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參數(shù)資料
| 型號(hào)： | RC5061 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Performance Programmable Synchronous DC-DC Controller for Multi-Voltage Platforms |
| 中文描述： | 高性能可編程同步DC - DC控制器的多電壓平臺(tái) |
| 文件頁(yè)數(shù)： | 16/18頁(yè) |
| 文件大?。?/td> | 135K |
| 代理商： | RC5061 |
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RC5061
PRODUCT SPECIFICATION
16
REV. 1.0.0 7/6/00
Appendix
Worst-Case Formulae for the Calculation of
Cout, R7, and Cin (Circuit of Figure 1 only)
The following formulae design the RC5061 for worst-case
operation, including initial tolerance and temperature depen-
dence of all of the IC parameters (initial setpoint, reference
tolerance and tempco, active droop tolerance, current sensor
gain), the initial tolerance and temperature dependence of
the MOSFET, and the ESR of the capacitors. The following
information must be provided:
V
T+
, the value of the positive transient voltage limit;
|V
T-
|, the absolute value of the negative transient voltage
limit;
I
O
, the maximum output current;
V
nom
, the nominal output voltage;
V
in
, the input voltage (typically 5V);
ESR, the ESR of the ouput caps, per cap (44m
for the
Sanyo parts shown in this datsheet);
R
D
, the on-resistance of the MOSFET (10m
for the
FDB7030);
R
D
, the tolerance of the current sensor (usually about 67%
for MOSFET sensing, including temperature).
I
rms
, the rms current rating of the input caps (2A for the
sanyo parts shown in this datasheet.)
The value of R7 must be
≤
8.3K
. If a greater value is calcu-
lated, R
D
must be reduced.
Number of capacitors needed fo C
out
= the greater of:
Example:
Suppose that the transient limits are ±134mV, cur-
rent I is 14.2A, and the nominal voltage is 2.000V, using
MOSFET current sensing and the usual caps. We have V
T+
=
|V
T-
| = 0.134, I
O
= 14.2, V
nom
= 2.000, and
R
D
= 0.67. We
calculate:
Since X > Y, we choose X, and round up to find we need 5
capacitors for C
OUT
.
2
I
rms
V
in
V
nom
V
in
V
nom
*
IO
C
in
–
=
50 * 10
-
6
I
O
* R
D
* (1 +
R
D
) * 1.10
R7 =
V
T-
ESR * I
O
ESR * I
O
X =
18 * R5 * 1.1
14400 * I
O
* R
D
Y
or
V
T+
–
0.004 * V
nom
+
=
2
5
2.000
5
2.000
*
14.2
C
in
2
3.47
4 caps
=
–
=
=
=
5.2K
50 * 10
-6
14.2 * 0.010 * (1 + 0.67) * 1.0
R5
4.28
18 * 10400 * 1.1
14400 * 14.2 * 0.020
0.134
–
0.004 * 2.000
0.044 * 14.2
Y
=
+
=
4.66
0.134
0.044 * 14.2
X
=
=
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