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ML4818CP Folha de dados(PDF) 6 Page - Micro Linear Corporation

Nome de Peças ML4818CP
Descrição Electrónicos  Phase Modulation/Soft Switching Controller
Download  12 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

ML4818CP Folha de dados(HTML) 6 Page - Micro Linear Corporation

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ML4818
The ML4818 can also be used in current mode by sensing
load current on the RAMP input (pin 3).
The four output delay timers are programmed via an
external RDELAY resistor as shown below. This resistor
value should be no less than 1k
Ω. Expressing RDELAY in
k
Ω the delay, in ns is:
TR
DELAY
DELAY
+
33
45
(1)
The ML4818 contains special logic circuits to provide for
voltage mode feed-forward and lock out long pulses into
the internal logic. This prevents instability from occuring
when the
Φ Comparator trips in voltage mode.
3
RAMP
S
R
Q
Φ MOD
OUTPUT
OSC
QR
Figure 3. Voltage Feed-Forward Circuit.
The collector of QR in figure 3 is high only during a power
cycle. When the power cycle terminates, RAMP is pulled
low. In voltage mode operation, a capacitor is connected
from RAMP to GND with a resistor from RAMP to VIN to
provide input voltage feed forward.
OSCILLATOR
The ML4818 oscillator charges the external capacitor, CT,
with a current (ISET) equal to 5/RT. When the CT voltage
reaches the upper threshold (Ramp Peak), the comparator
changes state, turning on the current sink which
discharges CT to the lower threshold (Ramp Valley). The
CT pin is clamped to Ramp Valley by Q1 (Figure 5) to
prevent inaccuracy due to undershoot on CT.
To use the CLOCK output for driving external synch-
ronization circuitry, a pull-down resistor is required from
CLOCK to GND.
11
+
2
13
5V
CLOCK
OUT
5V
5.5mA
1.7V
RT
ISET
CT
ISET
250
Q1
Figure 5. Ocillator Block Diagram
For frequencies of less than 500kHz, oscillator frequency
can be set by using the following formulae:
f
CR
C
OSC
TT
T
=
+
1
0 52
500
.
(2)
ERROR AMPLIFIER
The ML4818 error amplifier is a 2.5MHz bandwidth,
8.5V/
µs slew rate op-amp with provision for limiting the
positive output voltage swing (output inhibit line) to
implement the soft start function. The error amplifier
output source current is limited to 4.5mA.
CLOCK
TD
CT
RAMP PEAK
RAMP VALLEY
TC
Figure 4. Ocillator Timing Diagram


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