廬
Using the EL7515 Demo Board
Technical Brief
June 7, 2004
TB429
The complete schematic of EL7515
demo board is shown in Figure 1. With
different components stuffed, this
demo board can easily be configured into the applications
shown in this technical brief. The standard demo board
being sent out is the complete 5V to 12V converter shown in
Figure 2, which occupies less than 0.4 in
2
area with
components on top side only. Layout diagrams are given at
the end of this document.
1. V
IN
= 2V-5.5V. Can be higher with higher voltage rated
C
1
2. V
O
= 12V. Can be set according to the following formula:
R
2
錚?/div>
錚?/div>
V
O
=
V
FB
脳 錚?/div>
1
+
------
錚?/div>
-
R
1
錚?/div>
錚?/div>
3. I
O
- up to 600mA depending on input voltage, provided
that diode and inductor can handle the corresponding
currents (refer to data sheet for the chart)
4. Switching frequency - can be set by R
3
5. R
4
can be 10鈩?- 51鈩?if V
O
is less than 10V. If V
O
is larger
than 12V, it can be calculated by:
V
O
鈥?/div>
10
-
R
4
=
--------------------
I
DD
where I
DD
is a function of switching frequency, as shown
in the I
DD
vs F
S
curve.
where V
FB
is shown in the V
FB
vs V
DD
curve.
C
21
V
O4
D
21
C
14
V
O3
D
12
C
11
V
O2
D
11
L
1
V
IN
C
1
1 PGND
2 SGND
R
3
R
6
R
7
5 LBI
R
8
LBO 6
LBO
EN
4 EN
SS 7
3 RT
LX 10
VDD 9
FB 8
C
3
R
1
C
7
C
4
R
2
R
9
R
4
C
5
C
6
C
8
D
1
C
12
C
13
V
O1
Q
1
L
2
V
O11
C
15
C
22
FIGURE 1. COMPLETE SCHEMATIC OF EL7515 DEMO BOARD
L
1
V
IN
C
1
1 PGND
R
6
R
3
2 SGND
3 RT
4 EN
5 LBI
LX 10
VDD 9
FB 8
C
3
SS 7
LBO 6
R
1
C
10
C
4
R
2
R
4
C
5
C
6
D
1
V
O1
FIGURE 2. 5V TO 12V CONVERTER
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 321-724-7143
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright 漏 Intersil Americas Inc. 2004. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.
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