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ML4823IQ Folha de dados(PDF) 5 Page - Fairchild Semiconductor

Nome de Peças ML4823IQ
Descrição Electrónicos  High Frequency Power Supply Controller
Download  9 Pages
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Fabricante Electrônico  FAIRCHILD [Fairchild Semiconductor]
Página de início  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4823IQ Folha de dados(HTML) 5 Page - Fairchild Semiconductor

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ML4823
REV. 1.0 10/12/2000
5
FUNCTIONAL DESCRIPTION
OSCILLATOR
The ML4823 oscillator charges the external capacitor (CT)
with a current (ISET) equal to 3/RSET. When the capacitor
voltage reaches the upper threshold (Ramp Peak), the
comparator changes state and the capacitor discharges to
the lower threshold (Ramp Valley) through Q1. While the
capacitor is discharging, Q2 provides a high pulse.
The oscillator period can be described by the following
relationship:
TOSC = TRAMP + TDEADTIME
where: TRAMP = C (Ramp Valley to Peak)/ISET
and:
TDEADTIME = C (Ramp Valley to Peak)/IQ1
+
5.1V
Q1
RT
RT
ISET
CT
ISET
400
µA
IQ1
3V
Q2
CLOCK
OUT
CLOCK OUT
TD
CT
RAMP PEAK
RAMP VALLEY
Figure 2. Oscillator Timing Resistance vs Frequency
Figure 4. Oscillator Deadtime vs CT (3ký - RT - 100ký)
30
25
20
15
10
5
0
0.47
1.0
2.2
4.7
10.0
22
CT (nF)
47
100
160
140
120
100
80
10k
100k
1M
FREQ (Hz)
1.0nF
470pF
Figure 3. Oscillator Deadtime vs Frequency
Figure 1. Oscillator Block Diagram
100k
10k
1k
0.1k
1k
10k
100k
1M
10M
FREQ (Hz)
100nF
47nF
22nF
10nF
4.7nF
2.2nF
1nF
470pF


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