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MAX5033DASA Datasheet(PDF) 11 Page - Maxim Integrated Products

Part # MAX5033DASA
Description  500mA, 76V, High-Efficiency, MAXPower Step-Down DC-DC Converter
Download  17 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX5033DASA Datasheet(HTML) 11 Page - Maxim Integrated Products

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500mA, 76V, High-Efficiency, MAXPower
Step-Down DC-DC Converter
______________________________________________________________________________________
11
Ensure that the ripple specification of the input capaci-
tor exceeds the worst-case capacitor RMS ripple cur-
rent. Use the following equations to calculate the input
capacitor RMS current:
IPRMS is the input switch RMS current, IAVGIN is the
input average current, and
η is the converter efficiency.
The ESR of aluminum electrolytic capacitors increases
significantly at cold temperatures. Use a 1µF or greater
value ceramic capacitor in parallel with the aluminum
electrolytic input capacitor, especially for input voltages
below 8V.
Output Filter Capacitor
The worst-case peak-to-peak and RMS capacitor ripple
current, allowable peak-to-peak output ripple voltage,
and the maximum deviation of the output voltage dur-
ing load steps determine the capacitance and the ESR
requirements for the output capacitors.
The output capacitance and its ESR form a zero, which
improves the closed-loop stability of the buck regulator.
Choose the output capacitor so the ESR zero frequency
(fZ) occurs between 20kHz to 40kHz. Use the following
equation to verify the value of fZ. Capacitors with 100m
to 250m
Ω ESR are recommended to ensure the closed-
loop stability while keeping the output ripple low.
The output ripple is comprised of
∆VOQ (caused by the
capacitor discharge) and
∆VOESR (caused by the ESR
of the capacitor). Use low-ESR tantalum or aluminum
electrolytic capacitors at the output. Assuming that the
contributions from the ESR and capacitor discharge
equal 80% and 20%, respectively, calculate the output
capacitance and the ESR required for a specified rip-
ple using the following equations:
The MAX5033 has an internal soft-start time (tSS) of
400µs. It is important to keep the output rise time at
startup below tSS to avoid output overshoot. The output
rise time is directly proportional to the output capacitor.
Use 68µF or lower capacitance at the output to control
the overshoot below 5%.
In a dynamic load application, the allowable deviation
of the output voltage during the fast-transient load dic-
tates the output capacitance value and the ESR. The
output capacitors supply the step load current until the
controller responds with a greater duty cycle. The
response time (tRESPONSE) depends on the closed-
loop bandwidth of the converter. The resistive drop
across the capacitor ESR and capacitor discharge
cause a voltage droop during a step load. Use a com-
bination of low-ESR tantalum and ceramic capacitors
for better transient load and ripple/noise performance.
Keep the maximum output-voltage deviation above the
tolerable limits of the electronics being powered.
Assuming a 50% contribution from the output capaci-
tance discharge and the ESR drop, use the following
equations to calculate the required ESR and capaci-
tance value:
where ISTEP is the load step and tRESPONSE is the
response time of the controller. Controller response
time is approximately one-third of the reciprocal of the
closed-loop unity-gain bandwidth, 20kHz (typ).
PC Board Layout Considerations
Proper PC board layout is essential. Minimize ground
noise by connecting the anode of the Schottky rectifier,
the input bypass-capacitor ground lead, and the output
filter-capacitor ground lead to a single point (star-
C
It
V
OUT
STEP
RESPONSE
OQ
=
×
ESR
V
I
OUT
OESR
STEP
=
C
I
Vf
OUT
L
OQ
SW
××
22
.
ESR
V
I
OUT
OESR
L
= ∆
f
C
ESR
Z
OUT
OUT
=
××
×
1
2
π
II
I
I
I
D
I
VI
V
II
I
II
I
and D
V
V
PRMS
PK
DC
PK
DC
AVGIN
OUT
OUT
IN
PK
OUT
L
DC
OUT
L
OUT
IN
=+
+
×
()
 ×
=
×
×
=+
=
=
22
3
22
,
η
∆∆
II
I
where
CRMS
PRMS
AVGIN
=−
22


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