el7520a Intersil Corporation, el7520a Datasheet - Page 9

• Manufacturer Part Number: el7520a
• Description: 4-channel Dc/dc Controller
• Manufacturer: Intersil Corporation

Typical Application
Applications Information
The EL7520 and EL7520A provide a multiple output power
supply solution for TFT-LCD applications. The system
consists of a high efficiency boost controller and three low
cost linear-regulator controllers (V
The block diagram of the whole part is shown in Figure 24.
Table 1 lists the recommended components.
NODE 1
C1, C2, C3, C31
DESIGNATION
D11, D12, D21
V
2.5V
LGC
V
IN
C20
C15
D1
L1
0.1µF
C
Q
C
10
TABLE 1. RECOMMENDED COMPONENTS
31
31
10µF
C
41
R
500Ω
500kΩ
43
R
10µF, 16V, X7R ceramic capacitor (1206)
TDK C3216X7R1C106M
4.7µF, 16V X5R ceramic capacitor (1206)
TDK C3216X5R1A475K
1µF, 25V X7R ceramic capacitor (1206)
TDK C3216X7R1E105K
1A 20V low leakage schottky rectifier (CASE
457-04) ON SEMI MBRM120ET3
200mA 30V schottky barrier diode (SOT-23)
Fairchild BAT54S
6.8mH 1.3A inductor
TDK SLF6025T-6R8M1R3-PF
0.1µF
0
21.7K
R
Q
42
1
R
V
41
REF
10K
C
10Ω
R
R
0
6
7
C
20K
9
6
1000pF
0.1µF
DESCRIPTION
4.7µF
ON
0.1µF
NODE 1
C
C
, V
7
1
C
22
OFF
10µFx2
SGND
PG
VDDP
CDELAY
VDD
EN
VREF
VREF
DRVL
FBL
, and V
L
1
6.8µH
DRVB
DRVP
DRVN
DELB
PGND
ISAD
CINT
LOGIC
FBB
FBP
FBN
ISIN
EL7520, EL7520A
20K
20K
).
V
REF
R
R
11
21
104K
230K
200K
R
R
R
R
R
7K
3K
12
13
23
20
22
C
LX
23
Q
11
Q
C
1µF
2.2nF
2
DESIGNATION
15
Q
C
4.7µF
21
20K
TABLE 1. RECOMMENDED COMPONENTS (Continued)
R
20
D
16
1
Q11
Q21
Q31
Q1
Q2
Q3
C
C
0.1µF
0.1µF
10µF
14
25
C
3
R
62.5K
R
7.5K
2
1
D
D
12
21
C
-2.4 -20V P-channel 1.8V specified
PowerTrench MOSFET (SuperSOT-3)
Fairchild FDN304P
6.3A 30V single N-channel logic level
PowerTrench MOSFET (SOT-23)
Fairchild FDC655AN
-2A –30V single P-channel logic level
PowerTrench MOSFET (SuperSOT-3)
Fairchild FDN360P
200mA 40V PNP amplifier (SOT-23)
Fairchild MMBT3906
200mA 40V NPN amplifier (SOT-23)
Fairchild MMBT3904
1A 30V PNP low saturation amplifier (SOT-23)
Fairchild FMMT549
0.1µF
C
24
13
C
10µF
2
0.1µF
R
1MΩ
9
0.1µF
C
LX
12
LX
C
0.01µF
DESCRIPTION
16
D
11
C
0.1µF
11
Q
3
10K
R
8
C
0.1µF
9
July 12, 2005
12V
V
FN7318.0
20V
-8V
BOOST
V
V
ON
OFF