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参数资料
| 型号： | FAN5056V90M |
| 厂商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封装： | SOIC-24 |
| 文件页数： | 9/19页 |
| 文件大小： | 266K |
| 代理商： | FAN5056V90M |
FAN5056V85/FAN5056V90
REV. 0.8.0 1/31/01
17
Pr
eliminar
y
Specication
Appendix
Worst-Case Formulae for the Calculation of
Cin, Cout, R5, R7 and Roffset (Circuits similar
to Figure 1 only)
The following formulae design the FAN5056 for worst-case
operation, including initial tolerance and temperature depen-
dence of all of the IC parameters (initial setpoint, reference
tolerance and tempco, internal droop impedance, current
sensor gain), the initial tolerance and temperature depen-
dence of the MOSFET, and the ESR of the capacitors. The
following information must be provided:
VS+, the value of the positive static voltage limit;
|VS-|, the absolute value of the negative static voltage limit;
VT+, the value of the positive transient voltage limit;
|VT-|, the absolute value of the negative transient voltage
limit;
IO, the maximum output current;
Vnom, the nominal output voltage;
Vin, the input voltage (typically 5V);
Irms, the ripple current rating of the input capacitors, per cap
(2A for the Sanyo parts shown in this data sheet);
RD, the resistance of the current sensor (usually the MOSFET);
RD, the tolerance of the current sensor (usually about 67%
for MOSFET sensing, including temperature); and
ESR, the ESR of the output capacitors, per cap (44m
for
the Sanyo parts shown in this data sheet).
Number of capacitors needed for COUT = the greater of:
Example: Suppose that the static limits are +89mV/-79mV,
transient limits are ±134mV, current I is 14.2A, and the nom-
inal voltage is 2.000V, using MOSFET current sensing. We
have VS+ = 0.089, |VS-| = 0.079, VT+ = |VT-| = 0.134, IO =
14.2, Vnom = 2.000, and RD = 1.67. We calculate:
Since Y > X, we choose Y, and round up to nd we need 7
capacitors for COUT.
A detailed explanation of this calculation may be found in
Applications Bulletin AB-24.
2
Irms
.029 * Vnom
Vin
Vnom
Vin
Vnom
*
IO
Cin
–
=
45 * 10-6
IO* RD * (1 + RD)
R7
* 1K
=
VS+ – .014 * Vnom – .029
Roffset =
18 * (VS+ + VS- – .024 * Vnom)
14400 * IO* RD * (1 + RD) *1.1
R5 =
VT-
+ VS+ – .024 * Vnom
ESR * IO
X=
18 * R5 * 1.1
14400 * IO * RD
Y
or
VT+ – VS+ +
=
2
5
2.000
5
2.000
*
14.2
Cin
2
3.47
4 caps
=
–
=
3.48K
18 * (0.089 + 0.079 – .024 * 2.000)
14400 * 14.2 * 0.020 * (1 + 0.67) * 1.1
R5
=
10.5K
45 * 10-6
14.2 * 0.020 * (1 + 0.67)
R7
=
*1000 = 15.8
0.29 + 2.000
0.089 – .014 * 2.000 – .029
Roffset
3.57
0.134 + 0.089 – .024 * 2.00
0.044 * 14.2
X
=
6.14
18 * 3640 * 1.1
14400 * 14.2 * 0.020
0.134 – 0.089
0.044 * 14.2
Y
=
+
=
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