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ML4813CP Folha de dados(PDF) 6 Page - Micro Linear Corporation

Nome de Peças ML4813CP
Descrição Electrónicos  Flyback Power Factor Controller
Download  15 Pages
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Fabricante Electrônico  MICRO-LINEAR [Micro Linear Corporation]
Página de início  http://www.microlinear.com
Logo MICRO-LINEAR - Micro Linear Corporation

ML4813CP Folha de dados(HTML) 6 Page - Micro Linear Corporation

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ML4813
6
FUNCTIONAL DESCRIPTION
OSCILLATOR
The ML4813 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:
tt
t
OSC
RAMP
DEADTIME
=+
(1)
where:
t
C
I
RAMP
T
SET
=
(2)
and:
t
C
mA I
DEADTIME
T
SET
=
-
84
.
(3)
A graph showing the relationship between RT, CT, the
oscillator frequency, and maximum duty cycle is given in
Figure 1. A pulse of a duration shorter than tDEADTIME
from an external frequency source set to a higher
frequency than fOSC can be applied to pin SYNC to
synchronize the oscillator. RSYNC and CSYNC shorten
longer pulses, as shown in Figure 2.
OUTPUT DRIVER STAGE
The ML4813 output driver is a 1A peak output high speed
totem-pole circuit designed to quickly drive capacitive
loads such as MOSFET gates. See Figure 3 for the output
saturation characteristics for sourcing and sinking current.
ERROR AMPLIFIER
The ML4813 error amplifier is a high open loop gain,
wide bandwidth amplifier. See Figure 4 for the gain and
phase plot.
UN-COMMITTED OP-AMP
The ML4813 contains an uncommitted op amp which is
normally configured as a differencing amplifier to sense
the output voltage. The output voltage in the flyback
configuration is not ground referenced. The op amp in the
ML4813 is a PNP input amplifier similar to the LM324
but with an open emitter class A output stage.
REFERENCE
The reference output voltage versus output current
characteristic is shown in Figure 5.
UNDERVOLTAGE LOCKOUT
On power-up, the ML4813 is in the UVLO condition;
Figure 1. Oscillator Timing Resistance vs. Frequency
Figure 2. Oscillator Block Diagram
10
SYNC
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%
output low and quiescent current low. The ML4813
becomes operational when VCC reaches 16V. When VCC
drops below 10V, the UVLO condition is re-imposed.
During UVLO, the VREF pin is off, making it usable as a
"flag" for starting up a down-stream PWM converter.


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