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
RT
PH
VIN
PH2
VIN
VCC
5
ENVC
C5
VCC
5
EN
VOU
T
VOU
T
VCC
5
VCC
5
ENVIN
Fig
ure
6.IS
L8
117A
DE
MO
4Z S
ch
emat
ic
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