User’s Manual
Rev 0.00 Apr 2017
ISL8117ADEMO4Z
User’s Manual: Buck-Boost Demo Board
R8C/3x Series
UG117 Rev.0.00 Page 1 of 15
Apr 28, 2017
UG117
Rev.0.00
Apr 28, 2017
ISL8117ADEMO4Z
RENESAS MCU
1. Overview
The ISL8117ADEMO4Z buck-boost demonstration board (shown in Figures 5.1 and 5.2 on page 6) features the
ISL8117A. 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 Literature
For a full list of related documents, visit our website
•ISL8117A product page
1.3 Specifications
The 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.
1.4 Ordering Information
Table 1.1 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 1.2 Ordering Information
Part Number Description
ISL8117ADEMO4Z High voltage PWM step-up or step-down synchronous buck-boost converter
UG117 Rev.0.00 Page 2 of 15
Apr 28, 2017
ISL8117ADEMO4Z 1. Overview
Figure 1.1 Typical Wiring Diagram
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Apr 28, 2017
ISL8117ADEMO4Z 2. Testing
2. Testing
2.1 Recommended Testing Equipment
The 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 prior to applying any power.
Refer to Figure 2.1 for proper setup.
(2) Turn on the power supply.
(3) Adjust input voltage VIN within the specified range and observe output voltage. The output voltage variation
should be within 5%.
(4) Adjust load current within the specified range and observe 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 2.2 for proper test setup.
Figure 2.1 Proper Test Setup
Figure 2.2 Proper Probe Setup to Measure Output Ripple and Phase Noise Ringing
UG117 Rev.0.00 Page 4 of 15
Apr 28, 2017
ISL8117ADEMO4Z 3. Functional Description
3. Functional Description
The ISL8117ADEMO4Z buck-boost board is a compact design with high efficiency and high power density.
As shown in Figure 2.1, 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 Range
The 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. Note that airflow is needed for higher
temperature ambient conditions. For example, when VIN = 36V, a 12VDC fan is needed.
3.2 Evaluating the Other Output Voltages
The 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).
R2R1
0.6V
VOUT 0.6V–
---------------------------------
=(EQ. 1)
UG117 Rev.0.00 Page 5 of 15
Apr 28, 2017
ISL8117ADEMO4Z 4. PCB Layout Guidelines
4. PCB Layout Guidelines
Careful 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, 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.0.00 Page 6 of 15
Apr 28, 2017
ISL8117ADEMO4Z 5. ISL8117A-DEMO4Z Buck-Boost Board
5. ISL8117A-DEMO4Z Buck-Boost Board
Figure 5.1 Top View
Figure 5.2 Bottom View
UG117 Rev.0.00 Page 7 of 15
Apr 28, 2017
ISL8117ADEMO4Z 6. Schematic
6. Schematic
Figure 6.1 ISL8117ADEMO4Z Schematic
C24
100n
R29
DNP 51k
C5
22u
-
+
U41B
ISL28213
5
6
7
84
D5
SS12P2L
1
2
3
R10
200k
Q88
DNP
C19
47n
D12
DNP SMCJ36(C)A
2 1
C10
22u
C8
22u
L2
shorted
R27
10k
Q29
AON6248
1
2
3
4
MP
R12 DNP
Q30
AON6248
1
2
3
4
MP
Q23
AON6248
1
2
3
4
MP
C7
DNP
C13
2.2u
R20 20k
R1
43.2k
R18
DNP
R3
DNP
R28
DNP NTC 100K
R32
DNP 3.7k
U2
ISL8117A
MOD/SYNC
1
PGOOD
2
RT
3
SS/TRK
4
COMP
5
FB
6
PGND
7
LGATE/OCS
8
VCC5V 9
ISEN 10
PHASE 11
UG 12
BOOT 13
VIN 14
EXTBIAS 15
EN 16
SGND 17
R13
91k
R24
51k
R8 6.8
R26 1M
C22
10u
C12
100n
L1
11u
D11
5.6V
2 1
C6
22u
R7
6.8k
R23
4.12k
R16 20
C11
22u
Q31
2N7002
C15
100n
D14
3.3V
2 1
C9
22u
C20
100p
J2
DNP
1
2
3
4
5
C1
2.2u
D13
8.2V
2 1
R33 DNP 1M
C18
DNP
R15
20
-
+
U41A
ISL28213
3
2
1
84
R31
DNP 10k
C14
100n
C2
2.2u
R22
10k
C23
220p
J3
DNP JMP
1
2
3
4
R17
0
C21
220n
J4
1
2
3
4
R2
2.26k
R25
5.6k
R11
1k
R30
DNP 51k
R19
2.2
Q32
BC847
1
32
Q3
BC847
1
32
R14
22.6k
J1
1
2
3
4
5
R4 0
C16
1u
R6
22k
R9 0
R5
22k
VCC5
LG
ISEN
UG
PG
SS
BT
COMP
FB
EXB
RT
PH
VIN
PH2
VIN
VCC5
EN
VCC5
VCC5
EN
VOUT
VOUT
VCC5
VCC5
EN
VIN
UG117 Rev.0.00 Page 8 of 15
Apr 28, 2017
ISL8117ADEMO4Z 7. Bill of Materials
7. Bill of Materials
Table 7.1 ISL8117ADEMO4Z Bill of Materials
Qty
Reference
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.0.00 Page 9 of 15
Apr 28, 2017
ISL8117ADEMO4Z 7. Bill of Materials
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, 91k, 1/10W, 1%, TF PANASONIC ERJ-3EKF9102V
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 7.1 ISL8117ADEMO4Z Bill of Materials (Continued)
Qty
Reference
Designator Description Manufacturer Manufacturer Part
UG117 Rev.0.00 Page 10 of 15
Apr 28, 2017
ISL8117ADEMO4Z 8. PCB Layout
8. PCB Layout
Figure 8.1 Assembly Top Figure 8.2 Layer 1 - Top
Figure 8.3 Layer 2 (Solid Ground) Figure 8.4 Layer 3
Figure 8.5 Layer 4 - Bottom Figure 8.6 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
C1
R4 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
Q3 Q88
R26
R27
R23
C24
R29
R22
R31
U41
R11
R32
R33
D11
C10
C6
C5
C11
ISL8117A-BUCK-BOOST
UG117 Rev.0.00 Page 11 of 15
Apr 28, 2017
ISL8117ADEMO4Z 9. Typical Evaluation Board Performance Curves
9. Typical Evaluation Board Performance Curves
VIN = 24V, VOUT = 12V, unless otherwise noted.
Figure 9.1 Efficiency Figure 9.2 Load Regulation
Figure 9.3 Start-Up Waveforms
(VIN = 12V, IOUT = 0A)
Figure 9.4 Shutdown Waveforms
(VIN = 12V, IOUT = 0A)
Figure 9.5 Start-Up Waveforms
(VIN = 12V, IOUT = 3A)
Figure 9.6 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
EFFICIENCY (%)
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
VOUT (%)
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.0.00 Page 12 of 15
Apr 28, 2017
ISL8117ADEMO4Z 9. Typical Evaluation Board Performance Curves
Figure 9.7 Start-Up Waveforms
(VIN = 36V, IOUT = 0A)
Figure 9.8 Shutdown Waveforms
(VIN = 36V, IOUT = 0A)
Figure 9.9 Start-Up Waveforms
(VIN = 36V, IOUT = 3A)
Figure 9.10 Shutdown Waveforms
(VIN = 36V, IOUT = 3A)
Figure 9.11 Load Transient,
(IOUT = 0.75 to 2.25A)
Figure 9.12 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.0.00 Page 13 of 15
Apr 28, 2017
ISL8117ADEMO4Z 9. Typical Evaluation Board Performance Curves
Figure 9.13 Gating Signals
VIN = 12V, IOUT = 3A
Figure 9.14 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 Vgs
5.0V/DIV
Q29 Vgs
5.0V/DIV
1.0µ/DIV
PH 5.0V/DIV
PH2
5.0V/DIV
UG117 Rev.0.00 Page 14 of 15
Apr 28, 2017
ISL8117ADEMO4Z 10. Revision History
10. Revision History
Rev. Date
Description
Page Summary
0.00 Apr 28, 2017 — Initial release
ISL8117ADEMO4Z
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
UG117 Rev.0.00 Page 15 of 15
Apr 28, 2017
© Copyright Intersil Americas LLC 2017. All Rights Reserved.
All trademarks and registered trademarks are the property of their respective owners.
ISL8117ADEMO4Z User’s Manual: Hardware
Publication Date: Rev.0.00 Apr 28, 2017
Published by: Intersil, A Renesas Company
ISL8117ADEMO4Z
UG117
/