Renesas ISL78010EVAL1Z User Manual
USER’S MANUAL
FIGURE 1. TOP VIEW OF ISL78010EVAL1Z
FIGURE 2. BOTTOM VIEW OF ISL78010EVAL1Z
ISL78010EVAL1Z
Evaluation Board
The ISL78010EVAL1Z evaluation board is u s e d to
demonstrate the performance of the ISL78010 IC used
for automotive grade TFT -L CD 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 ap plications:
1. Place holder for second stage positive charge pump
for high voltage application at V
2. Place holder for additional external compensation.
3. Place holder for snubber circuits to improve EMI
performance.
ON
rail.
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Rev 0.00
January 14, 2010
Reference Documents
• ISL 78010 Data Sheet (FN6501)
Key Features
• 2A current FET
•3V to 5V input
• Up to 20V boost output
• 1% regulation on boost output
•V
LOGIC-VBOOST-VOFF-VON
V
LOGIC-VOFF-VBOOST-VON
• Programmable sequence delay
• Fully fault protected
• Thermal shutdown
• Internal soft-start
• 32 Ld 5x5 TQFP packages
• Pb-free plus anneal available (RoHS compliant)
or
sequence control
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 curr ent u p to 5A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
The input voltage range is from 3V to 5V, and the
maximum output voltage on main boost rail is 20V.
Quick Setup Guide
1. Set power source to be 5V and with 0.5A current
limiting.
2. Apply 5V to the input: J1 (V
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 V
output+, J8 (PGND) is output-.
5. Turn on the input power source, verify the output
voltage is around 12V for V
6. Verify that the ripple voltage (about 1MHz
frequency) for the V
7. Verify the v oltage at V
20V.
8. Verify the voltage at V
is 2.5V.
9. Verify the voltage at V
is -8V.
BST
voltage is around 50mV.
BST
ON
LOGIC
OFF
) is input+, J2 (V
IN+
output: J6 (V
(J6, J8).
BST
rail (between J3 and J7) is
rail (between J4 and J7)
rail (between J5 and J7),
BST
IN-
) is
)
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ISL78010EVAL1Z
FIGURE 3. QUICK SET UP TO MEASURE THE V
BST
VOLTAGE
Efficiency
Output Power
In p u t Power
------------------------------------
P
OUT
P
IN
----------------
V
OUTIOUT
V
INIIN
----------------------------------------
===
(EQ. 1)
FIGURE 4. EFFICIENCY MEASUREMENT SET UP
FIGURE 5. OUTPUT RIPPLE/NOISE MEASUREMENT
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 V
BST
pin to check the output voltage, and at LX pin to check
the phase node 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.
Output Ripple/Noise
Measurement
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
terminal.
the C
9
The efficiency equation is shown in Equation 1:
As shown in Figure 4, the measuring point for the input
voltage meter is at the C
terminal, and the measuring
10
point for the output voltage meter is at the C9 terminal.
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January 14, 2010
ISL78010EVAL1Z
ISL78010EVAL1Z Eval Board Application Diagram
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