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ML4818 Folha de dados(PDF) 8 Page - Micro Linear Corporation

Nome de Peças ML4818
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

ML4818 Folha de dados(HTML) 8 Page - Micro Linear Corporation

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ML4818
Figure 10. Over-Current, Soft-Start, and Integrating Fault Detect Circuits.
CRST
+
RRST
12
+
9
4
INHIBIT
OUTPUT
UNDER-VOLTAGE
LOCKOUT
CLOCK
3.4V
1.3V
RCRESET
RSENSE
R1
C1
V+
I2
S
Q
R
TERMINATE
PWM CYCLE
V+
I1
SOFT START
ISWITCH
CSS
ILIM
1V
1V
3.4V
V(PIN 4)
V(PIN 12)
1V
3.4V
V(PIN 4)
V(PIN 12)
Figure 11c, 11d. ILIMIT and Resulting RCRESET
Waveforms During Load Surge.
Figure 11a, 11b. ILIMIT and Resulting RCRESET
Waveforms During Short Circuit.
CURRENT LIMIT, FAULT DETECTION AND SOFT START
Current limit is implemented when the current sensed on
ILIM reaches the 1V limit. At this point, the PWM cycle is
terminated. The flip flop (Figure 10) turns on the current
source to charge CRST and remains on for the duration of
the clock period. When CRST has charged to 3.4V, a soft
start reset occurs. The number of times the PWM cycle is
terminated due to over-current is “remembered” on CRST.
Over time, CRST is discharged by RRST providing a
measure of “forgetting” when the over-current condition
no longer occurs. This integrating fault detection is useful
in differentiation between short circuit and load surge
conditions.
Since the per cycle charge on RCRESET is proportional to
how early in the power cycle the over-current occurs, a
reset will occur more quickly under output short circuit
conditions (Figures 11a and 11b) than during a load surge
(Figures 11c and 11d).
When the soft start reset occurs, the output is inhibited
and the soft start capacitor is discharged. The output will
remain off until CRST discharges to 1.3V through RRST,
providing a reset delay. When the IC restarts, the error
amplifier output voltage is limited to the voltage at SOFT
START, thus limiting the duty cycle.


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