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參數(shù)資料
| 型號： | 293D107X0010D2 |
| 廠商： | Intersil Corporation |
| 英文描述： | The EL7562 is a Buck (Step Down) DC:DC controller with integrated synchronous MOSFETs in a 16-pin QSOP package. |
| 中文描述： | 該EL7562是巴克（降壓）直流：直流集成在一個16個同步MOSFET，控制器引腳QSOP封裝。 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大?。?/td> | 638K |
| 代理商： | 293D107X0010D2 |
3
Design Considerations
Choosing the Component Values
The following requirements are specified for a DC:DC
converter:
Input voltage range: V
IN
= 4.5V-5.5V
Output voltage: V
O
= 3.3V
Max output voltage ripple:
V
O
= 50mV
Output max current: I
O
= 2A
The following steps briefly outline the steps to choose
components.
1. Choose the feedback resister divider.
The output voltage is decided by:
2. Choose the converter switching frequency F
S
.
F
S
, inductor L
1
, output capacitor C
7
, and EL7562’s
switching loss are closely related. many iterations (or
thermal measurements) may be required before a final
value can be decided.
Please refer to the EL7562 data sheet for the F
S
vs
C
OSC
curve.
3. Inductor L
1
.
The EL7562 is internally ramp-compensated. For
optimal operation, the inductor current ripple should be
less than 0.6A.
If
I
L
= 0.5A, then:
(
D
)
–
L
where:
Choosing L
1
= 4.7μH yields
I
LMAX
= 0.56A. L
1
should
also be able to handle DC current of 2A and peak
current of 2.3A at temperature range.
4. Output capacitor C
7
.
V
O
and
I
L
normally decide C
7
value.
V
O
requires
ESR of C
7
be less than:
V
LMAX
Double-check the RMS current requirement of the output
capacitor:
which is 0.16A. For a capacitor or combination of
capacitors with 89m
parallel ESR, it is more than
enough to handle this current.
5. Input capacitors C
1
and C
2
.
If all the AC current is handled by the input capacitors its
RMS current is calculated as:
This gives almost 0.99A when D = D
MAX
. Therefore a
cap with 0.99A current handling capability should be
chosen. However, in case some other capacitor is
sharing current with it, this current requirement can be
reduced.
Layout Considerations
The layout is very important for the converter to function
properly. Power Ground ( ) and Signal Ground (
be separated to ensure that the high pulse current in the
Power Ground never interferes with the sensitive signals
connected to Signal Ground. They should only be connected
at one point (normally at the negative side of either the input
or output capacitor.)
) should
The trace connected to pin 14 (FB) is the most sensitive
trace. It needs to be as short as possible and in a “quiet”
place, preferably between the PGND and SGND traces.
In addition, the bypass capacitor C
3
should be as close to
pins 1 and 3 as possible.
The heat of the chip is mainly dissipated through the PGND
pins. Maximizing the copper area around these pins is
preferable. In addition, a solid ground plane is always helpful
for the EMI performance.
V
OUT
0.985
1
R
2
R
1
------
+
×
=
For V
IN
= 5V
V
OUT
0.975
1
R
2
R
1
------
+
×
=
For V
IN
= 3.3V
L
1
V
O
×
S
---------------------------------
=
D
V
O
V
IN
---------
=
ESR
--------------------
89m
=
=
I
C7
I
12
--------------------
=
I
IN,rms
D
[
1
(
D
)]
–
×
I
O
×
=
Technical Brief 423
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 293D107X0010D2T | 功能描述:鉭質電容器-固體SMD 100uF 10volts 20% D case Molded RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫存號:E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk |
| 293D107X0010D2TE3 | 功能描述:鉭質電容器-固體SMD 100uF 10volts 20% D case Molded RoHS:否 制造商:AVX 電容:100 uF 電壓額定值:20 V ESR: 容差:10 % 外殼代碼 - in:2917 外殼代碼 - mm:7343 高度:4.1 mm 制造商庫存號:E Case 工作溫度范圍:- 55 C to + 125 C 系列:TBM 產品:Tantalum Solid Low ESR Commercial Grade 封裝:Bulk |
| 293D107X0010D2W | 制造商:VISHAY 制造商全稱:Vishay Siliconix 功能描述:Solid Tantalum Chip Capacitors TANTAMOUNT, Commercial, Surface Mount |
| 293D107X0010D2WE3 | 制造商:Vishay Sprague 功能描述:CAP 100UF 10VDC 20% 7.3 X 4.3 X 2.8MM SMD 7343-31 - Tape and Reel 制造商:Vishay Intertechnologies 功能描述:293D Series 100 uF 20 % 10 V Surface Mount Standard Molded Tantalum Capacitor 制造商:Vishay Intertechnologies 功能描述:Molded Tantalum Chip Capacitors |
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