參數(shù)資料
型號： FAN5059
廠商： Fairchild Semiconductor Corporation
英文描述： High Performance Programmable Synchronous
中文描述： 高性能可編程同步
文件頁數(shù)： 16/18頁
文件大?。?/td> 206K
代理商： FAN5059
FAN5059
PRODUCT SPECIFICATION
16
REV. 1.0.4 8/14/03
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 FAN5059 for worst-case
operation, including initial tolerance and temperature dependence
of all of the IC parameters (initial setpoint, reference tolerance
and tempco, internal droop impedance, 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
S+
, the value of the positive static voltage limit;
|V
S-
|, the absolute value of the negative static voltage limit;
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);
I
rms
, the ripple current rating of the input capacitors, per cap
(2A for the Sanyo parts shown in this datasheet);
R
D
, the resistance of the current sensor (usually the MOSFET);
R
D
, 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 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 for C
out
= the greater of:
Example:
Suppose that the static limits are +89mV/-79mV,
transient limits are ±134mV, current I is 14.2A, and the
nominal voltage is 2.000V, using MOSFET current sensing.
We have V
S+
= 0.089, |V
S-
| = 0.079, V
T+
= |V
T-
| = 0.134, I
O
= 14.2, V
nom
= 2.000, and
R
D
= 1.67. We calculate:
Since Y > X, we choose Y, and round up to find we need 7
capacitors for C
OUT
.
A detailed explanation of this calculation may be found in
Applications Bulletin AB-24.
2
I
rms
1.01 * V
nom
V
in
V
nom
V
in
V
nom
*
IO
C
in
–
=
45 * 10
-
6
I
O
* R
D
* (1 +
R
D
)
R7
* 1K
=
V
S+
– .024 * V
nom
R
offset
=
18 * (V
S+
+ V
S-
– .024 * V
nom
)
14400 * I
O
* R
D
* (1 +
R
D
) *1.1
R5 =
V
T-
+ V
S+
– .024 * V
nom
ESR * I
O
ESR * I
O
X =
18 * R5 * 1.1
14400 * I
O
* R
D
Y
or
V
T+
– V
S+
+
=
2
5
2.000
5
2.000
*
14.2
C
in
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
=
=
5.25K
45 * 10
-6
14.2 * 0.010 * (1 + 0.67)
R7
=
=
20.3
*1000
1.01 * 2.000
0.089 – .024 * 2.000
R
offset
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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相關代理商/技術參數(shù)
參數(shù)描述
FAN5059_BBA3026B WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN5059M 功能描述:開關變換器、穩(wěn)壓器與控制器 DC-DC Controller HP Programmable Sync RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
FAN5059M_Q 功能描述:開關變換器、穩(wěn)壓器與控制器 DC-DC Controller HP Programmable Sync RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
FAN5059MX 功能描述:開關變換器、穩(wěn)壓器與控制器 DC-DC Controller HP Programmable Sync RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
FAN5061 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Mode SMPS Controller
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