febfan23sv04t_lva - Fairchild Semiconductor

User Guide for
FEBFAN23SV04T_LVA
Evaluation Board
High-Efficiency Synchronous Buck
Converter for DDR Termination
Featured Product: FAN23SV04T
Direct questions or comments
about this evaluation board to:
“Worldwide Direct Support”
Fairchild Semiconductor.com
© 2015 Fairchild Semiconductor Corporation
FEBFAN23SV04T_LVA • Rev. 1.1
Table of Contents
1. Introduction ............................................................................................................................... 3
1.1.
1.2.
Typical Applications ..................................................................................................... 3
Features ......................................................................................................................... 3
2. Evaluation Board Specifications ............................................................................................... 3
3. Schematic .................................................................................................................................. 4
4. Test Setup.................................................................................................................................. 5
4.1.
4.2.
Test Equipment ............................................................................................................. 5
Test Setup...................................................................................................................... 5
5. Configuration ............................................................................................................................ 6
5.1.
5.2.
5.3.
VDDQ Input .................................................................................................................... 6
Enable Selection............................................................................................................ 6
On board transient generator ......................................................................................... 6
6. Test Procedure .......................................................................................................................... 7
6.1.
6.2.
Measurement Procedure................................................................................................ 7
List of Test Points and Connections ............................................................................. 7
7. Performance Data and Characteristic Curves ........................................................................... 8
8. Printed Circuit Board ................................................................................................................ 9
9. Bill of Materials ...................................................................................................................... 11
10. Revision History ..................................................................................................................... 13
© 2015 Fairchild Semiconductor Corporation
2
FEBFAN23SV04T_LVA • Rev. 1.1
This user guide supports the evaluation board for the FAN23SV04T synchronous buck
regulators for Double Date Rate (DDR) tracking applications. It should be used in
conjunction with the FAN23SV04T datasheet. Please visit Fairchild’s website at
www.fairchildsemi.com.
1.
Introduction
This evaluation board highlights the FAN23SV04T synchronous buck regulators for
DDR-tracking applications, and combines Fairchild’s constant on-time control
architecture with an integrated MOSFETs to supply high-efficiency Point of Load (POL)
solutions.
1.1. Typical Applications





Servers
NVDC Notebooks
Telecommunications
Game Consoles
Storage
1.2. Features






2.
VDDQ Input Functions as Reference Input
Internal Resistive Divider Programs VOUT =0.5 VDDQ
Configurable Enable Function
On-board Transient Generator with Adjustable Load Current Slew Rate
Internal Regulator; Requires No External Bias Supply
Test Points for Probing Critical Waveforms, Efficiency Measurements
Evaluation Board Specifications
Table 1.
Evaluation Board Specifications
Description
Symbol
Value
Input Voltage
PVIN
7-15 V
VDDQ Input
VDDQ
0-3 V
VOUT
0.6 V
Switching Frequency
fSW
500 kHz
Output Load Current
IOUT
Output Voltage
0-4 A
Output Current Limit
120%
PCB Size
7 cm X 7 cm
PCB Layer
4 Layers
PCB Thickness
Maximum load current
1.6 mm
PCB Copper Thickness
© 2015 Fairchild Semiconductor Corporation
Comments
1 oz-1 oz-1 oz-1 oz
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FEBFAN23SV04T_LVA • Rev. 1.1
3.
Schematics
J17
PVIN
PVIN
C25
Open
PVIN
J29
J20
PGND PVCC
+
J30
C10
0.1uF
C11
Open
1 J2
2
3
4
PGND
PGND
1
10
PGND
3
2
1
R19 0
5
J9
VOUT
VOUT
L1 0.72uH
Open/1210
47uF/6.3V
Open/1210
Open/1210
C28
C27
17
C26
+
47uF/6.3V
+
C12
C6
Open
C23
R3
10K
C22
0.1uF
C5
100pF
C19
Open
22
C4
Open
12
47uF/6.3V
R2 1K
R20
Open
13
C18
14
Open
VSW
R4
Open
R5
1.1K
1 J7
2
VOUT 3
4
VOUT
Open/1210
15
R21 Open
1 J8
2
PGND 3
4
PGND
C29
J24
VOUT
1
5
16
SW
ILIM
SW
C3
0.1uF
2
36
J31
18
27
VDDQ
24
NC
AGND
SW
AGND
NC
4
3
2
J28
4 VSW
3
2
C13
VIN
SW
3
1
11
PVIN
5
PVIN
6
PVIN
7
PVIN
8
PVIN
9
VDDQ
FB
34
SW
4
33
SW
FREQ
AGND
VDDQ
R8
1M
31
EN
AGND
C31
Open
32
35
R9 27K
SW
PGND
R7 Open
SW
SS
23
EN 29
PVIN
NC
PGND
SS 30
SW
21
C7 15nF
VCC
20
28
C8
0.1uF
PVIN
26
BOOT
PGND
VCC
C1
10uF/25V
J23
GND
R1 0
PVCC
19
25
PVIN
PVCC
PVIN
R11 10
PGND
VCC
J12
VCC
C24
Open
U1
FAN23SV04T
37
C9
2.2uF
47uF/6.3V
J25
AGND
C21
J19
AGND
1 J1
2
3
4
PVIN
C2
10uF/25V
J21 J22
GND GND
VCC
1
2
EN
DO NOT CONNECT J6
VFB
J6
C30
Open
VDDQ
J16
VDDQ
R24
Open
SS
J18
FB
1
Q3
2N7002
R25 Open
VSTEP
C15
Open
3
J13
SS
2
J10
J14
EN
EN
Figure 1. Evaluation Board Regulator Schematic
PVIN
J3
1
2
Transient
U4 MIC5239-5.0Y S
3
IN
OUT
2
4
GND GND
1
5V
External Frequency Generator
5V
PGND
J5
EXT TR
C20
22uF/6.3V
R17
10K
R18
10K
PGND
3
4
VOUT
R15 0.24
5
6
7
8
9
2
1
C17
0.1uF
R12
499
LOAD_A
S1
SW DIP-2
U2
VCC
DIS
THIRS
CV
GND
TRIG
OUT
RST
U3
1
2
3
4
1
2
3
4
Q1
FDMS7658AS
FAN3226T
ENA
INA
GND
INB
ENB
OUTA
VDD
OUTB
8
7
6
5
OUTA
OUTB
5
6
7
8
9
8
7
6
5
LM555
3
2
1
R13
10K
R16
0.24
4
LOAD_B
R22 0
R14
25K
C16
0.1uF
R23 0
PGND
4
Q2
FDMS7658AS
3
2
1
R6 1.2K
Figure 2. Evaluation Board Transient Generator Schematic
© 2015 Fairchild Semiconductor Corporation
4
FEBFAN23SV04T_LVA • Rev. 1.1
4.
Test Setup
4.1. Test Equipment



0-15 V / 5 A power supply for input voltage
Oscilloscope to view waveforms
0-5 V / 0.1 A power supply for optional external enable signal
4.2. Test Setup





Adjust VIN power supply, VDDQ supply, and external EN supply to 0 V.
Connect VIN supply to PVIN (J1) and GND (J2).
Connect VDDQ supply to VDDQ (J16) and AGND (J19).
Connect external enable source to EN (J14) and AGND (J25).
Optional filter can be installed to filter VDDQ track input source local to evaluation
board if needed. With filter installed, VDDQ voltage at (J16) is half (½) the voltage of
the VDDQ supply.
Optional
Filter
Ext enable
(0-5VDC)
0.1uF
5k
5k
VDDQ
Supply
(0-3VDC)
PVIN
Supply
(0-15VDC)
Output Load
(0-4A DC)
Figure 3. Test Setup for FAN23SV04T Tracking Application
© 2015 Fairchild Semiconductor Corporation
5
FEBFAN23SV04T_LVA • Rev. 1.1
5.
Configuration
5.1. VDDQ Input
Figure 3 shows an optional filter on the VDDQ (tracking) input. This filter is not required
for operation, but is useful to filter the VDDQ supply voltage input, which is used to
develop the reference for the output voltage. This can help reduce frequency jitter.
5.2. Enable Selection
The FAN23SV04T evaluation board can be enabled using an external enable logic signal
as shown in Figure 3. R8 can be populated with 1 MΩ to hold EN LOW by default.
5.3. On board transient generator
Transient generator circuitry, shown in Figure 2, is included on the bottom of the board to
facilitate testing of extremely fast transient loads, with the following usage guidelines:








A shorting jumper installed in J3 enables the transient generator.
Open J3 to conduct efficiency testing.
R13 and R14 adjust the frequency and duty cycle of the 555 timer.
J5 can be used to monitor transient frequency and to trigger oscilloscope.
Switch S1 enables turn-on of load switch Q1, Q2, or both simultaneously.
Load applied with Q1 ON is equal to VOUT/R15; with Q2 ON is equal to VOUT/R16.
Use low duty cycle to minimize power dissipation on PCB.
R22/R23 can be increased in value to reduce load current slew rate.
© 2015 Fairchild Semiconductor Corporation
6
FEBFAN23SV04T_LVA • Rev. 1.1
6.
Test Procedure
6.1. Measurement Procedure
1. Set up equipment and board as shown in Figure 3.
2. For efficiency testing, open J3 (disable transient generator).
3. Adjust load to sink 0 A.
4. Monitor VIN on J17(+) and J23(-) as voltage is increased from 0 V to 12 V.
5. Adjust the external enable signal to 3.3 V to enable converter operation.
6. Adjust the VDDQ signal from 0 to 1.5 V, monitoring on the VDDQ pin.
7. Monitor PVCC on J20(+) and J19(-) as voltage is increased from 0 to 5 V.
8. Monitor VOUT on J24(+) and J23(-).
9. With IOUT from 0 to maximum IOUT; VOUT should remain in regulation.
10. To disable the converter, adjust external enable signal to 0 V.
11. After converter is disabled, reduce PVIN to 0 V.
6.2. List of Test Points and Connections
Test Points
Name
Description
J1
J2
J3
J5
J6
J7
J8
J9
J10
J12
J13
J14
J16
J17
J18
J19
J20
J21
J22
J23
J24
J25
J28
J29
J30
J31
PVIN
GND
Transient
Ext TR
EN
VOUT
GND
VOUT
VSTEP
VCC
SS
EN
VDDQ
PVIN
FB
AGND
PVCC
GND
GND
GND
VOUT
AGND
VSW
PGND
VIN connection (+)
VIN connection (-)
Connects PVIN to power transient generator
External Transient Generator Frequency Monitor
Connects EN to VCC for auto-enable with non-SV parts
VOUT connection (+)
VOUT connection (-)
VOUT scope jack
Input to optional VOUT step circuit
Monitor VCC voltage
SS(Soft-Start) pin 30
Enable input to controller
VDDQ Track input
Input voltage (+)
Feedback pin 27
© 2015 Fairchild Semiconductor Corporation
PVCC supply input (+)
Input voltage (-)
VOUT monitor (-)
VOUT monitor (+)
AGND reference for EN input
Switch node scope jack
PVCC supply input (-)
No connect
No connect
7
FEBFAN23SV04T_LVA • Rev. 1.1
7.
Performance Data and Characteristic Curves
Figure 4. Typical Startup Waveforms with VDDQ before EN Applied
Figure 5. Typical Shutdown Using EN
© 2015 Fairchild Semiconductor Corporation
8
FEBFAN23SV04T_LVA • Rev. 1.1
8.
Printed Circuit Board
Figure 6.
Top Side
Figure 7. Bottom Side
© 2015 Fairchild Semiconductor Corporation
9
FEBFAN23SV04T_LVA • Rev. 1.1
© 2015 Fairchild Semiconductor Corporation
Figure 8.
Inner Layer 1
Figure 9.
Inner Layer 2
10
FEBFAN23SV04T_LVA • Rev. 1.1
9.
Bill of Materials
Reference
Value
Description
Manufacturer PN
Manufacturer
Case
Qty
C1
10 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
TMK316B7106KL-TD
Taiyo Yuden
1206
1
C2
10 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
TMK316B7106KL-TD
Taiyo Yuden
1206
1
C3
0.1 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
C1608X7R1E104K
TDK
0603
1
C4
0.1 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
C1608X7R1E104K
TDK
0603
1
C5
100 pF
Capacitor, SMD,
Ceramic, NPO, 50 V
C1608COG1H101J
TDK
0603
1
C7
0.015 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
C1608X7R1E153K
TDK
0603
1
C8
0.1 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
C1608X7R1E104K
TDK
0603
1
C9
2.2 µF
Capacitor, SMD,
Ceramic, X5R, 25 V
C1608X5R1E225M
TDK
0603
1
C10
0.1 µF
Capacitor, SMD,
Ceramic, X7R, 25 V
C1608X7R1E104K
TDK
0603
1
C18
47 µF
Capacitor, SMD,
Ceramic, 6.3 V
C3216X5R0J476M
TDK
1206
1
C21
47 µF
Capacitor, SMD,
Ceramic, 6.3 V
C3216X5R0J476M
TDK
1206
1
C22
47 µF
Capacitor, SMD,
Ceramic, 6.3 V
C3216X5R0J476M
TDK
1206
1
C23
47µF
Capacitor, SMD,
Ceramic, 6.3 V
C3216X5R0J476M
TDK
1206
1
R1
0Ω
RES, SMD, 1/10W
0603
1
R2
1 kΩ
RES, SMD, 1/10W
0603
1
R3
10 kΩ
RES, SMD, 1/10W
0603
1
R5
1.1 kΩ
RES, SMD, 1/10W
0603
1
R8
1 MΩ
RES, SMD, 1/10W
0603
1
R9
27 kΩ
RES, SMD, 1/10W
0603
1
R11
10 Ω
RES, SMD, 1/10W
0603
1
R19
0Ω
RES, SMD, 1/10W
0603
1
L1
720 nH
Inductor, Power
U1
FAN23SV04T
744325072
Wurth
1
MLP
5.5x5
4 A COT Regulator
FAN23SV04T
Fairchild
1
J1-J2, J7-J8
Terminal, 15 A, Screw,
Vertical, PC Mount
8191
Keystone
4
J10,J12-14,
J16-25, J29
Testpin, Gold, 40 mil
3103-2-00-21-00-00-08-0
(DS10P11)
Mill-Max
(Young Jin)
15
PCB
PCB, FAN23SV04T
EB Rev 0.1, Jan 13
1
Continued on the following page…
© 2015 Fairchild Semiconductor Corporation
11
FEBFAN23SV04T_LVA • Rev. 1.1
Reference
Value
Description
Manufacturer PN
Manufacturer
Case
Qty
Transient Generator
C16
0.1 µF
Capacitor, SMD,
Ceramic, 25 V, X7R
C1608X7R1E104K
TDK
0603
1
C17
0.1 µF
Capacitor, SMD,
Ceramic, 25 V, X7R
C1608X7R1E104K
TDK
0603
1
C20
22 µF
Capacitor, SMD,
Ceramic, 10 V, X5R
LMK212BJ226MG-T
TAIYO YUDEN
0805
1
R6
1.2 kΩ
Resistor, SMD, 1/10W
ERJ-3EKF1201V
Panasonic
0603
1
R12
499 Ω
Resistor, SMD, 1/10W
ERJ-3EKF4990V
Panasonic
0603
1
R13
10 kΩ
Pot, 0.25W
3266W-1-103LF
Bourns
1
R14
25 kΩ
Pot, 0.25W
3266W-1-253LF
Bourns
1
R15-R16
0.24 Ω
Resistor, SMD, 1W
ERJ-1TRQFR24U
Panasonic
2512
2
R17-R18
10 kΩ
Resistor, SMD, 1/10W
ERJ-3EKF1002V
Panasonic
0603
2
R22-R23
0
Resistor, SMD, 1/10W
ERJ-3GEY0R00V
Panasonic
0603
2
U2
LM555
Timer
LM555CM
Fairchild
SO8
1
U3
FAN3226T
Driver
FAN3226TM
Fairchild
SO8
1
U4
MIC5239
LDO
MIC5239-5.0YS
Micrel
SOT223
1
J3
Generic 2-Pin SIP .100
Centers
J5
Testpin, Gold, 40 mil
3103-2-00-21-00-00-08-0
Mill-Max
1
1
Q1-Q2
FDMS7658AS
MOSFET
FDMS7658AS
Fairchild
MLP5x6
1
S1
209-2MS
Switch DIP Top Slide
Flush 6-POS
209-2MS
CTS
DIP4
1
Q1-Q2
FDMS7658AS
MOSFET
FDMS7658AS
Fairchild
MLP5x6
2
© 2015 Fairchild Semiconductor Corporation
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FEBFAN23SV04T_LVA • Rev. 1.1
10. Revision History
Rev.
Date
Description
0.0.1
November 2012
0.0.2
March 2013
Updated with changes of FAN23SV04T EB Rev0.1
0.0.3
May 2013
Added PCB structure. Updated schematic & BOM
1.0.0
June 2013
Added EVB# on page.1 & Release
1.1
May 2015
Removed “Integrated TinyBuck” & Changed TOP side picture of PCB layout
Initial draft of FAN23SV04T
WARNING AND DISCLAIMER
Replace components on the Evaluation Board only with those parts shown on the parts list (or Bill of Materials) in the Users’ Guide. Contact an
authorized Fairchild representative with any questions.
This board is intended to be used by certified professionals, in a lab environment, following proper safety procedures. Use at your own risk. The
Evaluation board (or kit) is for demonstration purposes only and neither the Board nor this User’s Guide constitute a sales contract or create any kind
of warranty, whether express or implied, as to the applications or products involved. Fairchild warrantees that its products meet Fairchild’s published
specifications, but does not guarantee that its products work in any specific application. Fairchild reserves the right to make changes without notice to
any products described herein to improve reliability, function, or design. Either the applicable sales contract signed by Fairchild and Buyer or, if no
contract exists, Fairchild’s standard Terms and Conditions on the back of Fairchild invoices, govern the terms of sale of the products described herein.
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO
IMPROVE RELIABILITY, FUNCTION, OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR
USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR
THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or systems which, (a)
are intended for surgical implant into the body, or (b) support or
sustain life, or (c) whose failure to perform when properly used in
accordance with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the user.
2. A critical component is any component of a life support device or
system whose failure to perform can be reasonably expected to
cause the failure of the life support device or system, or to affect its
safety or effectiveness.
ANTI-COUNTERFEITING POLICY
Fairchild Semiconductor Corporation's Anti-Counterfeiting Policy. Fairchild's Anti-Counterfeiting Policy is also stated on our external website,
www.fairchildsemi.com, under Sales Support.
Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing
counterfeiting of their parts. Customers who inadvertently purchase counterfeit parts experience many problems such as loss of brand reputation,
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protect ourselves and our customers from the proliferation of counterfeit parts. Fairchild strongly encourages customers to purchase Fairchild parts
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EXPORT COMPLIANCE STATEMENT
These commodities, technology, or software were exported from the United States in accordance with the Export Administration Regulations for the
ultimate destination listed on the commercial invoice. Diversion contrary to U.S. law is prohibited.
U.S. origin products and products made with U.S. origin technology are subject to U.S Re-export laws. In the event of re-export, the user will be
responsible to ensure the appropriate U.S. export regulations are followed.
© 2015 Fairchild Semiconductor Corporation
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FEBFAN23SV04T_LVA • Rev. 1.1