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參數(shù)資料
| 型號： | ML4828 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | BiCMOS Phase Modulation/Soft Switching Controller(BiCMOS 相調(diào)制器/全橋軟開關(guān)控制器) |
| 中文描述： | BiCMOS工藝相位調(diào)制/軟開關(guān)控制器（BiCMOS工藝相調(diào)制器/全橋軟開關(guān)控制器） |
| 文件頁數(shù)： | 8/11頁 |
| 文件大?。?/td> | 187K |
| 代理商： | ML4828 |
8
ML4828
1V
2.5V
V(PIN 20)
V(PIN 12)
If the current limit condition persists, then I
RST
will be
reactivated, thus charging C
RST
to a higher level as shown
in Figure 7. Eventually, the voltage at RST will exceed
2.5V, and the soft start comparator will trip, shutting down
all power drivers and inhibiting any further delivery of
power. At the same time, the soft start capacitor C
SS
is
discharged to prepare for the next start up cycle.
During the I
LIM
shutdown, I
RST
is turned off, and C
RST
is
discharged through R
RST
with a time constant of:
t
R
C
RST
RST
RST
=
×
(12)
When the condition causing the current limit is removed,
R
RST
will discharge C
RST
with a time constant of t
RST.
When the voltage at RST (pin 12) drops to 1.25V, the soft
start comparator and the converter will undergo a start up
cycle. The restart delay (t
D(RST)
) is given by:
t
t
DRST
(
RST
)
.
=
×
1 39
(13)
For example, with C
RST
= 25
μ
F and R
RST
= 240k
:
dv
dt
A
F
V
s
=
μ
μ
=
500
25
20
(14)
and
t
k
F
s
DRST
(
)
(
)
.
.
=
×
μ
×
=
240
25
1 39
8 3
(15)
Since the threshold for shutdown is 2.5V, the controller
will shut down after approximately 125ms. After the
converter recovers form the current limit condition, the
controller will reactivate after 8.3s.
UNDERVOLTAGE LOCKOUT
During start-up, the ML4828 draws very little current
(typically 150
μ
A) and V
REF
is disabled. When V
CC
rises
above 6.0V, the internal circuitry and V
REF
are enabled,
and will stay enabled until V
CC
falls below the 4.5V UV
lockout threshold.
SHUTDOWN FUNCTION
The ML4828 can be externally shut down by bringing
SDN (pin 19) low. The shutdown threshold (V
SD
) is given
by
V
V
SD
CC
=
×
0 33
.
(16)
For example, if V
CC
= 5V, then V
SD
= 1.67V. As long as
2.4V < V
CC
< 6.0V, the SDN pin will be TTL compatible.
Figure 7. I
LIM
and Resulting RC
RST
Waveforms During Short Circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4828CP | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:BiCMOS Phase Modulation/Soft Switching Controller |
| ML4828CP UP DIE | 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4828CS | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:BiCMOS Phase Modulation/Soft Switching Controller |
| ML4828IP | 制造商:Rochester Electronics LLC 功能描述: |
| ML4828IP-G | 制造商:Rochester Electronics LLC 功能描述: |
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