AN1655 - Intersil

Application Note 1655
ISL8200MEVAL1PHZ Evaluation Board User’s Guide
VIN = 3V TO 20V
PGOOD
VOUT REMOTE SENSING
POINTS
MODULE
GROUP
VOUT
LOAD UP TO 10A
DIMENSIONS: 2.5 X 4.5 INCHES
VOUT MONITORING POINTS
FIGURE 1. ISL8200MEVAL1PHZ EVALUATION BOARD
ISL8200MEVAL1PHZ Evaluation
Board
The ISL8200M is a complete 10A step-down current
share-able switch mode power module in a low profile
package. It can be used in standalone single-phase operation
as well as current shared applications where multiple modules
are connected in parallel.
The ISL8200MEVAL1PHZ evaluation board is used to
demonstrate performance of the ISL8200M in a single phase
setup. The input voltage is from 3V to 20V, and the output can
support a 10A maximum load with a voltage range from 0.6V
up to 6V with the proper output capacitor rating.
Recommended Equipment
5. Push the toggle on SW1 to the left (with respect to the
board above).
6. Set the input supply to 12V.
7. Set the electronic load to a desired load current.
8. Enable the power supply first and then the load, the LED for
PGOOD will be red when the module is not regulating.
9. Push the toggle on SW1 to the right, the PGOOD LED should
now be green to indicate proper operation.
Shutdown
1. Disable the device by pushing the toggle on SW1 to the left.
2. Turn off the electronic load.
3. Turn off the power supply.
• 0V to 20V power supply with at least 15A source current
capability.
• One Electronic Load capable of sinking current up to 10A.
• Digital multi-meters (DMMs).
Quick Start
Circuits Description
PVIN and GND banana plugs are the input power terminals.
Two input electrolytic caps footprint are provided to handle the
input current ripple.
2. A multimeter can be hooked to TP310 (+) and TP34 (-) to
monitor VOUT.
Two Sanyo Poscaps (2TPF330M6, 330µF, ESR 6mΩ) are used
as output E-caps. These poscaps are rated for output voltages
up to 2V, so they should be removed if a higher VOUT is
required. The footprints of the Sanyo capacitors can
accommodate T530 (ultra-low ESR) tantalum capacitors for
higher voltages.
3. Open the jumpers marked PVIN and VCC.
VOUT and GND are output lugs for load connections.
4. Short the jumpers marked 1.2V and FIXED. This sets the
output voltage to 1.2V and sets the OCP trip point its open
condition.
VSEN+ and VSEN- are output voltage sensing points. These
pins can be used to monitor and evaluate the system voltage
regulations. If the user wants to use these test posts for
1. Connect the PVIN and GND banana jacks to a power supply
and connect a load to the VOUT and GND lugs.
August 18, 2011
AN1655.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Application Note 1655
remote sensing, RM+2, RM-2 need to be changed to higher
values, such as 10Ω.
To assess stability, RM+2 can be changed to a 100Ω resistor,
then inject the signal across VSEN+ and VSEN_PRIME.
For example, in a 5V application where it is desired to have the
part turn off at 4V and recover at 4.5V, the VHYS that goes in
Equation 3 is 0.5V.
JP201 is a SIP connector that can be used with R223 = 0Ω
installed to inject a clock signal to synchronize the module to.
The default phase shift of the CLKOUT signal from the module
causes a second module to switch with a phase shift of 180°.
This can be demonstrated on the 2-phase evaluation board,
ISL8200MEVAL2PHZ.
UVLO TURN – ON = V HYS + V FTH
R203 and C210 are small added filters for the VIN pins.
R 1 ⋅ V ENREF
R2 = --------------------------------------V FTH – V ENREF
The Overcurrent Protection (OCP) limit can be controlled by
shorting the jumper marked FIXED and populating a resistor in
R209A’s location, as per your desired OCP trip point. As another
option, by shorting the jumper marked ADJ1, you can tune the
OCP level using the potentiometer labeled R241. To measure the
resistance of R241, simply turn off the part and remove the short
across ADJ1 and place a resistance meter across it’s terminals.
If the application is in the 3.3V range, tie VIN and PVCC to 5.0V.
However, in applications that involve a PVIN greater than 5.5V,
open the jumper named PVIN, not doing so will increase the
probability of tying VCC to a voltage greater than its capability.
Shorting the jumper marked VCC will allow you to use a separate
power supply for VCC; however this is not a necessity as VCC can
be internally generated within the module.
Evaluating Other Output
Voltages
(EQ. 1)
ROS = 2.2kΩ internal
The output capacitors (C9 and C19) must be changed to support
the corresponding output voltage. The onboard output capacitors
are rated at 2V max.
Programming the Input Voltage
UVLO and its Hysteresis
By modifying the voltage divider at the EN pin connected to the
input rail (R1 and R2), the input UVLO and its hysteresis can be
programmed. The ISL8200MEVAL1PHZ evaluation board comes
stocked with R1 = 8.25kΩ and R2 = 3.01kΩ; this sets the UVLO
level at 2.9V for a 3.3V application.
For a 5V application, with a UVLO at 4V and recover at 4.5V, use
R1 = 16.6kΩ and R2 = 4.2kΩ. The UVLO equations are re-stated
in the following, where R1 and R2 are the upper and lower
resistors of the voltage divider at the EN pin respectively, VHYS is
the desired UVLO hysteresis and VFTH is the desired UVLO falling
threshold; a user selected value. Equation 2 describes VHYS as
the point past the programmed UVLO level at which the device
turns on again.
2
IHYS = N x 30µA
N = number of phases
(EQ. 3)
(EQ. 4)
VENREF = 0.8V
For 12V applications, if it is desired to have the IC disabled when
the input voltage drops below 9V and restart when VIN recovers
above 10.6V, then R1 = 53.33kΩ and R2 = 5.2kΩ.
Efficiency Measurement
The voltage and current meter can be used to measure
input/output voltage and current. In order to obtain an accurate
measurement and prevent the voltage drop of PCB or wire trace,
the voltage meter must be close to the input/output terminals.
For simplicity, the measuring point for the input voltage meter is
at the PVIN_TP terminal, and the measuring point for the output
voltage meter is at the TP310 terminal.
The efficiency equation is shown in Equation 5:
The ISL8200MEVAL1PHZ kit has several preset outputs for
convenience. 1.2V, 1.5V, 1.8V, 2.5V, 3.3V and 5.0V can be easily
selected by shorting their appropriate jumper. There is also a
potentiometer provided that will allow for any other output
voltage between 0.6V to 6V. Equation 1 governs the relationship
between the VSET resistors (R221A thru R221F) and the output
voltage.
( V OUT – V REF )
where VREF = 0.6V
R221X = ------------------------------------- ROS
( V REF )
V HYS
R1 = ------------I HYS
(EQ. 2)
( V OUT • I OUT )
P OUT
Output Power
Efficiency = ----------------------------------- = ------------- = ----------------------------------P IN
( V IN • I IN )
Input Power
(EQ. 5)
Output Ripple/Noise
Measurement
Simple steps should be taken to ensure that there is minimum
pickup noise due to high frequency events, which can be
magnified by the large ground loop formed by the oscilloscopeprobe ground. This means that even a few inches of ground wire
on the oscilloscope probe may result in hundreds of millivolts of
noise spikes when improperly routed or terminated. This effect
can be overcome by using the short loop measurement method
to minimize the measurement loop area for reducing the pickup
noise. The short loop measurement method is shown in Figure 2.
OUTPUT
CAP
OUTPUT
OUTPUT
CAP
CAP
OR MOSFET
FIGURE 2. OUTPUT RIPPLE/NOISE MEASUREMENT
AN1655.0
August 18, 2011
ISL8200MEVAL1PHZ Schematic
39,1
8)
8)
3*22'
TP310
R325
FIXED
2
2
3
2
3*22'
C201
C205
Q302
1
2
'13
8)
8)
1
3+$6(
TP301
3
R209A
19
C202
C206
9287
7%'
7%'
39,1
R241
8)
2
.
C203
18
1
66/B/;$,*&
LED301
1
ADJ1
1
R240
VOUT
&
8)
9&&
4
20
1
.
3 R324
9&&
1
.
2
.
1
R221C 1.8V
2
1
.
VSEN+_PRIME
J4
GRN
PGND
VSEN+
RED
17
9287
21
PVIN
*1'
9287
22
PHASE
3+$6(
86( *50%5$.(/ 8)
.
1
VCC
OCSET
,6/0,5=
R221A
NC
PGOOD
C234
PGND1
16
23
R221B 1.5V
2
4
1.2V
10UF
8)
C209
1
5
PVCC
15
8)
2
6
U1
C210
3
7
8
10
9
11
R206
VIN
C255
8)
3)
C204
3
.
1
RM+2
1
.
1
1
ADJ
2
2
2
1
.
.
1
R221E 3.3V
2
R221D 2.5V
2
C232
C207
8)
7%'
C233
C230
8)
8)
DRAWN BY:
DATE:
ENGINEER:
RELEASED BY:
DATE:
TITLE:
UPDATED BY:
DATE:
.,5$1 %(51$5'
.,5$1 %(51$5'
DATE:
,6/0(9$/3+=
C231
8)
C251
8)
C250
TESTER
MASK#
8)
FILENAME:
HRDWR ID
REV.
SHEET
OF
Application Note 1655
VOUTSET
PGND1
ISFETDRV
ISET
EN
13
14
TP34
VSEN_REM-
FSYNC_IN
ISHARE
CLKOUT
12
VOUT
R221_ADJ
PH_CNTRL
(1B%86
3)
R203
FF
39,1
ISHARE_BUS
C211
C254
C253
8)
7%'
7%'
C12
7%'
C25
7%'
C51
3)
))B%86
7%'
R221F 5.0V
R219
,6)(7'59
C212
'13
R223
'13
&/.
RM-2
.
&/.
3
R211
C24
7%'
R217
,6)(7'59
HEADER1
1 12 2
VSENC236
1
'13
2
C001
(1B%86
.
JP201
C19
7%'
R215
*1'
C252
C235
8)
1
C9
PVIN_TP
VCC_GND
1
9287
9&&
2
2
PVIN
8)
VCC
1
VCC_PWR
2
R3
R4
R2
.
J2
'13
))B%86
3
SW11
'13
R1
.
1
8)
C15
2
2
2
C3
39,1
8)
1
J1
AN1655.0
August 18, 2011
Application Note 1655
ISL8200MEVAL1PHZ Bill of Materials
REF DES.
PART NUMBER
ADJ, VCC, 1.2V, 1.5V, 1.8V, 2.5V JUMPER2_100
3.3V, 5.0V, ADJ1, FIXED, JP201
QTY
MANUFACTURER
DESCRIPTION
11
Generic
Two Pin Jumper
1
Panasonic
Capacitor, 2200pF, 10%, 50V, 0603
C12, C25
2
DNP
Capacitor, 0805
C201
1
DNP
Capacitor, 1206
GRM32ER61E226KE15L
3
Murata
Capacitor, 22uF, 10%, 25V, 1210
C204
H1045-00101-50V5
1
Generic
Capacitor, 100pF, 5%, 50V, 0603
C209
GRM21BR71A475KA73
1
Murata
Capacitor, 10µF, 10%, 10V, 0805
C210
GRM21BR71E225KA73L
1
Murata
Capacitor, 2.2µF, 10%, 25V, 0805
C211
H1045-00102-50V10
1
Generic
Capacitor, 1000pF, 10%, 50V, 0603,
3
DNP
Capacitor, 0603
C001
C202, C203, C206
ECJ-1VB1H222K
C212, C235, C236
C230, C232, C250,
C252-C255
C2012X7R1E105K
7
TDK
Capacitor, 1µF, 10%, 25V, 0805
C231, C233, C251
H1046-00104-25V10
3
Generic
Capacitor, 0.1µF, 10%, 25V, 0805
C3225X7R1E106M
1
TDK
Capacitor, 10µF, 20%, 25V, 1210
4
DNP
Capacitor, 1210
C234
C24, C51, C205, C207
C3, C15
35MV270AX
2
Sanyo
Capacitor, 270µF, 20%, 35V, Radial
C9, C19
2TPLF330M7
2
Sanyo
Capacitor, 330µF, 20%, 2V, SMD
HEADER1
TSW-102-07-L-S
1
Generic
2 Pin Header
J1
111-0702-001
1
JOHNSON-COMP
Binding Post (Red)
J2
111-0703-001
1
JOHNSON-COMP
Binding Post (Black)
J4, VOUT
KPA8CTP
2
Burndy
Wire Connector Lug
LED301
SSL-LXA3025IGC
1
Lumex
3.5mmx2.5mm SMD Red/Green LED
2N7002L
1
On-Semi
N-Channel 60V 115mA MOSFET (SOT23)
R1
H2511-08251-1/16W1
1
Generic
Resistor, 8.25kΩ, 1%, 1/16W, 0603
R2
H2511-03011-1/16W1
1
Generic
Resistor, 3.01kΩ, 1%, 1/16W, 0603
R203
H2511-00010-1/10W1
1
Generic
Resistor, 1Ω, 1%, 1/10W, 0603
ERJ3GEY0R00V
3
Panasonic
Resistor, 0Ω, 0%, 1/10W, 0603
H2505-DNP-DNP-R1
4
DNP
Resistor, 0603
H2511-01002-1/10W1
3
Generic
Resistor, 10kΩ, 1%, 1/10W, 0603
3262W-1-203
1
Bourns
Potentiometer, 20kΩ, 10%, 1/4W, RADIAL
R221A
H2505-02201-1/16WR1
1
Generic
Resistor, 2.2kΩ, 0.1%, 1/16W, 0603
R211B
H2511-03321-1/16W1
1
Generic
Resistor, 3.32kΩ, 0.1%, 1/16W, 0603
Q302
R206, RM+2, RM-2
R211, R219, R233, R209A
R215, R217, R221E
R221_ADJ
4
AN1655.0
August 18, 2011
Application Note 1655
ISL8200MEVAL1PHZ Bill of Materials
REF DES.
PART NUMBER
QTY
(Continued)
MANUFACTURER
DESCRIPTION
R221C
H2511-04421-1/16W1
1
Generic
Resistor, 4.42kΩ, 0.1%, 1/16W, 0603
R221D
H2511-06981-1/16W1
1
Generic
Resistor, 6.98kΩ, 0.1%, 1/16W, 0603
R221F
H2511-01622-1/16W1
1
Generic
Resistor, 16.2kΩ, 0.1%, 1/16W, 0603
R240
H2510-06200-1/16W1
1
Generic
Resistor, 620Ω, 1%, 1/16W, 0603
R241
SM-3TW104
1
Copal
Potentiometer, 100kΩ, 20%, 0.125W, SMD
H2505-DNP-DNP-1
2
DNP
Resistor, 0603
H2505-03301-1/16WR1
2
Generic
Resistor, 3.3kΩ, 0.1%, 1/16W, 0603
GT11MSCBE-T
1
C&K
Switch, SPDT Toggle
TP301, VSEN+, VSEN-,
VSEN_PRIME
5002
4
Keystone
Miniature White Test points 0.100 pad with
0.040 t-hole
TP34, TP310, PVIN_TP,
VCC_GND, VDD_PWR
1514-2
5
Keystone
Test point, Turret, 0.150 pads with 0.100 t-hole
ISL8200MIRZ
1
Intersil
Current-Share Capable 10A DC/DC Power
Module
R3, R4
R324, R325
SW1
U1
5
AN1655.0
August 18, 2011
Application Note 1655
ISL8200MEVAL1PHZ Board Layout
FIGURE 3. TOP COMPONENTS
FIGURE 4. TOP LAYER
6
AN1655.0
August 18, 2011
Application Note 1655
ISL8200MEVAL1PHZ Board Layout (Continued)
FIGURE 5. 2nd LAYER
FIGURE 6. 3 rd LAYER
7
AN1655.0
August 18, 2011
Application Note 1655
ISL8200MEVAL1PHZ Board Layout (Continued)
FIGURE 7. BOTTOM LAYER
FIGURE 8. BOTTOM COMPONENTS (MIRRORED)
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
8
AN1655.0
August 18, 2011