an1291

ISL6228EVAL3Z User Guide
®
Application Note
May 17, 2007
AN1291.0
Author: Jia Wei
Introduction
Recommended Equipment
The ISL6228EVAL3Z 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 4.5A load across VO1
and GND, and it applies a 300µs pulse of 5A 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
• Switch Descriptions
• 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
• 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
• Evaluation Board Documentation
- Bill of materials
- Schematic
- Silk-screen plots
- Board layer plots
• 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
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 1291
Test Set-up
Test-point Descriptions
+ 12V
_
• J4: Scope-probe socket for measuring PHASE1
V
TP15
+
OFF
OFF
ON
ON
J1
S2
VIN2
_
S3
TP16
J11
TP11
VO2
READING
J7
+
J2
J3
J5
VO2
J8
TP12
+
5V _
_
TP1
ISL6228EVAL3Z
TP14
TP2
_
J4
J14
J10
J6
_
VO1
J9
TP13
OFF
J13
VO1 INCREASE
S1
J12
OFF
ON
S5
• J12: Scope-probe socket for measuring the current of the
Channel-1 on-board transient-load emulator
• J3: Scope-probe socket for measuring the PHASE2 node
• 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
+
VIN1
+
• J6: Scope-probe socket for measuring VO1
_
+
• TP2: Monitor the 5V return input
• TP3: Monitor the PGOOD2 pin
ON
S4
• TP4: Monitor the PGOOD1 pin
VO1
READING
V
+
_
FIGURE 1. TEST SET-UP
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.
• 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.
• 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
• 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)
• TP15: Monitor the 12V positive input
• S3: Channel-2 Dynamic Load
- OFF: On-board Channel-2 dynamic load disabled
- ON: On-board Channel-2 dynamic load enabled
• TP19: Monitor the EN2 pin
2
• TP16: Monitor the 12V return input
• TP17: Monitor the EN1 pin
• TP18: Monitor the gate of transistor Q18
• TP20: Monitor the VIN2 positive input
• TP21: Monitor the VIN2 return input
AN1291.0
May 17, 2007
Application Note 1291
Typical Performance
100
100
VIN = 8V
VIN = 8V
95
95
90
85
EFFICIENCY (%)
EFFICIENCY (%)
90
VIN = 12V
80
VIN = 19V
75
85
70
65
65
0
1
2
3
4
IOUT (A)
5
6
7
8
FIGURE 2. CHANNEL-1 EFFICIENCY AT VO = 1.5V
VO1
VIN = 19V
75
70
60
VIN = 12V
80
60
0
1
2
3
4
IOUT (A)
5
6
7
8
FIGURE 3. CHANNEL-2 EFFICIENCY AT VO = 1.8V
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 = 0.5A, VO2 = 1.8V, IO2 = 0.5A
IO2
IO1
VO2
VO1
PHASE1
FIGURE 6. TRANSIENT RESPONSE, VIN = 19V, VO = 1.5V,
IO = 0.1A/4.6A @ 2.55A/µs
3
PHASE2
FIGURE 7. TRANSIENT RESPONSE, VIN = 19V, VO = 1.8V,
IO = 0.1A/5.1A @ 2.55A/µs
AN1291.0
May 17, 2007
Application Note 1291
Typical Performance (Continued)
IO2
IO1
VO2
VO1
PHASE1
FIGURE 8. LOAD INSERTION RESPONSE, VIN = 19V,
VO = 1.5V, IO = 0.1A/4.6A @ 2.55Aµs
PHASE2
FIGURE 9. LOAD INSERTION RESPONSE, VIN = 19V,
VO = 1.8V, IO = 0.1A/5.1A @ 2.55A/µs
IO1
IO2
VO2
VO1
PHASE1
FIGURE 10. LOAD RELEASE RESPONSE, VIN = 19V,
VO = 1.5V, IO = 0.1A/4.6A @ 2.55A/µs
4
PHASE2
FIGURE 11. LOAD RELEASE RESPONSE, VIN = 19V,
VO = 1.8V, IO = 0.1A/5.1A @ 2.55A/µs
AN1291.0
May 17, 2007
Application Note 1291
Bill of Materials
QTY
REFERENCE
0
DNP (C8, C9)
2
C1, C3
5
C20, C21, 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
C14, C15
CAP, SMD, 0603, 0.22µF, 16V, 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
C24, C27
CAP-LOW ESR, SMD, D3L, 330µF, 6.3V, 20%, POSCAP, ROHS
SANYO
6TPF330M9L
DNP (C22, C23, C25, C26, CAP-LOW ESR, SMD, D3L, 330µF, 6.3V, 20%, POSCAP, ROHS
C28, C29)
SANYO
6TPF330M9L
0
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
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 DIODES INC.
B340LB-13-F-T
2
D5, D6
DIODE-SCHOTTKY, SMD, SOT23, 3P, 30V, 200mA, DUAL DIODE FAIRCHILD
BAT54S-T
2
D1, D2
LED, SMD, 4P, OTHER, POLARIZEDRED/GRN
LUMEX
SSL-LXA3025IGC
2
L1, L2
PWR CHOKE COIL, SMD, 13x12.9, 3.3µH, 20%, 18A, ROHS
Vishay
IHLP5050FDER3R3M01
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
0
TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V, 115mA, ROHS DIODES INC.
2N7002-7-F-T
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
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 9.1mΩ RDS, INTERNATIONAL
ROHS
RECTIFIER
IRF7821PBF
0
DNP (Q4, Q9)
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 4.0mΩ RDS, INTERNATIONAL
ROHS
RECTIFIER
IRF7832PBF
2
Q3, Q8
TRANSISTOR-MOS, N-CHANNEL, 8P, SOIC, 30V, 4.0mΩ RDS, INTERNATIONAL
ROHS
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
KOA
H2511-00R00-1/10W-T
0
DNP (R12, R13, R57, R58) RESISTOR, SMD, 0603, 0Ω, 1/10W, TF, ROHS
5
AN1291.0
May 17, 2007
Application Note 1291
Bill of Materials (Continued)
QTY
10
REFERENCE
DESCRIPTION
R10, R11, R24, R25, R48, RESISTOR, SMD, 0603, 0Ω, 1/10W, TF, ROHS
R50, R55, R56, R59, R60
MANUFACTURER
PART NUMBER
KOA
H2511-00R00-1/10W-T
RES, SMD, 0603, 10k, 1/10W, 1%, TF, ROHS
KOA
H2511-01002-1/10W1-T
5
R7, R8, R21, R22, R51
2
R35, R37
RES, SMD, 0603, 1.07k, 1/10W, 1%, TF, ROHS
PANASONIC
H2511-01071-1/10W1-T
1
R49
RES, SMD, 0603, 162k, 1/10W, 1%, TF, ROHS
YAGEO
H2511-01623-1/10W1-T
2
R26, R27
RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS
KOA
H2511-02001-1/10W1-T
1
R3
RES, SMD, 0603, 20k, 1/10W, 1%, TF, ROHS
KOA
H2511-02002-1/10W1-T
1
R4
RES, SMD, 0603, 22.1k, 1/10W, 1%, TF, ROHS
PANASONIC
H2511-02212-1/10W1-T
2
R34, R36
RES, SMD, 0603, 2.49k, 1/10W, 1%, TF, ROHS
KOA
H2511-02491-1/10W1-T
1
R14
RES, SMD, 0603, 22.6k, 1/16W, 1%, TF, ROHS
VENKEL
H2511-02262-1/10W1-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, 53.6k, 1/10W, 1%, TF, ROHS
YAGEO
H2511-05362-1/10W1-T
4
R16, R17, R28, R29
RES, SMD, 0603, 5.76k, 1/10W, 1%, TF, ROHS
ROHM
H2511-05761-1/10W1-T
2
R18, R19
RES, SMD, 0603, 590Ω, 1/10W, 1%, TF, ROHS
VENKEL
H2511-05900-1/10W1-T
2
R20, R23
RES, SMD, 0603, 80.6k, 1/10W, 1%, TF, ROHS
VENKEL
H2511-08062-1/10W1-T
0
DNP (R32, R33)
RES, SMD, 1206, 1.5Ω, 1/4W, 1%, TF, ROHS
VENKEL
H2513-001R5-1/4W1-T
4
R41, R43, R45, R47
RES, SMD, 1206, 1.5Ω, 1/4W, 1%, TF, ROHS
VENKEL
H2513-001R5-1/4W1-T
5
R38, R40, R42, R44, R46
RES, SMD, 1206, 1.8Ω, 1/4W, 1%, TF, ROHS
VENKEL
H2513-001R8-1/4W1-T
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
AN1291.0
May 17, 2007
ISL6228EVAL3Z Evaluation Board Schematic
8
5
1
0.1UF
TP11
TITLE:
TP18
C37
8
10K
7
ENGINEER:
6
5
4
FIGURE 12. ISL6228EVAL3Z SCHEMATIC
3
0.1UF
C40
TP12
DNP
C32
C34
4.7UF
C28
DNP
C26
DNP
C24
330UF
R46
1.8
R44
R42
1.8
1.8
1.8
R38
R32
DNP
1.8
C22
DNP
C41
0.1UF
DNP
C33
C35
4.7UF
TP14
DNP
C25
C23
DNP
C27
C29
HO
LI
HS
HI
SUD50N03_07
J12
6
5
ISL6228EVAL3Z
REV.B
DATE:
APR 16, 2007
PAGE:
JIA WEI
2
A
Q16
1.5
S5
3
Q14
4
2N7002-7-F
R37
1.07K
7
R47
R51
Q18
C6
2200PF
+5V
8
1.5
590
VSS
R45
R19
HB
J6
PGND
R36
R43
R49
1
2
B
J10
1.5
2K
VO1
1.5
R27
0
162K
J9
2.49K
R39
R25
10UF
R23
80.6K
C19
R15
U3
HIP2100
LO
VDD
R33
S4
2N7002
+12V
ON
53.6K
TP8
Q12
J11
R41
C20
0.1UF
DNP
OFF
TP6
2N7002
R60
R28
5.76K
330UF
DNP
ROUTE PGND1 TO Q3,Q4 PADS
OFF
SUD50N03_07
D6
BAT54S
A
5
3.01
+5V
Q15
6
1UF
10K
S1
R35
C
GND
L1
FDS6990S
D1
RED
ON
R22
TP17
HI
TP16
1.07K
7
C31
499
R17
5.76K
0
DNP
HS
DNP
2
1
LI
0
Q4
HO
8
3.3UH
R31
R11
10K
8
7
VSS
R34
PLACE R12,R56 CLOSE TO L1
FDS6990S
Q5
HB
J8
+12V
+12V
TP15
2.49K
J4
R12
IRF7832 DNP
Q3
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
10UF
C13
C9
1UF
C11
2
R52
C7
IRF7821
D4
FB1
VO1
OCSET1
EN1
PHASE1
UGATE1
BOOT1
15
TP21
1UF
16
J14
2
PGND1
PGND
0
TP4
R50
17
LGATE1
PVCC1
PGOOD1
EP
29
R8
499
R6
ISL6228CRZ
FSET1
7
0.01UF
GRN
VIN1
6
18
TP20
R53
0.22UF
C3
19
VIN1
J13
8
9
10
11
12
13
14
R4
20
PGND2
VCC1
5
21
LGATE2
U1
VCC2
4
22.1K
PVCC2
VIN2
3
1UF C38
BOOT2
C39
2
C2 0.22UF
C36
1UF
FSET2
1
2
C30
S3
28
27
26
25
24
23
22
1
C4
U2
HIP2100
LO
VDD
J5
PGND
1 OF 1
1
Application Note 1291
R3
20K
2K
PGOOD2
FB2
VO2
OCSET2
EN2
PHASE2
UGATE2
0
R9 2
2 R10
R54
0.01UF
0
+12V
ON
R26
VO2
D5
BAT54S
C1
R59
C21
0.1UF
DNP
R16
OFF
DNP
R29
5.76K
1UF
ROUTE PGND2 TO Q8,Q9 PADS
TP13 R40
FDS6990S
R57
R13
DNP
R58
DNP
DNP
1UF
10UF
C16
10UF
C12
C8
C10
2
1
3.3UH
R30
8
7
D
L2
49.9K
Q10
Q9
J7
PLACE R13, R55 CLOSE TO L2
R55
TP7
TP19
0
J3
FDS6990S
5.76K
D2
IRF7832 DNP
Q8
10K
Q11
R2
4
3
0.22UF
6
5
DNP
R21
S2
OFF
Q10
Q7
C14
R24
80.6K
DNP
49.9K
ON
2200PF
Q6
0
40.2K
R20
TP10
IRF7821
D3
10K
499
R14
TP3
7
GRN
590
R7
2N7002
B
C5
R18
RED
R1
499
R5
0
R48
GND
TP5
J2
DNP
PGND
TP2
C
2
3
J1
TP9
+5V
TP1
D
4
VIN2
DNP
+5V
6
7
AN1291.0
May 17, 2007
Application Note 1291
ISL6228EVAL3Z Evaluation Board Layout
FIGURE 13. TOP SILKSCREEN
8
AN1291.0
May 17, 2007
Application Note 1291
ISL6228EVAL3Z Evaluation Board Layout (Continued)
FIGURE 14. BOTTOM SILKSCREEN
9
AN1291.0
May 17, 2007
Application Note 1291
ISL6228EVAL3Z Evaluation Board Layout (Continued)
FIGURE 15. LAYER 1
10
AN1291.0
May 17, 2007
Application Note 1291
ISL6228EVAL3Z Evaluation Board Layout (Continued)
FIGURE 16. LAYER 2
11
AN1291.0
May 17, 2007
Application Note 1291
ISL6228EVAL3Z Evaluation Board Layout (Continued)
FIGURE 17. LAYER 3
12
AN1291.0
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Application Note 1291
ISL6228EVAL3Z 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.
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AN1291.0
May 17, 2007