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参数资料
| 型号： | SS6578 |
| 厂商： | Electronic Theatre Controls, Inc. |
| 英文描述： | HIGH EFFICIENCY STEP DOWN DC/DC CONTROLLER |
| 中文描述： | 高效率降压DC / DC控制器 |
| 文件页数： | 9/11页 |
| 文件大小： | 221K |
| 代理商： | SS6578 |
www.SiliconStandard.com 9 of 11
SS6578
VIN
DUTY
SHDN
FB
U1
SS6578
1
2
3
4
GND
5
DRI
6
CS
-
7
CS
+
8
R3
47K
R4
27K
C2
0.1uF
+V
IN
= 5~18V
+V
OUT
, 3.3V
Rs
+
C4
470
μ
F
D1
SS32
+
100
μ
F
C1
L1
33
μ
H
R6
1M
Q1
SSM4435
R7
*
Q2
R1
C3
1
μ
F
D2
LL4148
R2
100K
<
15V
***
*
V
IN
>15V, R7=15
V
IN
≤
15V, R7=0
*
*** R6 can adjust the duty cycle max. It can be 0
Fig 11. DC/DC Buck Converter V
OUT
=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 V
OUT
.
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 V
OUT
≥
3V.
Rev.2.0
2
4
/06/200
4
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