5

FB6

PGND7

LGATE/OCS8

VCC

5V9

ISEN

10

PHAS

E11

UG

12

BOOT13

VIN14

EXTBIAS15

EN16

SGND17

R13

60.4

k

R24 51

k

R8

6.8

R26

1M

C22

10u

C12

100n

L1

11u

D11

5.6V

21

C6 22u

R7

6.8k

R23

4.12

k

R16

20

C11 22u

Q31

2N70

02

C15

100n

D14

3.3V

21

C9 22u

C20

100p

J2 DN

P

1 2 3 4 5

C1

2.2u

D13 8.2V

21

R33

DN

P 1M

C18

DN

PR15

20

-+ U41

A

ISL2

8213

3 21

8 4

R31DNP 10kC

14

100n

C2

2.2u

R22

10k

C23

220p

J3

DN

P JM

P

1 2 3 4

R17 0

C21

220n

J4

1 2 3 4

R2

2.26

k

R25

5.6k

R11

1k

R30

DNP 51k

R19

2.2

Q32

BC84

7

1

3 2

Q3

BC84

7

1

32

R14

22.6

k

J1

1 2 3 4 5

R4

0C16

1u

R6

22k

R9

0

R5

22k

VCC

5

LG

ISENUG

PG

SS

BT

CO

MP

FB

EXB

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PH

VIN

PH2

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UG117 Rev.1.00 Page 9 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

4.4 Bill of MaterialsTable 3. ISL8117ADEMO4Z Bill of Materials

QtyReference Designator Description Manufacturer Manufacturer Part

1 C20 CAP, SM0603, 100pF, 50V, 10%, X7R KEMET C0603C101K5RACTU

1 C14 CAP, SM0603, 0.1µF, 100V, 10%, X7R VENKEL C0603X7R101-104KNE

2 C12, C15 CAP, SM0603, 0.1µF, 16V, 10%, X7R MURATA GRM39X7R104K016AD

1 C24 CAP, SM0603, 0.1µF, 50V, 10%, X7R AVX 06035C104KAT2A

1 C16 CAP, SM0603, 1µF, 25V, 10%, X5R MURATA GRM188R61E105KA12D

1 C22 CAP, SM0603, 10µF, 16V, 10%, X5R MURATA GRM188R61C106KAALD

1 C21 CAP, SM0603, 0.22µF, 25V, 10%, X7R TDK C1608X7R1E224K

1 C13 CAP, SM0603, 2.2µF, 16V, 10%, X5R MURATA GRM188R61C225KE15D

1 C19 CAP, SM0603, .047µF, 50V, 10%, X7R PANASONIC ECJ-1VB1H473K

1 C23 CAP, SM0805, 220pF, 100V, 10%, X7R AVX 08051C221KAT2A

2 C1, C2 CAP, SM1210, 2.2µF, 100V, 10%, X7R MURATA GRM32ER72A225KA35L

6 C5, C6, C8~11

CAP, SM1210, 22µF, 16V, 10%, X7R MURATA GRM32ER71C226KE18L

1 L1 COIL-PWR INDUCT, SM17.5x16.7, 11µH, 20%,14A PULSE PG0936.113NL

L1 *(ALT) COIL-PWR INDUCT, SM17.5x16.7, 11µH, 20%, 14A ValueStar VSCC1710-110M

1 J4 CONN-HEADER, 1x4, BRKAWY 1x36, 2.54mm BERG/FCI 68000-236HLF

1 J1 CONN-HEADER, 1x5, BRKAWY 1x36, 2.54mm BERG/FCI 68000-236HLF

1 D14 DIODE-ZENER, SM2P, SOD-123, 3.3V, 500mW DIODES, INC. BZT52C3V3-7-F

1 D11 DIODE-ZENER, SMSOD-123, 500mW, 5.6V, PbFREE DIODES, INC. BZT52C5V6-7-F

1 D13 DIODE-ZENER, SM2P, SOD-123, 8.2V, 500mW DIODES, INC. BZT52C8V2-7-F

1 D5 DIODE-SCHOTTKY RECTIFER, SMTO277A, 20V, 12A VISHAY SS12P2L-M3/86A

1 U41 IC-DUAL OP AMP, RRIO, 8P, MSOP INTERSIL ISL28213FUZ

1 U2 IC-55V SWITCHING CONTROLLER, 16P, QFN INTERSIL ISL8117AFRZ

1 Q31 TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V, 115mA DIODES, INC. 2N7002-7-F

3 Q23, Q29, Q30

TRANSISTOR-MOS, N-CHANNEL, 60V, 17.5A, 8P, DFN, 5x6

ALPHA & OMEGA SEMICONDUCTOR

AON6248

2 Q3, Q32 TRANSISTOR, NPN, SM3P, SOT-23, 45V, 100mA ON SEMICONDUCTOR BC847ALT1G

2 R15, R16 RES, SM0603, 20, 1/10W, 1%, TF PANASONIC ERJ-3EKF20R0V

1 R8 RES, SM0603, 6.8Ω, 1/10W, 1%, TF VENKEL CR0603-10W-6R80FT

3 R4, R9, R17 RES, SM0603, 0Ω, 1/10W, TF VENKEL CR0603-10W-000T

1 R11 RES, SM0603, 1k, 1/10W, 1%, TF PANASONIC ERJ-3EKF1001V

2 R22, R27 RES, SM0603, 10k, 1/10W, 1%, TF VENKEL CR0603-10W-1002FT

1 R26 RES, SM0603, 1M, 1/10W, 1%, TF PANASONIC ERJ-3EKF1004V

1 R20 RES, SM0603, 20k, 1/10W, 1%, TF VENKEL CR0603-10W-2002FT

1 R10 RES, SM0603, 200k, 1/10W, 1%, TF VENKEL CR0603-10W-2003FT

2 R5, R6 RES, SM0603, 22k, 1/10W, 1%, TF VENKEL CR0603-10W-2202FT

1 R2 RES, SM0603, 2.26k, 1/10W, 1%, TF YAGEO RC0603FR-072K26L

1 R14 RES, SM0603, 22.6k, 1/10W, 1%, TF VENKEL CR0603-10W-2262FT

1 R23 RES, SM0603, 4.12k, 1/10W, 1%, TF PANASONIC ERJ-3EKF4121V

UG117 Rev.1.00 Page 10 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

1 R1 RES, SM0603, 43.2k, 1/10W,1%, TF YAGEO RC0603FR-0743K2L(PbFREE)

1 R24 RES, SM0603, 51k, 1/10W, 1%, TF YAGEO RC0603FR-0751KL

1 R25 RES, SM0603, 5.6k, 1/10W, 1%, TF PANASONIC ERJ-3EKF5601V

1 R7 RES, SM0603, 6.8k, 1/10W, 1%, TF YAGEO RC0603FR-076K8L

1 R13 RES, SM0603, 60.4k, 1/10W, 1%, TF PANASONIC ERJ-3EKF6042V

1 R19 RES, SM0805, 2.2Ω, 1/8W, 1%, TF PANASONIC ERJ-6RQF2R2V

1 L2 0µH (WIRE, 22AWG, SOLID, BUS COPPER JUMPER)

0 R3, R12, R18, R28~33, C7, C18, D12, J2, J3, Q88

DO NOT POPULATE OR PURCHASE

Table 3. ISL8117ADEMO4Z Bill of Materials (Continued)

QtyReference Designator Description Manufacturer Manufacturer Part

UG117 Rev.1.00 Page 11 of 16Oct 23, 2017

ISL8117ADEMO4Z 4. PCB Layout Guidelines

4.5 PCB Layout

Figure 7. Assembly Top Figure 8. Layer 1 - Top

Figure 9. Layer 2 (Solid Ground) Figure 10. Layer 3

Figure 11. Layer 4 - Bottom Figure 12. Assembly - Bottom

L2

C2

C23

Q29

Q30

R19

R20

D13 Q32

L1

Q31

Q23

D5

C8

J3

C9

C7

J4

VIN

GNDVIN

GND

REV.A0

EN

ISL8117A-buck-boost

EN GND VOUT

VOUT

GND

J2

J1

D12

R13

R16

C1R4

R8

C16

C22

R7

R5

C14 R9

R2 R6

C19

C20

C21

R1

R10

U2

C13

C12

R14

R17

R25

R24

R3

R28

R30

C15

C18

R12 R15

D14

R18

Q3Q88

R26R27

R23

C24

R29

R22

R31

U41

R11

R32

R33

D11

C10

C6

C5

C11

ISL8117A-BUCK-BOOST

UG117 Rev.1.00 Page 12 of 16Oct 23, 2017

ISL8117ADEMO4Z 5. Typical Evaluation Board Performance Curves

5. Typical Evaluation Board Performance Curves

VIN = 24V, VOUT = 12V, unless otherwise noted.

Figure 13. Efficiency Figure 14. Load Regulation

Figure 15. Start-Up Waveforms (VIN = 12V, IOUT = 0A)

Figure 16. Shutdown Waveforms (VIN = 12V, IOUT = 0A)

Figure 17. Start-Up Waveforms (VIN = 12V, IOUT = 3A)

Figure 18. Shutdown Waveforms (VIN = 12V, IOUT = 3A)

80

82

84

86

88

90

92

94

96

98

100

0.5 1.0 1.5 2.0 2.5 3.0

IOUT (A)

9 V 12 V

24 V 36 V

EF

FIC

IEN

CY

(%

)

12.4

12.41

12.42

12.43

12.44

12.45

12.46

12.47

12.48

12.49

12.5

0.0 0.5 1.0 1.5 2.0 2.5 3.0

IOUT (A)

9 V 12 V

24 V 36 V

VO

UT

(%

)

VO 5V/DIV

VIN 10V/DIV

IO 1A/DIV

20ms/DIV

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

20ms/DIV

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

20ms/DIV

VO 5V/DIV

VIN 10V/DIV

IO 1A/DIV

10ms/DIV

UG117 Rev.1.00 Page 13 of 16Oct 23, 2017

ISL8117ADEMO4Z 5. Typical Evaluation Board Performance Curves

Figure 19. Start-Up Waveforms (VIN = 36V, IOUT = 0A)

Figure 20. Shutdown Waveforms (VIN = 36V, IOUT = 0A)

Figure 21. Start-Up Waveforms (VIN = 36V, IOUT = 3A)

Figure 22. Shutdown Waveforms (VIN = 36V, IOUT = 3A)

Figure 23. Load Transient,(IOUT = 0.75 to 2.25A)

Figure 24. Output Ripple (IOUT = 3A, VIN = 12V)

VIN = 24V, VOUT = 12V, unless otherwise noted. (Continued)

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

20ms/DIV 20ms/DIV

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

20ms/DIV

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

10ms/DIV

VO 5V/DIV

IO 1A/DIV

VIN 10V/DIV

1.0ms/DIV

IO 1.0A/DIV

VO 500mV/DIV,

VIN 10V/DIV

OFFSET: 10.V

5.0µs/DIV

VO 100mV/DIV, AC

IO 1.0A/DIV

VIN 10.0V/DIV

UG117 Rev.1.00 Page 14 of 16Oct 23, 2017

ISL8117ADEMO4Z 5. Typical Evaluation Board Performance Curves

Figure 25. Gating Signals VIN = 12V, IOUT = 3A

Figure 26. PH and PH2 Waveforms, VIN = 12V, IOUT = 3A

VIN = 24V, VOUT = 12V, unless otherwise noted. (Continued)

1.0µ/DIV

Q30 Vgs 5.0V/DIV

Q23 Vgs5.0V/DIV

Q29 Vgs5.0V/DIV

1.0µ/DIV

PH 5.0V/DIV

PH2 5.0V/DIV

ISL8117ADEMO4Z 6. Revision History

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 document is current before proceeding.

For information regarding Intersil Corporation and its products, see www.intersil.com

© Copyright Intersil Americas LLC 2017. All Rights Reserved.All trademarks and registered trademarks are the property of their respective owners.

UG117 Rev.1.00 Page 15 of 16Oct 23, 2017

6. Revision History

Rev. Date Description

1.00 Oct 23, 2017 In Figure 1 on page 2, changed from “47u/100V” to “4*22u/50V” and added a note, “A 12V DC fan may be needed, especially at low line”.In Figure 2 on page 4, changed from “47u/100V” to “4*22u/50V”.In Figure 6 on page 8, changed R13 from “91k” to “60.4k”.In Table 3 on page 9, changed R13 from “91k” to “60.4k” and the part number from “ERJ-3EKF9102V” to “ERJ-3EKF6042V”.

0.00 Apr 28, 2017 Initial release

ISL8117ADEMO4Z

UG117