參數(shù)資料
型號(hào): NCP1562B
廠商: ON SEMICONDUCTOR
英文描述: High Performance Active Active Clamp/Reset PWM Controller Controller(高性能有效Active Clamp/Reset PWM控制器)
中文描述: 高性能主動(dòng)有源鉗位/復(fù)位PWM控制器控制器(高性能有效有源鉗位/復(fù)位的PWM控制器)
文件頁數(shù): 16/26頁
文件大?。?/td> 277K
代理商: NCP1562B
NCP1562A, NCP1562B
http://onsemi.com
16
Figure 36. Soft-Stop Behavior After Soft-Start
is Complete and V
EA
is Open.
(V
EA
is not controlling the duty cycle)
V
EA
FF Ramp
V
SS
If the voltage on the V
AUX
pin reaches V
AUX(off2)
, C
SS
is
immediately discharged and the outputs are disabled. V
SS
should not be pulled up or down externally.
CURRENT LIMIT
The
NCP1562
cycle-by-cycle and cycle skip, providing the best
protection during momentary and continuous overcurrent
conditions.
has
two
overcurrent
modes,
Cycle-by-Cycle
In cycle-by-cycle, the conduction period ends once the
voltage on the CS pin reaches the current limit voltage
threshold (V
ILIM
). The NCP1562A has a V
ILIM
of 0.2 V
and the NCP1562B has a V
ILIM
of 0.5 V.
Cycle Skip
Traditionally, a voltage on the CS higher than V
ILIM
has
been used to trigger a cycle skip fault. Unfortunately, the
fast response time of modern controllers makes it hard to
reach a voltage on the CS pin higher than V
ILIM
.
Instead of using a higher voltage threshold to detect a
cycle skip fault, the NCP1562 uses a timer. It monitors the
current
limit
comparator
cycle-by-cycle current limit condition exists the converter
is disabled. The time to disable the converter and the time
the converter is disabled are programmed by the capacitor
on the CSKIP pin, C
CSKIP
.
The cycle skip detection circuit charges C
CSKIP
with a
continuous 100 A current once cycle-by-cycle current
limit fault is detected. If the current limit fault persists,
C
CSKIP
continues to charge until reaching the cycle skip
upper threshold (V
CSKIP(peak)
) of 3.0 V. Once reached, the
converter enters the soft–stop mode and C
CSKIP
is
discharged with a constant 10 A current. A new soft-start
sequence commences once C
CSKIP
reaches the lower cycle
skip threshold (V
CSKIP(valley)
) of 0.5 V. If the overcurrent
condition is still present, the capacitor starts charging on
the next current limit event. Otherwise, C
CSKIP
is
discharged down to 0 V.
The cycle skip capacitor provides a means of
remembering previous overcurrent conditions. If a
continuous overcurrent condition is removed before
reaching V
CSKIP(peak)
, C
CSKIP
starts a controlled
discharge. If the continuous overcurrent fault is once again
detected before C
CSKIP
is completely discharged, C
CSKIP
charges from its existing voltage level, taking less time to
reach V
CSKIP(peak)
. Figure 37 shows operating waveforms
during a continuous overcurrent condition. For optimal
operation, the cycle skip discharge time should be longer
than the soft-stop period.
and
if
a
continuous
Figure 37. Cycle Skip Waveforms
V
CSKIP(valley)
V
CSKIP(peak)
V
CSKIP
CS
V
ILIM
V
SS
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