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SS6578CNTR Scheda tecnica(PDF) 9 Page - Silicon Standard Corp.

Il numero della parte SS6578CNTR
Spiegazioni elettronici  High-Efficiency, Step-Down DC/DC Controller
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Produttore elettronici  SSC [Silicon Standard Corp.]
Homepage  http://www.siliconstandard.com
Logo SSC - Silicon Standard Corp.

SS6578CNTR Scheda tecnica(HTML) 9 Page - Silicon Standard Corp.

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SS6578
VIN
1
DUTY
2
SHDN
3
FB
4
GND
5
DRI
6
CS-
7
CS+
8
U1 SS6578
R3
47K
R4
27K
C2
0.1uF
+VIN = 5~18V
+VOUT, 3.3V
Rs
+
C4
470
µF
D1
SS32
+
C1
100
µF
L1
33
µH
R6
1M
Q1
SSM4435
R7
*
Q2
R1
3K3
C3
1
µF
D2
LL4148
R2
100K
<15V
***
*
VIN>15V, R7=15Ω
VIN≤15V, R7=0Ω*
***
R6 can adjust the duty cycle max. It can be 0
Fig 11. DC/DC Buck Converter VOUT=3.3V
B. Short Circuit Protection Design
1.
As
we
know,
Short
Circuit
Protection
(abbreviated as SCP) does not always exist in
the DC-DC converter circuit. The fact is usually
the DC-DC converter provides the circuits
attached to VOUT with low power or low
voltage. Sometimes there is less concern about
safety, as the probability of short-circuit is
quite low. That gives users reasons to ignore
the use of an SCP circuit. However, we would still
like to point out the importance of the
protection. With SCP, the system will be well
protected in any situation. Two SCP circuits
are introduced as follows for your reference.
2.
Design1: shown as Fig. 12.
Method: Add a fast fuse to VOUT.
A fuse can be selected to pass
the start up current, but open quickly
with a large unexpected current. Of
course,
replacement
of
the
fuse
is needed after short circuit.
3.
Design 2: shown as Fig. 13.
Method: Add a SCP circuit
Note: 1. The time constant, which is
directly related to R1 and C1,
has a serious effect on the
circuit.
2. Circuit can be recovered by
removing the short circuit
event from the system.
3. The condition for applying
this design is VOUT ≥3V.
Rev.2.02 4/06/2004


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