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UC1825BJ Scheda tecnica(PDF) 6 Page - Texas Instruments

Il numero della parte UC1825BJ
Spiegazioni elettronici  High Speed PWM Controller
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UC1825BJ Scheda tecnica(HTML) 6 Page - Texas Instruments

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UC1823A,UC2823A, UC2823B,
UC3823A,UC3823B,UC1825A,
UC2825A,UC2825B,UC3825A,UC3825B
SLUS334C − AUGUST 1995 − REVISED AUGUST 2004
www.ti.com
6
APPLICATION INFORMATION
The oscillator of the UC3823A, UC3823B, UC3825A, and UC3825B is a saw tooth. The rising edge is governed by a current
controlled by the RT pin and value of capacitance at the CT pin (CCT). The falling edge of the sawtooth sets dead time for
the outputs. Selection of RT should be done first, based on desired maximum duty cycle. CT can then be chosen based
on the desired frequency (RT) and DMAX. The design equations are:
R
T +
3V
(10 mA)
1
* D
MAX
C
T +
1.6
D
MAX
R
T
f
Recommended values for RT range from 1 kΩ to 100 kΩ. Control of DMAX less than 70% is not recommended.
UDG−95102
Figure 1. Oscillator
10 M
1 M
100 k
10 k
1 k
10 k
100 k
Figure 2
RT − Timing Resistance − W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
Figure 3
1 k
10 k
70
75
80
85
90
95
100
100 k
RT − Timing Resistance − W
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
(1)


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