User Guide 113
UG113.0
February 15, 2017
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2
Connector and Test Point
Descriptions
The ISL85014EVAL1Z evaluation board includes I/O connectors
and test points as shown in
Table 1
.
Selection Switch and Jumper
Descriptions
• Switch SW5 (Enable)
The switch enables and disables the ISL85014:
- When the switch is in the ON position, the ISL85014 is
enabled.
- When the switch is in the OFF position, the ISL85014 is
disabled.
• Jumper J9
The jumper provides the selection of different operating
modes, detailed as follows:
- When the jumper is in the FCCM position, the ISL85014
operates in Forced CCM.
- When the jumper is in the DEM position, the ISL85014
operates in Diode Emulation mode and enables automatic
transition from CCM to DCM at light-load conditions.
• Jumper J10 sets the switching frequency at either 600kHz or
300kHz.
• Jumper J11 sets the OCP scheme in either Hiccup mode or
Latch-Off mode.
Quick Setup Guide
Refer to the following instructions to configure and power-up the
board for proper operation.
1. Set the power supply voltage to 12V and turn off the power
supply. Connect the positive output of the power supply to J1
(PVIN) and the negative output to J3 (GND).
2. Connect an electronic load to J2 (VOUT) for the positive
connection and J4 (GND) for the negative connection.
3. Measure the output voltage (test points VOUT and GND) with
the voltmeter.
4. Place scope probes on VOUT test point (J7) and other test
points of interest.
5. Toggle selection switch SW5 to ON position.
6. Set the load current to 0.1A and turn on the power supply. The
output voltage should be in regulation with a nominal 1.8V
output.
7. Slowly increase the load up to 14A while monitoring the
output voltage, which should remain in regulation with a
nominal 1.8V output.
8. Slowly sweep VIN from 4.5V to 18V. The output voltage should
remain in regulation with a nominal 1.8V output.
9. Decrease the input voltage to 0V to shut down the regulator.
Frequency Synchronization
The ISL85014 can be synchronized to an external clock with
frequency ranges from 100kHz to 1MHz by applying the external
clock to test point SYNC on the ISL85014EVAL1Z evaluation
board. The external clock should meet the specifications of pulse
width and voltage level described in the
ISL85014
datasheet.
Evaluating Other Output
Voltages
The ISL85014EVAL1Z has a nominal 1.8V output voltage. The
output voltage is programmable by an external resistor divider
formed by R
1
and R
2
as shown in
Figure 1
on
page 1
. R
1
is
usually chosen first, then the value for R
2
can be calculated
based on R
1
and the desired output voltage using
Equation 1
:
TABLE 1. CONNECTORS AND TEST POINTS
REFERENCE
DESIGNATOR
DESCRIPTION
J1
Input voltage positive connection
J2
Output voltage positive connection
J3
Input voltage return connection
J4
Output voltage return connection
J6
Two-position socket connector for PHASE to GND test
J7
Two-position socket connector for VOUT to GND test
PVIN
PVIN positive test point
GND
GND test point
VIN
VIN positive test point
VOUT
Output voltage positive test point
SYNC
External synchronization clock connection
EN
Enable test point
VDD
Internal LDO output test point
PG
Power-good output
R
2
R
1
0.6V
V
OUT
0.6V
–
----------------------------------
=
(EQ. 1)
