Datasheet

Evaluation Board User Guide UG-310
Rev. 0 | Page 3 of 12
USING THE EVALUATION BOARD
POWERING UP
The ADP2323 evaluation board is supplied fully assembled and
tested. Before applying power to the evaluation board, follow the
procedures in this section.
Jumper J31/Jumper J32 (Enable)
Jumper J31 is used to control Channel 1. Use one of the following
methods to enable or to disable Channel 1:
• To enable Channel 1, short the middle pin of J31, EN1, to
high or leave it open.
• To disable Channel 1, short the middle pin of J31, EN1, to
low and remove R2.
Jumper J32 is used to control Channel 2. Use one of the following
methods to enable or disable Channel 2:
• To enable Channel 2, short the middle pin of J32, EN2, to
high or leave it open.
• To disable Channel 2, short the middle pin of J32, EN2, to
low and remove R16.
Jumper J4/Jumper J22 (TRACK)
When the tracking function is not used, short the middle pin of
J4, TRK1, and J22, TRK2, to high.
Jumper J19 (MODE)
Jumper J19 is used to select the working mode of the ADP2323.
Use one of the following methods to set the regulator to operate
in PWM or PFM mode.
• To operate in PWM mode, short the middle pin of J19 to high.
• To operate in PFM mode, short the middle pin of J19 to low.
Jumper J7 (SCFG)
Jumper J7 is used to configure the SYNC pin as an input or an
output. Short the middle pin of J7 to high to set the SYNC pin
as an output. To sync the regulator to an external clock, set the
SYNC pin as an input.
External Synchronization
To synchronize the regulator to an external clock, refer to Table 1
for proper configuration of the SCFG pin and the SYNC pin.
Table 1. SCFG Configuration
J7 (SCFG) R3 SYNC Phase Shift
High No connect Output 0°
Low No connect Input 90°
Open 180 kΩ Input 120°
Open 100 kΩ Input 60°
When the SYNC pin is configured as an output, it generates a clock
with a frequency that is equal to the internal switching frequency.
When the SYNC pin is configured as an input, the ADP2323
synchronizes to an external clock applied to the SYNC pin, and the
internal clock must be programmed lower than the external clock.
When operating in synchronization mode, PFM mode is disabled,
and the ADP2323 only operates in continuous conduction
mode (CCM) mode.
Input Power Source
If the input power source includes a current meter, use that meter
to monitor the input current. Connect the positive terminal of
the power source to J1 and J23 (PVIN1 and PVIN2, respectively) of
the evaluation board, and the negative terminal of the power
source to J3 and J27 (GND) of the evaluation board.
If the power source does not include a current meter, connect a
current meter in series with the input source voltage. Connect the
positive lead (+) of the power source to the positive (+) ammeter
terminal, the negative lead (−) of the power source to J3 and J27
(GND), and the negative lead (−) of the ammeter to J1 and J23
(PVIN1 and PVIN2, respectively).
Output Load
Before connecting the load, ensure that the board is turned off.
Connect an electronic load or resistor to set the load current.
To connect a load to the output of Channel 1, connect the
positive terminal of the load to J8 (VOUT1) of the evaluation
board and connect the negative terminal of the load to J10 (GND).
To connect a load to the output of Channel 2, connect the
positive terminal of the load to J20 (VOUT2) of the evaluation
board and connect the negative terminal of the load to J17 (GND).
Input and Output Voltmeter
Measure the input and output voltages using voltmeters. Make
sure that the voltmeters are connected to the appropriate terminals
of evaluation board and not to the load or power source. If the
voltmeters are not connected directly to the evaluation board,
the measured voltages are incorrect due to the voltage drop across
the leads and/or connections between the evaluation board, the
power source, and/or the load.
To measure the input voltage, connect the positive terminal of
the voltmeter to J2 (PVIN1_SNS) or J24 (PVIN2_SNS) and the
negative terminal to J5 or J30 (GND_SNS). Likewise, to measure
the output voltage, connect the positive terminal of the voltmeter
to J9 (VOUT1_SNS) or J18 or (VOUT2_SNS) and the negative
terminal to J12 or J14 (GND_SNS).