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ADP5076ACBZ-R7 Datasheet(PDF) 18 Page - Analog Devices

Part # ADP5076ACBZ-R7
Description  2 A/1.2 A DC-to-DC Switching Regulator with Independent Positive and Negative Outputs
PDF  23 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP5076ACBZ-R7 Datasheet(HTML) 18 Page - Analog Devices

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ADP5076
Data Sheet
Rev. A | Page 18 of 23
The dc input current in CCM (IIN) can be determined using the
following equation:
(1
)
OUT1
IN
1
I
I
DUTY
Using the DUTY1 and fSW, determine the on time (tON1) using
the following equation:
1
ON1
SW
DUTY
t
f
The inductor ripple current (IL1) in steady state is calculated
using the following equation:
INON1
L1
Vt
I
L1

Solve for the inductor (L1) using the following equation:
INON1
L1
Vt
L1
I
Assuming an inductor ripple current of 30% of the maximum
dc input current, solve for L1 using the following equation:
(1
)
0.3
1
IN
ON1
OUT1
Vt
DUTY
L1
I
 
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, ensure that the
maximum rated rms current of the inductor is greater than the
maximum dc input current to the regulator.
When the ADP5076 boost regulator is operated in CCM at duty
cycles greater than 50%, slope compensation is required to stabilize
the current mode loop. This slope compensation is built in to
the ADP5076. For stable current mode operation, ensure that
the selected inductance is equal to or greater than the minimum
calculated inductance (LMIN1) for the application parameters in
the following equation:

0.13
0.16
(
µH
1)
MIN1
IN
1
L1 L
V
DUTY




Table 11 suggests a series of inductors to use with the ADP5076
boost regulator.
Inductor Selection for the Inverting Regulator
The inductor 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 tradeoffs
between small inductor current ripple and efficiency, inductance
values in the range of 1 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 results in a higher peak current that can lead
to reduced efficiency and greater input and/or output ripple and
noise. A peak-to-peak inductor ripple current that is close to
30% of the maximum dc current in the inductor typically yields
an optimal compromise.
For the inductor ripple current in CCM operation, the VIN and
output voltage (VNEG) determine the switch duty cycle (DUTY2)
using the following equation:
DIODE2
NEG
IN
DIODE2
NEG
2
V
V
V
V
V
DUTY
|
|
|
|
where VDIODE2 is the forward voltage drop of D2.
The dc current in the inductor in CCM (IL2) can be determined
using the following equation:
(1
)
OUT2
L2
2
I
I
DUTY
Using the DUTY2 and fSW, determine the on time (tON2) using
the following equation:
2
ON2
SW
DUTY
t
f
The inductor ripple current (IL2) in steady state is calculated
using the following equation:
INON2
L2
Vt
I
L2

Solve for the inductor (L2) using the following equation:
INON2
L2
Vt
L2
I
Assuming an inductor ripple current of 30% of the maximum
dc current in the inductor, solve for L2 using the following
equation:
(1
)
0.3
2
IN
ON2
OUT2
Vt
DUTY
L2
I
 
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, ensure that the maximum rated
rms current of the inductor is greater than the maximum dc
input current to the regulator.
When the ADP5076 inverting regulator is operated in CCM at
duty cycles greater than 50%, slope compensation is required to
stabilize the current mode loop. For stable current mode operation,
ensure that the selected inductance is equal to or greater than
the minimum calculated inductance (LMIN2) for the application
parameters in the following equation:

0.13
0.16
(
µH
1)
MIN2
IN
2
L2 L
V
DUTY




Table 12 suggests a series of inductors to use with the ADP5076
inverting regulator.
LOOP COMPENSATION
The ADP5076 uses external components to compensate the
regulator loop, allowing the optimization of the loop dynamics
for a given application.



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