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UC28025DWR Scheda tecnica(PDF) 11 Page - Texas Instruments

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Il numero della parte UC28025DWR
Spiegazioni elettronici  ECONOMY HIGH-SPEED PWM CONTROLLER
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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UC28025DWR Scheda tecnica(HTML) 11 Page - Texas Instruments

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UC28023
UC28025
SLUS557F -- MARCH 2003 -- REVISED AUGUST 2010
11
www.ti.com
APPLICATION INFORMATION
OSCILLATOR
Figure 7. Oscillator Circuit
UDG--03052
6
4
CT
UC2802x
CLOCK
3V
5
RT
Blanking
5.1 V
IR
IC= IR
TD
400 μA
Figure 8.
0.47
0.22
0.047
1.0
2.2
4.7
10.0
22.0
47
0.10
2.20
0.47
1.00
4.70
10.0
100
CT -- Timing Capacitance -- nF
DEAD TIME
vs
TIMING CAPACITANCE
3kΩ≤ RT ≤ 100 kΩ
Figure 9. Oscillator Circuit
10 k
1k
100 k
1 k
10 k
100 k
1 M
100
10 nF
22 nF
47 nF
100 nF
fOSC -- Frequency -- Hz
470 pF
1nF
2.2 nF
4.7 nF
TIMING RESISTANCE
vs
FREQUENCY
Figure 10.
DEAD TIME
vs
FREQUENCY
160
140
120
100
80
10 k
100 k
1 M
CT =1nF
fOSC -- Frequency -- Hz
CT = 470 pF


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