ADP1614-1.3-EVALZ Analog Devices, ADP1614-1.3-EVALZ Datasheet - Page 12

• Manufacturer Part Number: ADP1614-1.3-EVALZ
• Description: Power Management IC Development Tools Eval Board 1.3 MHz Switching Freq
• Manufacturer: Analog Devices
• Type: DC/DC Converters, Regulators & Controllersr
• Series: ADP1614r

Specifications of ADP1614-1.3-EVALZ

• Rohs: yes
• Tool Is For Evaluation Of: ADP1614
• Input Voltage: 2.5 V to 5.5 V
• Factory Pack Quantity: 1

ADP1614
APPLICATIONS INFORMATION
ADIsimPower DESIGN TOOL
The
ADIsimPower is a collection of tools that produce complete
power designs that are optimized for a specific design goal. The
tools enable the user to generate a full schematic and bill of
materials and to calculate performance in minutes. ADIsimPower
can optimize designs for cost, area, efficiency, and parts count
while taking into consideration the operating conditions and
limitations of the IC and the external components. For more
information about the ADIsimPower design tools, visit
www.analog.com/ADIsimPower. The toolset is available from
this website, and users can request an unpopulated board.
SETTING THE OUTPUT VOLTAGE
The
to 20 V. The output voltage is set by the resistor voltage divider,
R1 and R2 (see Figure 25), from the output voltage (V
1.245 V feedback input at FB. Use the following equation to
determine the output voltage:
Choose R1 based on the following equation:
INDUCTOR SELECTION
The inductor is an essential part of the step-up switching
converter. It stores energy during the on time of the power
switch and transfers that energy to the output through the
output rectifier during the off time. To balance the trade-offs
between small inductor current ripple and efficiency, induc-
tance values in the range of 4.7 µH to 22 µH are recommended.
In general, lower inductance values have higher saturation
current and lower series resistance for a given physical size.
However, lower inductance values result in higher peak current,
which can lead to reduced efficiency and greater input and/or
output ripple and noise. A peak-to-peak inductor ripple current
close to 30% of the maximum dc input current typically yields
an optimal compromise.
For determining the inductor ripple current in continuous
operation, the input (V
the switch duty cycle (D) as follows:
ADP1614
ADP1614
V
R1
D
OUT
=
=
V
= 1.245 × (1 + R1/R2)
R2
OUT
V
×
is supported by the ADIsimPower™ design toolset.
OUT
features an adjustable output voltage range of V



−
V
V
OUT
IN
. 1
245
−
IN
. 1
) and output (V
245



OUT
) voltages determine
OUT
) to the
Rev. 0 | Page 12 of 16
(1)
(2)
(3)
IN
The duty cycle and switching frequency (f
determine the on time:
The inductor ripple current (∆I
Solve for the inductance value (L) as follows:
Ensure that the peak inductor current (the maximum input
current plus half the inductor ripple current) is below the rated
saturation current of the inductor. Likewise, make sure that the
maximum rated rms current of the inductor is greater than the
maximum dc input current to the regulator.
For continuous current-mode (CCM) duty cycles greater than
50% that occur with input voltages less than one-half the output
voltage, slope compensation is required to maintain stability of
the current-mode regulator. For stable current-mode operation,
ensure that the selected inductance is equal to or greater than
the minimum calculated inductance, L
parameters in the following equation:
Inductors smaller than the 4.7 µH to 22 µH recommended
range can be used as long as Equation 7 is satisfied for the given
application. For input/output combinations that approach the
90% maximum duty cycle, doubling the inductor is recom-
mended to ensure stable operation. Table 5 suggests a series
of inductors for use with the ADP1614.
Table 5. Suggested Inductors
Manufacturer
Coilcraft
TOKO Inc.
Würth Elektronik
Vishay Dale
TDK Components
Taiyo Yuden
t
L
∆
L
ON
I
=
>
L
V
L
=
=
MIN
IN
V
f
∆
D
SW
IN
×
I
=
L
t
×
L
(
ON
V
t
OUT
ON
8
Part Series
XAL40xx, XAL50xx, XAL6060, DO3316P
FDV06xx, DG6045C, FDSD0630, DEM8045C,
FDVE1040
WE-HCI, WE-TPC, WE-PD, WE-PD2, WE -PDF
IHLP-2020, IHLP-2525, IHLP-3232, IHLP-4040
SPM6530, VLP8040, VLF10040, VLF10045
NRS8030, NRS8040
×
−
2
f
SW
×
V
IN
)
L
) in steady state is calculated by
MIN
, for the application
SW
) can be used to
Data Sheet
(4)
(5)
(6)
(7)