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UC2825A-Q1 датащи(PDF) 6 Page - Texas Instruments

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номер детали UC2825A-Q1
подробное описание детали  HIGH-SPEED PWM CONTROLLER
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UC2825A-Q1 датащи(HTML) 6 Page - Texas Instruments

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APPLICATION INFORMATION
R
T +
3 V
(10 mA)
1 * DMAX
C
T +
1.6
D
MAX
R
T
f
(1)
CLK
LEB
IC = IR
IR
R
T
C
T
ID = 10 mA
V
TH
R
C
3 V
1 k
10 k
70
75
80
85
90
95
100
100 k
RT - Timing Resistance -
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
W
10 M
1 M
100 k
10 k
1 k
10 k
100 k
RT - Timing Resistance - W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
UC2825A-Q1
SLUS781 – SEPTEMBER 2007
The oscillator is a sawtooth. 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:
Recommended values for RT range from 1 kΩ to 100 kΩ. Control of DMAX less than 70% is not recommended.
Figure 1. Oscillator
Figure 2.
Figure 3.
6
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