an1523

Application Note 1523
Author: Jifeng Qin
ISL78010EVAL1Z Evaluation Board User’s Guide
The ISL78010EVAL1Z evaluation board is used to
demonstrate the performance of the ISL78010 IC used
for automotive grade TFT-LCD power supply solution.
The top side and the bottom side of ISL78010EVAL1Z
are shown in Figures 1 and 2, respectively. This board
consists of power and load connectors for source and
load side, external passive components, and the place
holders reserved for the following applications:
1. Place holder for second stage positive charge pump
for high voltage application at VON rail.
2. Place holder for additional external compensation.
3. Place holder for snubber circuits to improve EMI
performance.
The input voltage range is from 3V to 5V, and the
maximum output voltage on main boost rail is 20V.
Reference Documents
• ISL78010 Data Sheet (FN6501)
Key Features
• 2A current FET
• 3V to 5V input
• Up to 20V boost output
• 1% regulation on boost output
• VLOGIC-VBOOST-VOFF-VON or
VLOGIC-VOFF-VBOOST-VON sequence control
• Programmable sequence delay
• Fully fault protected
• Thermal shutdown
• Internal soft-start
• 32 Ld 5x5 TQFP packages
• Pb-free plus anneal available (RoHS compliant)
Recommended Equipment
The following materials are recommended to perform
testing:
• 0V to 10V Power Supply with at least 5A source
current capability
• Electronic Loads capable of sinking current up to 5A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
FIGURE 1. TOP VIEW OF ISL78010EVAL1Z
Quick Setup Guide
1. Set power source to be 5V and with 0.5A current
limiting.
2. Apply 5V to the input: J1 (VIN+) is input+, J2 (VIN-)
is input-. Check the power source to make sure that
no current limiting occurs.
3. Release the input power source’s current limiting to 5A.
4. Turn off the input power source. Set the electronic
load to constant current load of 100mA, connect the
electronic load to the VBST output: J6 (VBST) is
output+, J8 (PGND) is output-.
5. Turn on the input power source, verify the output
voltage is around 12V for VBST (J6, J8).
6. Verify that the ripple voltage (about 1MHz
frequency) for the VBST voltage is around 50mV.
7. Verify the voltage at VON rail (between J3 and J7) is
20V.
8. Verify the voltage at VLOGIC rail (between J4 and J7)
is 2.5V.
FIGURE 2. BOTTOM VIEW OF ISL78010EVAL1Z
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9. Verify the voltage at VOFF rail (between J5 and J7),
is -8V.
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. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
Application Note 1523
Quick Start to Measure the
Boost Output Voltage
The evaluation board can be evaluated simply. Figure 3
shows the quick configuration to measure the boost
rail output voltage. After powering on the input power
supply, the oscilloscope probes can be placed at VBST
pin to check the output voltage, and at LX pin to check
the phase node voltage.
FIGURE 4. EFFICIENCY MEASUREMENT SET UP
Output Ripple/Noise
Measurement
FIGURE 3. QUICK SET UP TO MEASURE THE VBST
VOLTAGE
Efficiency Measurement
Figure 4 shows the efficiency measurement set up for the
ISL78010EVAL1Z Eval Board. 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.
The total noise is equal to the sum of the ripple and
noise components. Simple steps should be taken to
assure that there is minimum pickup noise due to the
high frequency events, which can be magnified by the
large ground loop formed by the oscilloscope probe
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 5. For ISL78010EVAL1Z evaluation board, the
output ripple/noise measurement point is located at
the C9 terminal.
The efficiency equation is shown in Equation 1:
( V OUT • I OUT )
P OUT
Output Power
Efficiency = ------------------------------------ = ---------------- = ---------------------------------------P IN
( V IN • I IN )
Input Power
(EQ. 1)
As shown in Figure 4, the measuring point for the input
voltage meter is at the C10 terminal, and the measuring
point for the output voltage meter is at the C9 terminal.
FIGURE 5. OUTPUT RIPPLE/NOISE MEASUREMENT
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ISL78010EVAL1Z Eval Board Application Diagram
3
Application Note 1523
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Application Note 1523
ISL78010EVAL1Z Eval Board Bill of Materials (BOM)
DEVICE #
DESCRIPTION
Cp, C0, C8
CAP, SMD, 0603, 1000pF, 16V, 10%, X7R,
RoHS
VENKEL
C0603X7R160102KNE
TDK
C1608X7R1H104K
CAP, SMD, 0603, 1800pF, 50V, 10%, X7R,
RoHS
MURATA
GRM39X7R182K050AQ
CAP, SMD, 0603, 220pF, 50V, 10%, X7R,
RoHS
MURATA
GRM188R71H221KA01D
CAP, SMD, 0603, 0.022µF, 25V, 10%, X7R,
RoHS
MURATA
GRM39X7R223K025AQ
CAP, SMD, 0603, 0.22µF, 16V, 10%, X7R,
RoHS
TDK
C1608X7R1C224K
CAP, SMD, 0805, 4.7µF, 16V, 10%, X5R,
RoHS
MURATA
GRM21BR61C475KA88L
C9, C11, C12, C14, C22, C24, CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R,
C25, C41
RoHS
C23
C4
C16
C7
C6, C10
C1, C2, C3
MANUFACTURER
PART NUMBER
MANUFACTURER
CAP, SMD, 1206, 10µF, 25V, 10%, X5R, RoHS VENKEL
C1206X5R250-106KNE
C20
CAP, SMD, 1206, 0.47µF, 25V, 10%, X7R,
RoHS
PANASONIC
ECJ-3YB1E474K
C31
CAP, SMD, 1206, 4.7µF, 16V, 10%, X7R,
RoHS
MURATA
GRM31CR71C475KA01L
C15
CAP, SMD, 1210, 1µF, 50V, 10%, X7R, RoHS VENKEL
C1210X7R500-105KNE
COIL-PWR INDUCTOR, SMD, 7.3X6.8mm,
6.8µH, 20%, 2.8A, RoHS
TDK
RLF7030T-6R8M2R8
CONN-TURRET, TERMINAL POST, TH, RoHS
KEYSTONE
1514-2
L1
J1-J8
TP1-TP3
CONN-MINI TEST POINT, VERTICAL, WHITE, KEYSTONE
RoHS
5002
DIODE-SCHOTTKY, SMD, SOT23, 3P, 30V,
200mA, DUAL DIODE
FAIRCHILD
BAT54S
D1
DIODE-SCHOTTKY, SMD, POWERMITE, 20V,
1A, RoHS
ON SEMI
MBRM120ET1G
U1
IC-TFT-LCD POWER SUPPLY, 32P, TQFP, 5x5, INTERSIL
RoHS
ISL78010ANZ
Q1
TRANSIST-MOS, P-CHANNEL, SMD,
SUPERSOT3, -20V, -2.4A, RoHS
FAIRCHILD
FDN304P
Q2
TRANSISTOR-NPN, SMD, SOT-23, 40V,
200mA, 350mW, RoHS
FAIRCHILD
MMBT3904
Q3
TRANSISTOR-PNP, SMD, SOT-23, 40V,
200mA, 350mW, RoHS
FAIRCHILD
MMBT3906
Q4
TRANSIST-MOS, P-CHANNEL, SMD,
SUPERSOT3, -30V, -2A, RoHS
FAIRCHILD
FDN360P
Q5
TRANSISTOR, PNP, SMD, SOT23, -30V, -1A,
500mW, RoHS
FAIRCHILD
FMMT549
R102, R104
RES, SMD, 0603, 1Ω, 1/10W, 1%, TF, RoHS
VENKEL
CR0603-10W-1R00FT
RES, SMD, 0603, 10Ω, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-10R0FT
RES, SMD, 0603, 0Ω, 1/10W, TF, RoHS
CR0603-10W-000T
D11, D21
R6
R10, R14, R101, R111
R7, R8
R9
4
VENKEL
RES, SMD, 0603, 10k, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-1002FT
RES, SMD, 0603, 1M, 1/10W, 1%, TF, RoHS
CR0603-10W-1004FT
VENKEL
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Application Note 1523
ISL78010EVAL1Z Eval Board Bill of Materials (BOM) (Continued)
DEVICE #
DESCRIPTION
MANUFACTURER
MANUFACTURER
PART NUMBER
R22
RES, SMD, 0603, 165k, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-1653FT
R11, R21, R41
RES, SMD, 0603, 20k, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-2002FT
R42
RES, SMD, 0603, 21.5k, 1/10W, 1%, TF,
RoHS
VENKEL
9C06031A2152FKHFT
R23
RES, SMD, 0603, 3.01k, 1/10W, 1%, TF,
RoHS
VENKEL
CR0603-10W-3011FT
R12
RES, SMD, 0603, 316k, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-3163FT
RES, SMD, 0603, 46.4k, 1/10W, 1%, TF,
RoHS
VENKEL
CR0603-10W-4642FT
RES, SMD, 0603, 499Ω, 1/10W, 1%, TF, RoHS VENKEL
CR0603-10W-4990FT
R1
RES, SMD, 0603, 4.99k, 1/10W, 1%, TF,
RoHS
VENKEL
CR0603-10W-4991FT
R13
RES, SMD, 0603, 6.98k, 1/10W, 1%, TF,
RoHS
VENKEL
CR0603-10W-6981FT
R4
RES, SMD, 0603, 75.0k, 1/10W, 1%, TF,
RoHS
VENKEL
CR0603-10W-7502FT
BUMPONS, 0.44inW x 0.20inH, DOMETOP,
BLACK
3M
SJ-5003SPBL
BAG, STATIC, 5x8, ZIP LOC
INTERSIL
212403-013
R2
R43
Bottom four corners.
Place assy in bag.
CS1, C5, C13, C42, C102,
C103
Do Not Populate Or Purchase (DNP)
D12
Do Not Populate Or Purchase (DNP)
Q111
Do Not Populate Or Purchase (DNP)
RS1, R5, R100, R103, R105, Do Not Populate Or Purchase (DNP)
R114
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Application Note 1523
ISL78010EVAL1Z Board Layout
FIGURE 6. TOP COMPONENTS
FIGURE 7. TOP LAYER ETCH
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Application Note 1523
ISL78010EVAL1Z Board Layout (Continued)
FIGURE 8. BOTTOM LAYER COMPONENTS (MIRROR)
FIGURE 9. BOTTOM LAYER ETCH (MIRROR)
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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