an1467

Description
Features
The ZL2105 is an innovative mixed-signal
power management and conversion IC that
combines an integrated step-down DC-DC
converter with key power and thermal
management functions in a single package. The
ZL2105EV2 platform allows evaluation of the
features in the highly configurable ZL2105 in
either stand-alone mode or via an I2C/SMBus
interface.
•
•
•
•
•
•
•
A USB-to-SMBus adapter board can be used to
connect the ZL2105EV2 board to a PC. The
PMBus command set is accessed by using the
Zilker Labs PowerNavigator™ evaluation
software from a PC running Microsoft
Windows.
Target Specifications
Small, compact design
PMBus control
Pin-strap selection for stand-alone operation
VOUT settable from +0.6 V to +5 V
Convenient power connection
Onboard enable switch
Power good indicator
This board has been designed as a buck
regulator for the following conditions:
• VIN = 12 V (Board range 4.5 V to 14 V)
• VOUT = 3.3 V (Board range 0 to 5 V)
• IMAX = 3 A (Board range 0 to 3 A)
• fsw = 400 kHz
• Efficiency: 83% peak
• Output ripple: 0.5%
• Dynamic response: 3% (1–2A step, di/dt=2.5A/µs)
• Temperature: 25°C
POWER IN
SW1
EN
POWER OUT
ZL2105
VTRK
J13
J12
SYNC
SMBus
Track Input
SYNC
SMBus
Track Output
PG
3
Figure 1. ZL2105EV2 Block Diagram
ZL2105EV2
Functional Description
The ZL2105EV2 provides all circuitry required
to demonstrate the features of the ZL2105. The
ZL2105EV2 has a functionally-optimized
ZL2105 circuit layout that allows efficient
operation up to the maximum output current.
Power and load connections are provided
through plug-in sockets.
Operation
Stand Alone Operation
The ZL2105 is easy to setup and operate. It is
configured, out of the box, to provide 3.3 V at
3 A from a 12 V source. All input and output
connections should to be made before turning
the input supply on.
Stand alone operation is achieved using the pinstrap settings for the device. The pin-strap
settings are described in the ZL2105 data sheet
[1].
When the input power supply is turned on, the
ZL2105 will output the configured voltage and
the load applied to VOUT+/VOUT- can be
varied.
The ZL2105 Evaluation Board is shown in
Figure 2. The SMBus address is selectable
through jumpers on the top side of the board. All
power to the board (VIN and I2C bus) must be
removed before changing the jumpers. The back
side of the board has 0402 resistor footprints for
setting the application pins using resistors.
To modify the pin-strap setting of the ZL2105,
input power must be turned off. The user pinstrap resistor pads are on the bottom side of the
ZL2105EV2 PCB. Once the desired pin-strap
settings and component changes have been
applied, power can be turned on and the output
can be evaluated for the newly configured mode.
Refer to the ZL2105 data sheet [1] for pin-strap
and resistor setting information. Refer to Figure
2 for resistor pad locations.
The hardware enable function is controlled by a
toggle switch on the ZL2105EV2 board. The
power good (PG) LED is powered from the
SMBus/I2C source; it indicates the correct state
of PG when external power is applied to the
ZL2105EV2 board. The right angle headers at
opposite ends of the board are for connecting a
USB to I2C control board or for daisy chaining
of multiple evaluation boards.
Figure 3 shows the ZL2105 operational circuit.
The circuit consists of the ZL2105 power
conversion and management IC with its minimal
component count to realize a buck converter.
The board layout has been optimized for thermal
performance. For thermal design considerations
relating to the ZL2105, refer to Zilker Labs
application note AN10[2].
Figure 5 on Page 8 illustrates the input and
output power connections for the ZL2105. The
optional input capacitors and output capacitors
are also shown on this page.
PMBus Operation
The ZL2105 utilizes the PMBus protocol. The
PMBus functionality can be controlled via USB
from a PC running the Zilker Labs evaluation
software in a Windows XP or Windows
2000/NT operating system.
Install the PowerNavigator software using the
CD included in the ZL2105EV2 kit or download
it from the web at www.zilkerlabs.com.
For PMBus operation, connect another Zilker
Labs evaluation board such as the ZL2005EV1
or the USB-to-SMBus adapter board to J12 of
the ZL2105EV2 board. When using multiple
evaluation boards together, verify that each
device is assigned a different SMBus address.
Connect the desired load and an appropriate
power supply to the input. Place the ENABLE
switch in “DISABLE” and turn on the power.
The evaluation software allows modification of
all ZL2105 PMBus parameters. Manually
configure the ZL2105 through the various
2
ZL2105EV2DSR1_0
ZL2105EV2
screens or load a predefined scenario from a
configuration file.
Use the mouse-over pop-ups for help with
PowerNavigator. Refer to Zilker Labs
application note AN13 [3] for PMBus details.
The ENABLE switch can then be moved to
“ENABLE” and the ZL2105 can be tested.
Alternately, the PMBus ON-OFF CONFIG and
OPERATION commands may be used.
Loop Compensation Settings
By default, the ZL2105 EVB is configured for
12 V to 3.3 V conversion at 3 A. The output
voltage can be changed by using the V1 and V0
resistor pads or through the use of PMBus
commands. If the output voltage is set to 1V or
below, the loop compensation needs to be
modified. Table 1 summarizes the PID settings.
This is achieved by using PMBus commands or
by modifying the PowerPlan configuration file.
Table 1. PID Settings versus Output Voltage
VOUT Range
PID Setting
1V < VOUT ≤ 5.0V
A=5000, B=-9016, C=4170
VOUT ≤1V
A=10000, B=-18101, C=8324
These settings are included in the configuration
file that is stored on the ZL2105 EVB and is
shown here and at the end of this data sheet for
reference.
For output voltages greater than 1V, the loop
compensation is set as:
#Loop compensation for 12v:3.3v,
PID_TAPS
A=5000, B=-9016, C=4170
#NLR_CONFIG Enable,1.5%,No Outer,1.5%,3,3,0
NLR_CONFIG
0xA250
When the output voltage is set to 1V or less, the
loop compensation should be:
#Loop compensation for 12V:0.8V
PID_TAPS
A=10000, B=-18101, C=8324
#NLR_CONFIG
Enable,1.5%,No Outer,2%,3,3,0
NLR_CONFIG
0xA350
ZL2105EV2DSR1_0
3
ZL2105EV2
Quick Start Guide
Stand Alone Operation
USB (PMBus) Operation
1. Set ENABLE switch to “DISABLE”
1. Follow step 1 - 4 above
2. Apply load to VOUT+/VOUT-
2. Insert the Zilker Labs Eval Kit CD
3. Connect power supply
(supply turned off)
to
VIN+/VIN-
4. Turn power supply on
5. Set ENABLE switch to “ENABLE”
6. Test ZL2105 operation
7. To change hardware settings, turn input
power supply OFF, modify resistor settings
and then turn the input power supply ON
3. Connect USB-to-SMBus adapter board to
J12 of ZL2105EV2
4. Connect supplied USB cable from computer
to USB-to-SMBus adapter board
a. Upon first-time connection, the Found
New Hardware Wizard will appear.
b. Windows XP users: Select ‘No’ at
prompt to search the Internet for
drivers.
c. Follow the steps on the screen to install
the drivers from the CD.
5. Install the PowerNavigator evaluation
software by running setup.exe from the
PowerNavigator_installer folder on the CD.
6. Set voltage to desired value in GUI.
7. Set ENABLE switch on EVB to “ENABLE”
8. Monitor and configure EVB using PMBus
commands in the evaluation software
9. Test the ZL2105 operation using the
evaluation software.
4
ZL2105EV2DSR1_0
ZL2105EV2
SMBus Address
Jumper settings
Pin-strap
resistor settings
Figure 2. ZL2105EV2 Evaluation Board
(Top Side and Bottom Side)
ZL2105EV2DSR1_0
5
ZL2105EV2
Schematics
Figure 3. ZL2105EV2 Circuit
6
ZL2105EV2DSR1_0
ZL2105EV2
Figure 4. ZL2105EV2 Interface
ZL2105EV2DSR1_0
7
ZL2105EV2
Figure 5. ZL2105EV2 Power I/O
8
ZL2105EV2DSR1_0
ZL2105EV2
Board Layout – 4 Layers
Figure 6. PCB – Top Layer
ZL2105EV2DSR1_0
9
ZL2105EV2
Figure 7. PCB – Inner Layer 1 (Viewed from Top)
10
ZL2105EV2DSR1_0
ZL2105EV2
Figure 8. PCB – Inner Layer 2 (Viewed from Top)
ZL2105EV2DSR1_0
11
ZL2105EV2
Figure 9. PCB – Bottom Layer (Viewed from Top)
12
ZL2105EV2DSR1_0
ZL2105EV2
Typical Performance Data for Buck Regulator
Unless noted: Vin = 12V, Vout = 3.3V, fSW = 400kHz, TA = +25°C
95
90
Efficiency (%)
VIN =5V
85
VIN =12V
80
75
VOUT=3.3V
fSW =400kHz
70
0
0.5
1
1.5
2
2.5
3
3.5
Output Current (A)
Figure 10. Measured Efficiency
Figure 11. Ripple
ZL2105EV2DSR1_0
13
ZL2105EV2
Figure 12. Dynamic Response (1 – 2A load step, di/dt=1A/µs)
Figure 13. Dynamic Response (2 - 1A load step, di/dt=1A/µs)
14
ZL2105EV2DSR1_0
ZL2105EV2
Bill of Materials
ITEM QTY
REFDES
1
2 C1,C4
2
1 C2
3
1 C3
4
1 C5
5
1 C6
6
3 C7,C9,C10
7
1 C8
8
1 C11
9
1 C12
10
1 C63
11
3 C67,C68,C69
12
1 C113
13
1 D10
14
1 D12
15
2 D13,D15
16
1 FB1
17
1 JP11
18
2 J1,J2
19
1 J12
20
1 J13
21
1 J15
22
2 J24,J25
23
1 L2
24
1 Q12
25
1 R1
27
1 R17
28
1 R18
29
1 R19
30
1 R20
31
1 R21
32
2 R120,R125
33
1 R121
34
1 R126
35
3 R127,R128,R131
36
1 R129
37
1 R130
38
2 R143,R144
39
1 R150
40
2 R155,R156
42
1 SW1
44
1 U1
45
1 U10
47
2 XX8,XX9
48
4 XX20,XX21,XX22,XX23
49
4 XX24,XX25,XX26,XX27
50
4 XX30,XX31,XX32,XX33
51
1 XX34
VALUE
4.7u
10u
1u
47n
10u
47u
100n
220u
10n
180u
22u
1u
STPS20L45CG
LED Green
BAT54XV2T1G
1000Z
4 PIN
CON2_Banana
HEADER 5X2
HEADER 5X2
HEADER 5x2 PIN
2 PIN
4.7u
2N7002/SOT
91
10.0k
11.0k
12.1k
13.3k
14.7k
100k
392
2.21k
21.5k
49R9
49R9
49R9
499
0
SW_SPDT
ZL2105
MIC2920A-3.3WS
TOL RATING
TYPE
20%
10V
X5R
20%
6.3V
X5R
10%
25V
X5R
10%
25V
X7R
20%
16V
X5R
20%
6.3V
X5R
10%
50V
X7R
20%
6.3V
TANT
10%
25V
X7R
20%
16V
ELECT POLY
10%
16V
X5R
10%
10V
X7R
45V
20mA
CLR
30V
SCHOTTKY
25% 50mA
MLC
SN
15A
SN
20%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
1%
5%
3.4A
60V
100mW
63mW
63mW
63mW
63mW
63mW
63mW
100mW
63mW
63mW
100mW
250mW
63mW
63mW
63mW
SN
SN
SH DRUM
N-CH
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
THK FILM
3A
400mA
PHL
PCB
PCB FOOTPRINT
SM0805
SM0805
SM0603
SM0603
SM1206
SM1206
SM0603
SM7343
SM0603
8.3X8.3_PXA_FLD
SM1210
SM0603
D-2PAK
SM0805_DIO_1C2A
SOD-523
SM0603
SIP4/100
JACK_F
HDR5DUALRA100X100
HDRF5DUALRA100X100
HDR10DUAL100X100
SIP2/100
IHLP_2525BD
SOT-23
SM0603
SM0402
SM0402
SM0402
SM0402
SM0402
SM0402
SM0603
SM0402
SM0402
SM0603
SM1206
SM0402
SM0402
SM0402
SW_TOG_SPDT
MLF36_6X6BX
SOT223_1234_FLD
SHUNT_HDR_WITH_TAB
STANDOFF_4-40
SCREW_4-40
CAP_MOLDED.25ID
BDOTLN3.0HX4.0L
MFR
PANASONIC-ECG
MURATA
TAIYO YUDEN
AVX
TDK
TDK
MURATA
NICHICON
PANASONIC-ECG
UCC
MURATA
TAIYO YUDEN
ST MICROELECT
CHICAGO MINIATURE
ON SEMI
MURATA
TYCO
EMERSON
SAMTEC
SAMTEC
SAMTEC
TYCO
TDK
ON SEMI
ROHM
MFR PN
ECJ-GVB1A475M
GRM21BR60J106ME19L
TMK107BJ105KA-T
06033C473KAT2A
C3216X5R1C106M
C3216X5R0J476M
GRM188R71H104KA93D
F910J227MNC
ECJ-1VB1E103K
APXA160ARA181MHC0G
GRM32ER61C226KE20L
LMK107BJ105KA-T
STPS20L45CG
CMD17-21VGC
BAT54XV2T1G
BLM18HD102SN1D
644456-4
108-0740-001
TSW-105-08-T-D-RA
SSQ-105-02-T-D-RA
TSW-105-07-T-D
644456-2
RLF7030T-4R7M3R4
2N7002LT1
MCR03EZPFX91R0
YAGEO
YAGEO
YAGEO
RC0402FR-07100KL
RC0603FR-07392RL
RC0402FR-072K21L
ROHM
YAGEO
YAGEO
YAGEO
YAGEO
NKK
ZILKER LABS INC
MICREL
TYCO
MCR03EZPFX49R9
RC1206FR-0749R9L
RC0402FR-0749R9L
RC0402FR-07499L
RC0402JR-070RL
G13AP
ZL2105ALNFT
MIC2920A-3.3WS
881545-2
YAGEO
BUILDING FASTENERS PMS 440 0025 PH
CAPLUGS
VC-234-8
ZILKER LABS INC
MPWB-ZL2105-004
NOT INSTALLED:
26
41
43
46
18 R2,R22,R23,R26,R27,R34,
R35,R100,R134,R135,
R136,R137,R142,R145,
R152,R153,R157,R158
1 R185
10 TP1,TP2,TP5,TP6,TP7,TP8,
TP10,TP11,TP12,TP13
1 XX1
ZL2105EV2DSR1_0
0
5%
63mW
THK FILM
SM0402
NI
T POINT S
1%
100mW
THK FILM
SM0603
TP_036H_REV1
TIEPT/10WIDE
RC0402JR-070RL
TIEPT/10WIDE
15
ZL2105EV2
Default Configuration Text
The following text is loaded into the ZL2105EV2 as default settings. Each PMBus command is loaded
via the ZL2105EV2 interface software. The # symbol is used for a comment line.
#ZL2105-002-DB08
#NOTE: This file is intended for the Rev. 1 ZL2105-EV2 with L=4.7uH,
Co=3x(47uF/2.5mohm)+(220uF/250mohm)
#Configuration File Format:
#PMBus Command <tab> Hex Value
#Erase user store & default store
RESTORE_FACTORY
STORE_USER_ALL
STORE_DEFAULT_ALL
#RESPONSES
#low FET not enabled for output OV and UV count to 2
OVUV_CONFIG
0x01
#LIMITS
VIN_UV_FAULT_LIMIT
4.5
#Set output peak/valley current protection to 4.0 to -4.0A
IOUT_OC_FAULT_LIMIT
4
IOUT_UC_FAULT_LIMIT
-4
#Set output average current protection to 3.3 to -3.3A
IOUT_AVG_OC_FAULT_LIMIT
3.3
IOUT_AVG_UC_FAULT_LIMIT
-3.3
#SETTINGS
#Set Vout to 3.3V
VOUT_COMMAND
3.30000
#Set IOUT_SCALE to 151mOhms
IOUT_SCALE
151
#Set IOUT_OFFSET to -0.4A
IOUT_CAL_OFFSET
-0.4A
#Use Rdson internal current sense method with internal tempco sensor, delay 512nS, 3 counts
MFR_CONFIG
0x8100
#Set temperature compensation at 400ppm/ C internal temp sensor
TEMPCO_CONFIG 0x04
#Set deadtime to 0ns H-L min dynamic and 16ns L-H fixed
DEADTIME_CONFIG
0x0086
DEADTIME
0x0010
#Loop compensation for 12v:3.3v, ~100mv peak under 1-2A transient @ 2.5A/us, with NLR.
PID_TAPS
A=5000, B=-9016, C=4170
#NLR_CONFIG
Enable,1.5%,No Outer,1.5%,3,3,0
NLR_CONFIG
0xA250
#Loop compensation for 12V:0.8V, ~20kHz BW, ~60deg PM, ~30mv peak under 0.5A step
#PID_TAPS
A=10000, B=-18101, C=8324
#NLR_CONFIG
Enable,1.5%,No Outer,2%,3,3,0
#NLR_CONFIG
0xA350
STORE_DEFAULT_ALL
RESTORE_DEFAULT_ALL
16
ZL2105EV2DSR1_0
ZL2105EV2
References
[1]
ZL2105 Data Sheet, Zilker Labs, Inc., 2008.
[2]
AN10 – ZL2005 and ZL2105 Thermal and Layout Guideline, Zilker Labs, Inc., 2006.
[3]
AN13 – PMBus™ Command Set, Zilker Labs, Inc., 2007.
Ordering Information
Orderable
Part Number
ZL2105EVK2
ZL2105EV2
Description
ZL2105 Evaluation Kit, one channel
ZL2105 Evaluation board only
Revision History
Date
Rev. #
1-22-08
1.0
ZL2105EV2DSR1_0
Initial Release based on ZL2105EV1 data sheet
17
ZL2105EV2
Zilker Labs, Inc.
4301 Westbank Drive
Building A-100
Austin, TX 78746
Tel: 512-382-8300
Fax: 512-382-8329
www.zilkerlabs.com
© 2008, Zilker Labs, Inc. All rights reserved. Zilker Labs, Digital-DC and the Zilker Labs Logo are trademarks
of Zilker Labs, Inc. All other products or brand names mentioned herein are trademarks of their respective holders.
Pricing, specifications and availability are subject to change without notice. Please see www.zilkerlabs.com for
updated information. This product is not intended for use in connection with any high-risk activity, including
without limitation, air travel, life critical medical operations, nuclear facilities or equipment, or the like.
The reference designs contained in this document are for reference and example purposes only. THE REFERENCE DESIGNS ARE PROVIDED "AS IS" AND "WITH ALL FAULTS" AND ZILKER LABS DISCLAIMS
ALL WARRANTIES, WHETHER EXPRESS OR IMPLIED. ZILKER LABS SHALL NOT BE LIABLE FOR
ANY DAMAGES, WHETHER DIRECT, INDIRECT, CONSEQUENTIAL (INCLUDING LOSS OF PROFITS), OR OTHERWISE, RESULTING FROM THE REFERENCE DESIGNS OR ANY USE THEREOF. Any
use of such reference designs is at your own risk and you agree to indemnify Zilker Labs for any damages resulting from such use.
18
ZL2105EV2DSR1_0
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