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ML4812IQ Datenblatt(PDF) 5 Page - Fairchild Semiconductor

Teilenummer ML4812IQ
Bauteilbeschribung  Power Factor Controller
Download  16 Pages
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Hersteller  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

ML4812IQ Datenblatt(HTML) 5 Page - Fairchild Semiconductor

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ML4812
REV. 1.0 10/10/2000
5
FUNCTIONAL DESCRIPTION
OSCILLATOR
The ML4812 oscillator charges the external capacitor (CT)
with a current (ISET) equal to 5/RSET. When the capacitor
voltage reaches the upper threshold, the comparator
changes state and the capacitor discharges to the lower
threshold through Q1. While the capacitor is discharging,
Q2 provides a high pulse.
The Oscillator period can be described by the following
relationship:
Figure 2. Oscillator Timing Resistance vs. Frequency
Figure 1. Oscillator Block Diagram
Figure 3. Output Saturation Voltage vs. Output Current
10
SYNC
Q2
Q1
9
RT
16
CT
EXTERNAL
CLOCK
+
-
5.6V
ISET
8.4mA
CT
RT
ISET
CSYNC
RSYNC
CLOCK
tD
RAMP VALLEY
RAMP PEAK
V(CT)
10
OSCILLATOR FREQUENCY (kHz)
10
100
1000
8
5
3
2
1
10nF
20nF
5nF
2nF
1nF
85%
80%
70%
90%
15
14
13
3
2
1
0
OUTPUT CURRENT (mA)
0
200
400
800
600
VCC
VCC = 15V
80µs PULSED LOAD
120Hz RATE
GND
SOURCE SATURATION
LOAD TO GROUND
SINK SATURATION
LOAD TO VCC
TT
T
OSC
RAMP
DEADTIME
=+
where:
V
V
D
OUT
IN
ON
=
-
1
and:
T
CV
mA I
DEADTIME
T
RAMP VALLEY TO PEAK
SET
=
´
-
84
.


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