Datasheet
EVAL-ADP2114
Rev. 0 | Page 5 of 20
Changing the Output Voltages
The output voltages set points of the converter can be changed
by replacing Resistor R15, Resistor R16, Resistor R17, and
Resistor R18 with the resistor values shown in Table 3.
In addition, when the adjustable output voltage version is used
for the ADP2114, the output voltage, V
OUT1
, is set by the resis-
tive voltage divider R5/R6 and the output voltage, V
OUT2
, is set
by the resistive voltage divider R11/R12.
To calculate the desired resistor values, first determine the value
of the bottom divider string resistor, R6 (R12 for Channel 2),
by ensuring that the divider string current, I
STRING
, is greater
than 20 μA.
For Channel 1,
R6 = 0.6 V/I
STRING
(3)
For Channel 2,
R12 = 0.6 V/I
STRING
(4)
Then calculate the value of the top resistor, R5 (R11 for Channel 2).
For Channel 1,
V6.0
V6.0
1OUT
V
R6R5 (5)
For Channel 2,
V6.0
V6.0
2OUT
V
R12R11 (6)
Note that when the output voltage of Channel 1, V
OUT1
, is changed,
to ensure stable operation, the values of Inductor L1, the C13
and C14 output capacitors, and the R2 and C2 compensation
components must be recalculated and changed (see the ADP2114
data sheet for details on external component selection). If the
output voltage of Channel 2, V
OUT2
, is changed, the values of the
Inductor L2, the C15 and C16 output capacitors, and the R4 and
C4 compensation components must be recalculated and changed.
Changing the Switching Frequency
The switching frequency (f
SW
) set point can be changed by replac-
ing Resistor R19 with a different value, as shown in Table 2.
Table 2. Setting the Switching Frequency, f
SW
R19 (Ω) ± 5% Switching Frequency, f
SW
(kHz)
0 300
8.2 k 600
27 k 1200
Note that when the switching frequency (f
SW
) is changed, to
ensure stable operation, the values of the Inductor L1 and
Inductor L2, the C13, C14, C15, and C16 output capacitors, and
the R2, C2, R4, and C4 compensation components must be
recalculated and changed (see the ADP2114 data sheet for
details on external component selection).
Changing the Soft Start Time
The soft start time of the ADP2114 on the evaluation board is
programmed to 1 ms.
To change the soft start time, t
SS
, replace Capacitor C7 (C9 for
Channel 2) with a different capacitor value using the following:
For Channel 1,
C7 [nF] = 10 × t
SS
[ms] (7)
For Channel2,
C9 [nF] = 10× t
SS
[ms] (8)
Combining the Two Channels into a Single Output
For a single, interleaved dual-phase output, make the following
modifications:
Short the outputs, +VOUT1 and +VOUT2, by soldering
the bridge on CB3
Tie the EN1 and EN2 signals by shorting CB1
Tie the PGOOD1 and PGOOD2 signals by shorting CB2
Tie the FB1 and FB2 signals by shorting CB4
Tie the COMP1 and COMP2 signals by shorting CB5
Set the same output voltages of both channels by choosing
R15 = R17 and R16 = R18
Choose and set the operating mode to 2 A/2 A, forced
PWM configuration, by setting R14 to 4.7 kΩ.
The evaluation board version ADP2114-2PH-EVALZ is already
configured for interleaved dual-phase single output, 1.2 V at
4 A, 1.2 MHz switching frequency, and forced PWM mode.
Table 3. Programming the Output Voltages
R15 (Ω) ± 5% R16 (Ω) ± 5% V
OUT1
(V) R17 (Ω) ± 5% R18 (Ω) ± 5% V
OUT2
(V)
Open 0 0.8 Open 0 0.8
Open 4.7 k 1.2 Open 4.7 k 1.2
Open 8.2 k 1.5 Open 8.2 k 1.5
Open 15 k 1.8 Open 15 k 1.8
Open 27 k 2.5 Open 27 k 2.5
Open 47 k 3.3 Open 47 k 3.3
Open 82 k Adjustable 0.6 to <1.6 Open 82 k Adjustable 0.6 to <1.6
0 Open Adjustable 1.6 to 3.3 0 Open Adjustable 1.6 to 3.3