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PWM5031 View Datasheet(PDF) - Aeroflex Corporation

Part Name
Description
Manufacturer
PWM5031
Aeroflex
Aeroflex Corporation Aeroflex
PWM5031 Datasheet PDF : 17 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Dead Time
The amount of dead time determines the maximum duty cycle that can be achieved. The Dead Time and the frequency of
operation will determine the duty cycle.
Dead Time = 5280 (Cset + 12pF)
Duty
Cycle
=
1
-D----e1---a----d-F---o-T---si--m-c----e-⎠⎞
Selecting Rset and Cset
To select values for Rset and Cset perform the following steps to insure the smallest Dead Time..
1) Determine what frequency is required for your design.
y 2) Use Figure 4 to select a capacitor value for Cset that will provide the highest duty cycle (shortest Dead Time) at
r the frequency required.
3) Calculate the value of Rset using the formula:
ina Rset = .--8---4-----×-----F----o-1--s--c---×-----C----s--e--t
elim Note small values of Rset increase power consumption for the PWM5031 and small values of Cset may make PCB and
Pr stray capacitance a source of error.
100
98
390pF
200pF 100pF
96
Duty Cycle 94
%
92
47pF
20pF
10pF
90
88
86
10K
100K
1M
Frequency Hz
FIGURE 4 – Duty Cycle vs Frequency
SCD5031 Rev B
9
 

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