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UC2825AQDWREPG4 Folha de dados(PDF) 7 Page - Texas Instruments

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Nome de Peças UC2825AQDWREPG4
Descrição Electrónicos  HIGH-SPEED PWM CONTROLLER
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

UC2825AQDWREPG4 Folha de dados(HTML) 7 Page - Texas Instruments

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R
T +
3 V
(10 mA)
1 * DMAX
C
T +
1.6
D
MAX
R
T
f
(1)
UDG−95102
R
C
CT
RT
IR
3 V
IC−IR
CLK
ID = 10 mA
LEB
VTH
1 k
10 k
70
75
80
85
90
95
100
100 k
RT − Timing Resistance − W
MAXIMUM DUTY CYCLE
vs
TIMING RESISTANCE
10 M
1 M
100 k
10 k
1 k
10 k
100 k
RT − Timing Resistance − W
OSCILLATOR FREQUENCY
vs
TIMING RESISTANCE
UC2825A-EP
www.ti.com
SGLS305D – JULY 2005 – REVISED SEPTEMBER 2010
APPLICATION INFORMATION
The oscillator of the UC2825A-EP 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 then can 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.
Copyright © 2005–2010, Texas Instruments Incorporated
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