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參數(shù)資料
| 型號： | AMS34063S |
| 廠商： | Advanced Monolithic Systems, Inc. |
| 英文描述： | DC-TO-DC CONVERTER CONTROL CIRCUIT |
| 中文描述： | 的DC - DC轉(zhuǎn)換器控制電路 |
| 文件頁數(shù)： | 6/7頁 |
| 文件大?。?/td> | 69K |
| 代理商： | AMS34063S |
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS34063
APPLICATION HINTS
Design Formula Table
Calculation
t
Step-Down
Step-Up
OFF
t
ON
OUT
SAT
1
IN(MIN)
F
OUT
V
V
V
V
V
+
V
1
V
V
-
V
V
SAT
IN(MIN)
IN(MIN)
F
OUT
+
(t
ON
+ t
OFF
)
MAX
MIN
f
MIN
f
C
T
4 x 10
-5
t
ON
4 x 10
-5
t
ON
MAX
I
PK(switch)
2I
OUT(MAX)
(
)
+
OFF
t
OFF
t
ON
OUT
t
2I
R
SC
0.33/I
PK(switch)
0.33/I
PK(switch)
L
(MIN)
)
ON(MAX
t
PK(switch)
I
OUT
V
SAT
V
IN(MIN)
V
)
ON(MAX
PK(switch)
I
SAT
V
IN(MIN)
V
t
C
O
P)
ripple(P
OFF
ON
PK(switch)
8V
)
t
(t
I
+
ripple
V
ON
t
OUT
I
≈
V
SAT
= Saturation voltage of the output switch.
V
F
= Forward voltage drop of the ringback rectifier.
Notes
The following power supply characteristics must be chosen:
V
IN
– Nominal input voltage. If this voltage is not constant, then use V
IN(MAX)
for step-down and V
IN(MIN)
for step-up converter.
V
OUT
– Desired output voltage,
+
=
1
2
OUT
V
R
R
1.25
.
I
OUT
- Desired output current.
f
MIN
- Minimum desired output switching frequency at the selected values for V
IN
and I
O
.
V
ripple(P-P)
– Desired peak-to-peak output ripple voltage. In practice, the calculated value will need to be increased due to the
capacitor’s equivalent series resistance and board layout. The ripple voltage should be kept to a low value since it will
directly effect the line and load regulation.
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