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ADP5055-EVALZ
EVALUATION BOARD HARDWARE
The ADP5055-EVALZ is fully assembled and tested. Before
applying power to the ADP5055-EVALZ, follow the procedures
in this section.
ENABLE JUMPERS
Each channel has an enable pin (ENx) that must be pulled high
to enable that channel (see Table 1). Pull the ENx pin low or
leave it floating to disable the channel.
The enable control for each regulator has a 0.615 V precision
enable threshold, which allows the
between channels or other input and output supplies.
Table 1. Enable Pin Channels
Channel Number
Channel 1
Channel 2
Channel 3
POWER INPUT JUMPERS
Each channel has its own power input jumper, which supports
separate input voltages or cascaded options for all channels.
The bias input voltage range for the three buck regulators is 4.5 V
to 18 V. If separate power supplies are used for PVIN1 and VBIAS
with R35 removed (on the ADP5055-EVALZ, PVIN1 and VBIAS
are connected together through the R35, 0 Ω resistor by default),
the wide input voltage range for the three buck regulators is 2.75 V
to 18 V. The S1 and S2 shunts allow easy setup by using the same
input voltages for the three buck regulators. See Table 2 for the
power input details.
Table 2. Power Input Pin Channels
Channel
Number
Mnemonic
Channel 1
PVIN1
Channel 2
PVIN2
Channel 3
PVIN3
J_SYNC JUMPER (SYNC/MODE)
The J_SYNC jumper, as shown in Figure 1, is used to connect
the SYNC/MODE pin of the device to either low (GND) or high
(VREG).
1.
Shunt the center contact of J_SYNC (SYNC_MODE) to the
top pin header, which pulls the SYNC/MODE pin high to
VREG (4.8 V) to allow the three buck regulators into forced
pulse-width modulation (FPWM) operation.
2.
Shunt the center contact of J_SYNC to the bottom pin
header, which pulls the SYNC/MODE pin low to force the
three buck regulators to operate in automatic pulse-width
modulation/power saving mode (PWM/PSM) operation.
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ADP5055
to be sequenced
Mnemonic
Enable Jumpers
EN1
J-EN1
EN2
J-EN2
EN3
J-EN3
Input Jumper
Input Range (V)
J11
4.5 to 18
S1
4.5 to 18
S2
4.5 to 18
INPUT POWER SOURCE
Use the following steps to connect the ADP5055-EVALZ to the
input power source:
1.
Ensure that the ADP5055-EVALZ is disabled by connecting
the enable jumpers (J-EN1 to J-EN3) to the low position
before connecting the power source to the ADP5055-EVALZ.
2.
If the input power source includes a current meter, use the
meter to monitor the input current.
3.
Connect the positive terminal of the power source to the
PVIN1 terminal (J11) on the ADP5055-EVALZ and
connect the negative terminal of the power source to the
GND terminal (J12) of the ADP5055-EVALZ.
4.
If the power source does not include a current meter, connect
a current meter in series with the input source voltage.
5.
Connect the positive terminal of the power source to the
positive lead of the current meter, the negative terminal of the
power source to the GND terminal (J12) on the ADP5055-
EVALZ, and the negative lead of the current meter to the
PVIN1 terminal (J11) on the ADP5055-EVALZ.
OUTPUT LOAD
Use the following steps to connect the ADP5055-EVALZ to the
output load:
1.
Ensure that the ADP5055-EVALZ is off before connecting
the load.
2.
Connect an electronic load or resistor to set the load current.
If the load includes an ammeter, or if the current is not
measured, connect the load directly to the ADP5055-
EVALZ with the positive load connected to one of the
channels. For example, connect the positive load terminal
to the Channel 1 buck regulator output, J14 (VOUT1) and
connect the negative load terminal to J13 (GND).
3.
If an ammeter is used, connect it in series with the load.
4.
Connect the positive ammeter terminal to the Channel 1
buck regulator output, J14 (VOUT1), connect the negative
ammeter terminal to the positive load terminal, and
connect the negative load terminal to J13 (GND).
Rev. 0 | Page 3 of 16
UG-1930
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