an1321

ISL6228LOEVAL3Z User Guide
®
Application Note
May 17, 2007
AN1321.0
Author: Jia Wei
Introduction
Recommended Equipment
The ISL6228LOEVAL3Z evaluation board demonstrates the
performance of the ISL6228 dual-channel PWM controller.
The ISL6228 features Intersil's Robust Ripple Regulator (R3)
technology. Channel-1 output voltage is 1.5V or 1.8V,
pending the state of switch S5. Channel-2 output voltage is
1.8V. Each channel has an on-board dynamic-load
generator included for evaluating the transient-load
response. It applies a 300µs pulse of 8A load across VO1
and GND, and also a 300µs pulse of 8A load across VO2
and GND.
• (QTY 2) Adjustable 25V, 3A Power Supply
• (QTY 1) Fixed 5V, 100mA Power Supply
• (QTY 1) Fixed 12V, 100mA Power Supply
• (QTY 1) Adjustable 20A Constant Current Electronic Load
• (QTY 1) Digital Voltmeter
• (QTY 1) Four-Channel Oscilloscope
Interface Connections
• VIN1: Input voltage to the power stage of Channel-1
- J14: VIN1 positive power input
- TP20: VIN1 positive voltage sense
- J14: VIN1 return power input
- TP21: VIN1 return voltage sense
Contents of this document include:
• Recommended Test Equipment
• Interface Connections
• Test Set-up
• VIN2: Input voltage to the power stage of Channel-2
- J1: VIN2 positive power input
- TP9: VIN2 positive voltage sense
- J2: VIN2 return power input
- TP10: VIN2 return voltage sense
• Switch Descriptions
• Test Point Descriptions
• Design Criteria
• Typical Performance
- Efficiency
- Start-up
- Shut-down
- Steady State, CCM
- Steady State, DCM
- Load-transient response
• VO1: Regulated output voltage from Channel-1
- J9: VO1 positive power output
- TP13: VO1 positive voltage sense
- J10: VO1 return power output
- TP14: VO1 return voltage sense
• VO2: Regulated output voltage from Channel-2
- J7: VO2 positive power output
- TP11: VO2 positive voltage sense
- J8: VO2 return power output
- TP12: VO2 return voltage sense
• Evaluation Board Documentation
- Bill of materials
- Schematic
- Silk-screen plots
- Board layer plots
TABLE 1. DC/DC DESIGN CRITERIA
PARAMETER
VALUE
UNITS
VIN
3.3 to 25
VDC
VO
0.6 to 5
VDC
Full-load
8
ADC
PWM Frequency
270, 300
kHz
1
• VCC: +5V input voltage
- TP1: 5V positive input
- TP2: 5V return input
• +12V: Input voltage for the dynamic-load generator
- TP15: 12V positive input
- TP16: 12V return input
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1321
Test Set-up
Test-point Descriptions
+ 12V
_
• J4: Scope-probe socket for measuring PHASE1
V
TP15
OFF
+
J1
ON
S2
VIN2
_
TP16
VO2
READING
J11
OFF
TP11
• J3: Scope-probe socket for measuring the PHASE2 node
J7
+
J2
J3
J5
VO2
J8
_
TP1
ISL6228LOEVAL3Z
TP14
TP2
_
J4
J14
J10
J6
_
VO1
J9
TP13
+
VIN1
+
• J12: Scope-probe socket for measuring the current of the
Channel-1 on-board transient-load emulator
ON
S3
TP12
+
5V _
• J6: Scope-probe socket for measuring VO1
_
+
J13
VO1 INCREASE
S5
S1
OFF
OFF
ON
ON
J12
• J5: Scope-probe socket for measuring VO2
• J11: Scope-probe socket for measuring the current of the
Channel-2 on-board transient-load emulator
• TP1: Monitor the 5V positive input
• TP2: Monitor the 5V return input
• TP3: Monitor the PGOOD2 pin
S4
• TP4: Monitor the PGOOD1 pin
VO1
READING
V
+
_
FIGURE 1. TEST SET-UP
• TP5: The common node of R24 and R20; Useful for
Channel-1 loop gain measurement.
• TP6: The common node of R25 and R23; Useful for
Channel-2 loop gain measurement
• TP7: The VO1 side of R24; Useful for Channel-1 loop gain
measurement.
Switch Descriptions
• S1: Channel-1 Enable
- OFF: Short the Channel-1 EN pin to GND (disable
PWM)
- ON: Allow the Channel-1 EN pin to pull-up to +5V
(enable PWM)
• S4: Channel-1 Dynamic Load
- OFF: On-board Channel-1 dynamic load disabled
- ON: On-board Channel-1 dynamic load enabled
• S5: Channel-1 VO Increase
- OFF: VO1 is 1.5V, determined by R15 and R23.
- ON: Parallel R49 with R15. VO1 is 1.8V.
• S2: Channel-2 Enable
- OFF: Short the Channel-2 EN pin to GND (disable
PWM)
- ON: Allow the Channel-2 EN pin to pull-up to +5V
(enable PWM)
• S3: Channel-2 Dynamic Load
- OFF: On-board Channel-2 dynamic load disabled
- ON: On-board Channel-2 dynamic load enabled
2
• TP8: The VO2 side of R25; Useful for Channel-1 loop gain
measurement.
• TP9: Monitor the VIN1 positive input
• TP10: Monitor the VIN1 return input
• TP11: Monitor the positive VO1 output
• TP12: Monitor the VO1 return output
• TP13: Monitor the positive VO2 output
• TP14: Monitor the VO2 return output
• TP15: Monitor the 12V positive input
• TP16: Monitor the 12V return input
• TP17: Monitor the EN1 pin
• TP18: Monitor the gate of transistor Q18
• TP19: Monitor the EN2 pin
• TP20: Monitor the VIN2 positive input
• TP21: Monitor the VIN2 return input
AN1321.0
May 17, 2007
Application Note 1321
Typical Performance
100
100
VIN = 8V
95
90
85
EFFICIENCY (%)
EFFICIENCY (%)
90
VIN = 12V
80
VIN = 19V
75
70
85
VIN = 12V
80
VIN = 19V
75
70
65
60
VIN = 8V
95
65
0
1
2
3
4
5
6
7
8
60
0
1
2
3
4
5
6
7
8
IOUT (A)
IOUT (A)
FIGURE 2. CHANNEL-1 EFFICIENCY AT VO = 1.5V
FIGURE 3. CHANNEL-2 EFFICIENCY AT VO = 1.8V
VO1
VO1
PHASE1
PHASE1
VO2
VO2
PHASE2
PHASE2
FIGURE 4. CCM STEADY-STATE OPERATION, VIN = 12V,
VO1 = 1.5V, IO1 = 3A, VO2 = 1.8A, IO2 = 4A
FIGURE 5. DCM STEADY-STATE OPERATION, VIN = 12V,
VO1 = 1.5V, IO1 = 1A, VO2 = 1.8V, IO2 = 1A
IO2
IO1
VO2
VO1
PHASE1
FIGURE 6. TRANSIENT RESPONSE, VIN = 19V, VO = 1.5V,
IO = 0.1A/8.1A @ 2.55A/µs
3
PHASE2
FIGURE 7. TRANSIENT RESPONSE, VIN = 19V, VO = 1.8V,
IO = 0.1A/8.1A @ 2.55A/µs
AN1321.0
May 17, 2007
Application Note 1321
Typical Performance (Continued)
IO2
IO1
VO1
VO2
PHASE2
PHASE1
FIGURE 8. LOAD INSERTION RESPONSE, VIN = 19V,
VO = 1.5V, IO = 0.1A/8.1A @ 2.55A/µs
FIGURE 9. LOAD INSERTION RESPONSE, VIN = 19V,
VO = 1.8V, IO = 0.1A/8.1A @ 2.55A/µs
IO1
IO2
VO1
VO2
PHASE1
FIGURE 10. LOAD RELEASE RESPONSE, VIN = 19V,
VO = 1.5V, IO = 0.1A/8.1A @ 2.55A/µs
4
PHASE2
FIGURE 11. LOAD RELEASE RESPONSE, VIN = 19V,
VO = 1.8V, IO = 0.1A/8.1A @ 2.55A/µs
AN1321.0
May 17, 2007
Application Note 1321
Bill of Materials
QTY
REFERENCE
0
DNP (C8, C9)
2
C1, C3
3
C37, C40, C41
6
DESCRIPTION
MANUFACTURER
PART NUMBER
CAP, RADIAL, 56µF, 25V, ROHS
SANYO
25SP56M
CAP, SMD, 0603, 1000pF, 16V, 10%, X7R, ROHS
VENKEL
H1045-00102-16V10-T
CAP, SMD, 0603, 0.1µF, 16V, 10%, X7R, ROHS
MURATA
H1045-00104-16V10-T
MURATA
H1045-00105-16V20-T
CAP, SMD, 0603, 10µF, 6.3V, 20%, X5R, ROHS
TDK
H1045-00106-6R3V20-T
C2, C7, C30, C31, C36, C39 CAP, SMD, 0603, 1µF, 16V, 20%,Y5V, ROHS
2
C18, C19
2
C5, C6
CAP, SMD, 0603, 2200pF, 50V, 10%, X7R, ROHS
MURATA
H1045-00222-50V10-T
2
C20, C21
CAP, SMD, 0603, 0.15µF, 16V, 10%, X7R, ROHS
VENKEL
H1045-00154-25V10-T
2
C14, C15
CAP, SMD, 0603, 0.22µF, 25V, 10%, X7R, ROHS
TDK
H1045-00224-16V10-T
2
C4, C38
CAP, SMD, 0603, 0.22µF, 25V, 20%, X7R, ROHS
VENKEL
H1045-00224-25V20-T
2
C34, C35
CAP, SMD, 0805, 4.7µF, 16V, 10%, X5R, ROHS
PANASONIC
H1046-00475-16V10-T
0
DNP (C32, C33)
CAP, SMD, 0805, 4.7µF, 16V, 10%, X5R, ROHS
PANASONIC
H1046-00475-16V10-T
2
C16, C17
CAP, SMD, 1206, 1µF, 25V, 20%, X5R, ROHS
PANASONIC
H1065-00105-25V20-T
4
C10 to C13
CAP, SMD, 1206, 10µF, 25V, 20%, X5R, ROHS
PANASONIC
H1065-00106-25V20-T
2
C27, C29
CAP-LOW ESR,SMD, D3L, 330µF, 6.3V, 20%, POSCAP,
ROHS
SANYO
6TPF330M9L
2
C22, C24
CAP-LOW ESR,SMD, D3L, 220µF, 6.3V, 20%, POSCAP,
ROHS
NEC
PSLV0J227M(12)
SANYO
6TPF330M9L
0
DNP (C23, C25, C26, C28) CAP-LOW ESR, SMD, D3L, 330µF, 6.3V, 20%, POSCAP,
ROHS
2
J1, J13
CONN-GEN, BIND.POST, INSUL-RED, THMBNUT-GND
JOHNSON
COMPONENTS
111-0702-001
2
J2, J14
CONN-GEN, BIND.POST, INSUL-BLK, THMBNUT-GND
JOHNSON
COMPONENTS
111-0703-001
0
J3 to J6, J11, J12
CONN-SCOPE PROBE TEST POINT, PCB MNT
TEKTRONIX
131-4353-00
4
TP1, TP2, TP15, TP16
CONN-TURRET, TERMINAL POST, TH, ROHS
KEYSTONE
1514-2
KEYSTONE
5002
DIODES INC.
B340LB-13-F-T
15
TP3 to TP14, TP17 to TP19 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS
0
DNP (D3, D4)
DIODE-SCHOTTKY, SMD, SMB, 2P, 40V, 3A LOW VF,
Pb-FREE
2
D5, D6
DIODE-SCHOTTKY, SMD, SOT23, 3P, 30V, 200mA, DUAL FAIRCHILD
DIODE
BAT54S-T
2
D1, D2
LED, SMD, 4P, OTHER, POLARIZEDRED/GRN
LUMEX
SSL-LXA3025IGC
2
L1, L2
PWR CHOKE COIL, SMD, 13x12.9, 2.2µH, 20%, 18A,
ROHS
Vishay
IHLP5050FDER2R2M01
2
U2, U3
IC-HI FREQ BRIDGE DRIVER, 8P, SOIC, 100V, ROHS
INTERSIL
HIP2100IBZ
1
U1
IC-DUAL CHANNEL CONTROLLER, 28P, QFN, ROHS
INTERSIL
ISL6228HRZ
5
Q11 to Q14, Q18
TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V, 115mA,
ROHS
DIODES INC.
2N7002-7-F-T
0
DNP (Q5, Q10)
TRANSISTOR-DUAL N-CHANNEL, 8P, SOIC, 30V, 7.5A,
ROHS
FAIRCHILD
FDS6990AS
0
DNP (Q2, Q7)
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 9.1mΩ
RDS, ROHS
INTERNATIONAL
RECTIFIER
IRF7821PBF
2
Q1, Q6
TRANSIST-MOS, N-CHANNEL, 8P, SOIC, 30V, 9.1mΩ
RDS, ROHS
INTERNATIONAL
RECTIFIER
IRF7821PBF
5
AN1321.0
May 17, 2007
Application Note 1321
Bill of Materials (Continued)
QTY
REFERENCE
DESCRIPTION
MANUFACTURER
PART NUMBER
0
DNP (Q4, Q9)
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 4.0mΩ
RDS, ROHS
INTERNATIONAL
RECTIFIER
IRF7832PBF
2
Q3, Q8
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 4.0mΩ
RDS, ROHS
INTERNATIONAL
RECTIFIER
IRF7832PBF
2
Q15, Q16
TRANSISTOR-MOS, N-CHANNEL, SMD, TO-252, 30V,
20A, ROHS
VISHAY
SUD50N03-07-E3
4
R9, R52, R53, R54
RES, SMD, 0603, 2Ω, 1/10W, 1%, TF, ROHS
YAGEO
H2511-00020-1/10W1-T
0
DNP (R12, R13, R57, R58) RESISTOR, SMD, 0603, 0Ω, 1/10W, TF, ROHS
KOA
H2511-00R00-1/10W-T
10
R10, R11, R24, R25, R48,
R50, R55, R56, R59, R60
RESISTOR, SMD, 0603, 0Ω, 1/10W, TF, ROHS
KOA
H2511-00R00-1/10W-T
5
R7, R8, R21, R22, R51
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
KOA
H2511-01002-1/10W1-T
2
R20, R23
RES, SMD, 0603, 105k, 1/10W, 1%, TF, ROHS
PANASONIC
H2511-01053-1/10W1-T
2
R35, R37
RES, SMD, 0603, 1.62k, 1/10W, 1%, TF, ROHS
PANASONIC
H2511-01621-1/10W1-T
1
R49
RES, SMD, 0603, 210k, 1/10W, 1%, TF, ROHS
YAGEO
H2511-02103-1/10W1-T
2
R26, R27
RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS
KOA
H2511-02001-1/10W1-T
1
R3
RES, SMD, 0603, 19.6k, 1/10W, 1%, TF, ROHS
KOA
H2511-01962-1/10W1-T
1
R4
RES, SMD,0603, 24.3k, 1/10W, 1%, TF, ROHS
PANASONIC
H2511-02432-1/10W1-T
2
R34, R36
RES, SMD, 0603, 4.02k, 1/10W, 1%, TF, ROHS
KOA
H2511-04021-1/10W1-T
1
R14
RES, SMD, 0603, 52.3k, 1/16W, 1%, TF, ROHS
VENKEL
H2511-05232-1/10W1-T
4
R1, R2, R5, R6
RES, SMD, 0603, 499Ω, 1/10W, 1%, TF, ROHS
KOA
H2511-04990-1/10W1-T
2
R30, R31
RES, SMD, 0603, 49.9k, 1/10W, 1%, TF, ROHS
VENKEL
H2511-04992-1/10W1-T
1
R15
RES, SMD, 0603, 69.8k, 1/10W, 1%, TF, ROHS
YAGEO
H2511-06982-1/10W1-T
4
R16, R17, R28, R29
RES, SMD, 0603, 3.83k, 1/10W, 1%, TF, ROHS
ROHM
H2511-03831-1/10W1-T
2
R18, R19
RES, SMD, 0603, 845Ω, 1/10W, 1%, TF, ROHS
VENKEL
H2511-08450-1/10W1-T
2
R20, R23
RES, SMD, 0603, 80.6k, 1/10W, 1%, TF, ROHS
VENKEL
H2511-08062-1/10W1-T
1
R32
RES, SMD, 1206, 1Ω, 1/4W, 1%, TF, ROHS
VENKEL
H2513-001R0-1/4W1-T
9
R38, R40 to R47
RES, SMD, 1206, 1.5Ω, 1/4W, 1%, TF, ROHS
VENKEL
H2513-001R5-1/4W1-T
2
R33, R39
RES, SMD, 1206, 0.75Ω, 1/4W, 1%, TF, ROHS
SUSUMU
RL1632R-R750-F
5
S1 to S5
SWITCH-TOGGLE, SMD, ULTRAMINI, 1P, SPST MINI
C&K
COMPONENTS
GT11MSCBE-T
4
J7 to J10
MTG HDWR, CBL.TERMINAL-LUG and SCREW,
6 to 14AWG
BERG/FCI
KPA8CTP
6
AN1321.0
May 17, 2007
ISL6228LOEVAL3Z Evaluation Board Schematic
8
5
1
0.1UF
TITLE:
7
ENGINEER:
6
5
4
FIGURE 12. ISL6228LOEVAL3Z SCHEMATIC
3
C40
0.1UF
DNP
C32
4.7UF
C28
C34
DNP
DNP
C26
220UF
C22
C24
TP12
1UF
1.5
R46
1.5
R44
1.5
R42
1.5
TP13 R40
R38
R32
C41
0.1UF
DNP
C33
4.7UF
C25
C35
DNP
C23
DNP
C27
330UF
330UF
B
J6
PGND
TP14
J12
ISL6228LOEVAL3Z
REV.A
DATE:
APR 16, 2007
PAGE:
JIA WEI
2
1.5
6
5
R47
HI
SUD50N03_07
1.5
LI
HS
A
Q16
R45
HO
R37
1.62K
7
1.5
VSS
R36
R39
HB
J10
4.02K
0.75
S5
3
Q14
4
2N7002-7-F
TP18
C37
8
10K
2
8
R33
R51
Q18
C6
1500PF
+5V
10UF
845
TP8
2N7002
R19
1
U3
HIP2100
VDD
LO
0.75
S4
105K
2K
C19
R27
R49
+12V
ON
0
VO1
C20
0.15UF
1UF
OFF
R25
210K
J9
R43
R28
ROUTE PGND1 TO Q3,Q4 PADS
OFF
TP6
69.8K
Q12
220UF
1
FDS6990S
R23
R15
2N7002
J11
D6
BAT54S
A
5
R41
+5V
SUD50N03_07
6
C31
S1
DNP
R31
10K
DNP
GND
Q15
L1
2.2UH
3.83K
D1
RED
ON
R22
TP17
HI
R35
1.62K
7
C
PLACE R12,R56 CLOSE TO L1
49.9K
499
R17
3.83K
0
8
7
LI
HS
8
TP16
1.5
8
9
10
11
12
13
14
R11
10K
2
1
HO
C29
Q4
VSS
R60
1UF
Q3
Q5
HB
R34
4.02K
J4
FDS6990S
R12
IRF7832 DNP
6
5
DNP
DNP
4
3
C15
0.22UF
Q5
Q2
0
DNP
10UF
C18
Q1
3
Q13
4
2N7002-7-F
R56
1UF
10UF
C17
C11
C9
1UF
TP21
IRF7821
D4
FB1
VO1
OCSET1
EN1
PHASE1
UGATE1
BOOT1
15
J14
2
16
PGND
10UF
C13
2
R52
C7
TP20
17
PGND1
VIN1
J13
0
TP4
R50
18
LGATE1
PVCC1
PGOOD1
EP
29
R8
499
R6
ISL6228CRZ
FSET1
7
0.01UF
GRN
VIN1
6
19
R53
0.22UF
C3
20
PGND2
VCC1
5
21
LGATE2
U1
VCC2
4
24.3K
PVCC2
VIN2
3
1UF C38
BOOT2
C39
2
C2 0.22UF
1UF C36
R4
FSET2
1
2
J8
+12V
+12V
TP15
1 OF 1
1
Application Note 1321
1
U2
HIP2100
LO
VDD
C30
S3
28
27
26
25
24
23
22
R3
19.6K C4
2K
PGOOD2
FB2
VO2
OCSET2
EN2
PHASE2
UGATE2
R9 2
2 R10
0
R54
0.01UF
R59
+12V
ON
R26
J5
PGND
C21
0.15UF
0
R16
3.83K
OFF
VO2
D5
BAT54S
C1
TP11
R29
3.83K
1.5
FDS6990S
ROUTE PGND2 TO Q8,Q9 PADS
0
R13
DNP
DNP
DNP
2.2UH
DNP
2
1
8
7
R57
Q10
Q9
R30
Q8
D
L2
DNP
IRF7832 DNP
J7
PLACE R13, R55 CLOSE TO L2
49.9K
0.22UF
J3
FDS6990S
R55
C14
6
5
DNP
R58
Q10
Q7
0
1UF
10UF
C16
C10
10UF
C12
C8
DNP
D3
TP7
Q6
4
3
0
10K
Q11
R2
IRF7821
R21
2N7002
B
TP10
R24
105K
S2
OFF
1500PF
TP19
499
RED
R1
R20
52.3K
ON
C5
845
R14
D2
7
GRN
499
R5
R7
10K
TP5
R18
TP3
R48
GND
0
J2
DNP
PGND
TP2
C
2
3
J1
TP9
+5V
TP1
D
4
VIN2
DNP
+5V
6
7
AN1321.0
May 17, 2007
Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout
FIGURE 13. TOP SILKSCREEN
8
AN1321.0
May 17, 2007
Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout (Continued)
FIGURE 14. BOTTOM SILKSCREEN
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Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout (Continued)
FIGURE 15. LAYER 1
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Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout (Continued)
FIGURE 16. LAYER 2
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Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout (Continued)
FIGURE 17. LAYER 3
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Application Note 1321
ISL6228LOEVAL3Z Evaluation Board Layout (Continued)
FIGURE 18. LAYER 4
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
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