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ADP1613ARMZ-R7 数据表(PDF) 14 Page - Analog Devices

部件名 ADP1613ARMZ-R7
功能描述  650 kHz /1.3 MHz Step-Up PWM DC-to-DC Switching Converters
PDF  28 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADP1613ARMZ-R7 数据表(HTML) 14 Page - Analog Devices

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ADP1612/ADP1613
Rev. A | Page 14 of 28
The output capacitor maintains the output voltage and supplies
current to the load while the ADP1612/ADP1613 switch is on.
The value and characteristics of the output capacitor greatly
affect the output voltage ripple and stability of the regulator. A
low ESR ceramic dielectric capacitor is preferred. The output
voltage ripple (ΔVOUT) is calculated as follows:
OUT
ON
L
OUT
C
OUT
C
t
I
C
Q
V
×
=
=
Δ
(8)
where:
QC is the charge removed from the capacitor.
tON is the on time of the switch.
COUT is the output capacitance.
IL is the average inductor current.
SW
ON
f
D
t
=
(9)
and
OUT
IN
OUT
V
V
V
D
−
=
(10)
Choose the output capacitor based on the following equation:
OUT
OUT
SW
IN
OUT
L
OUT
V
V
f
V
V
I
C
Δ
×
×
−
×
≥
)
(
(11)
Multilayer ceramic capacitors are recommended for this
application.
DIODE SELECTION
The output rectifier conducts the inductor current to the output
capacitor and load while the switch is off. For high efficiency,
minimize the forward voltage drop of the diode. For this reason,
Schottky rectifiers are recommended. However, for high voltage,
high temperature applications, where the Schottky rectifier
reverse leakage current becomes significant and can degrade
efficiency, use an ultrafast junction diode.
Ensure that the diode is rated to handle the average output
load current. Many diode manufacturers derate the current
capability of the diode as a function of the duty cycle. Verify
that the output diode is rated to handle the average output
load current with the minimum duty cycle. The minimum
duty cycle of the ADP1612/ADP1613 is
OUT
MAX
IN
OUT
MIN
V
V
V
D
)
(
−
=
(12)
where VIN(MAX) is the maximum input voltage.
The following are suggested Schottky diode manufacturers:
•
ON Semiconductor
•
Diodes, Inc.
LOOP COMPENSATION
The ADP1612/ADP1613 use external components to
compensate the regulator loop, allowing optimization of
the loop dynamics for a given application.
The step-up converter produces an undesirable right-half plane
zero in the regulation feedback loop. This requires compensating
the regulator such that the crossover frequency occurs well
below the frequency of the right-half plane zero. The right-
half plane zero is determined by the following equation:
L
R
V
V
RHP
F
LOAD
OUT
IN
Z
×
π
×
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
=
2
)
(
2
(13)
where:
FZ(RHP) is the right-half plane zero.
RLOAD is the equivalent load resistance or the output voltage
divided by the load current.
To stabilize the regulator, ensure that the regulator crossover
frequency is less than or equal to one-fifth of the right-half
plane zero.
The regulator loop gain is
OUT
CS
COMP
MEA
OUT
IN
OUT
FB
VL
Z
G
Z
G
V
V
V
V
A
×
×
×
×
×
=
(14)
where:
AVL is the loop gain.
VFB is the feedback regulation voltage, 1.235 V.
VOUT is the regulated output voltage.
VIN is the input voltage.
GMEA is the error amplifier transconductance gain.
ZCOMP is the impedance of the series RC network from COMP
to GND.
GCS is the current sense transconductance gain (the inductor
current divided by the voltage at COMP), which is internally
set by the ADP1612/ADP1613.
ZOUT is the impedance of the load and output capacitor.



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