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EL7583 Schematic ( PDF Datasheet ) - Intersil Corporation

Teilenummer EL7583
Beschreibung 3-Channel DC-DC Converter
Hersteller Intersil Corporation
Logo Intersil Corporation Logo 




Gesamt 15 Seiten
EL7583 Datasheet, Funktion
®
Data Sheet
July 24, 2003
EL7583
FN7335.2
3-Channel DC-DC Converter
The EL7583 is a 3-channel DC-DC
converter IC which is designed
primarily for use in TFT/LCD
applications. It features a PWM boost converter with 2.7V to
14V input capability and 5V to 17V output, which powers the
column drivers and provides up to 470mA @ 12V, 370mA @
15V from 5V supply. A pair of charge pump control circuits
provide regulated outputs of VON and VOFF supplies at 8V
to 40V and -5V to -40V, respectively, each at up to 60mA.
The EL7583 features adjustable switching frequency,
adjustable soft start, and a separate output VON enable
control to allow selection of supply start-up sequence. An
over-temperature feature is provided to allow the IC to be
automatically protected from excessive power dissipation.
The EL7583 is available in a 20-pin TSSOP package and is
specified for operation over the full -40°C to +85°C
temperature range.
Ordering Information
PART
NUMBER
EL7583IR
EL7583IR-T7
EL7583IR-T13
PACKAGE
20-Pin TSSOP
20-Pin TSSOP
20-Pin TSSOP
TAPE &
REEL
-
7”
13”
PKG. DWG. #
MDP0044
MDP0044
MDP0044
Features
• TFT/LCD display supply
- Boost regulator
- VON charge pump
- VOFF charge pump
• 2.7V to 14V VIN supply
• 5V < VBOOST < 17V
• 5V < VON < 40V
• -40V < VOFF < 0V
• VBOOST = 12V @ 470mA
• VBOOST = 15V @ 370mA
• High frequency, small inductor DC-DC boost circuit
• Over 90% efficient DC-DC boost converter capability
• Adjustable frequency
• Adjustable soft-start
• Adjustable outputs
• Small parts count
Applications
• TFT-LCD panels
• PDAs
Pinout
EL7583
(20-PIN TSSOP)
TOP VIEW
VSSB 1
SS 2
FBB 3
VDDB 4
LX 5
LX 6
LX 7
DRVN 8
VDDN 9
FBN 10
20 ROSC
19 ENP
18 ENBN
17 VREF
16 PGND
15 PGND
14 DRVP
13 VDDP
12 FBP
11 VSSP
REFER TO PCB LAYOUT GUIDELINE
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 © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc.
All other trademarks mentioned are the property of their respective owners.






EL7583 Datasheet, Funktion
EL7583
Typical Performance Curves (Continued)
f=675kHz, VIN=5.0V
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
0
18V 15V 12V
9V
100 200 300 400 500 600 700
IOUT (mA)
FIGURE 7. LOAD REGULATION vs IOUT
f=675kHz, VIN=3.3V
1.5
1.0
0.5
0.0
-0.5
15V
-1.0 12V
18V
9V
5V
-1.5
0
100 200 300 400 500 600 700 800
IOUT (mA)
FIGURE 8. LOAD REGULATION vs IOUT
f=1MHz, VIN=5.0V
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
0
18V 12V
15V
9V
100 200 300 400 500 600 700
IOUT (mA)
FIGURE 9. LOAD REGULATION vs IOUT
f=1MHz, VIN=3.3V
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
0
15V 12V
18V
9V
5V
100 200 300 400 500 600 700 800
IOUT (mA)
FIGURE 10. LOAD REGULATION vs IOUT
20
19 VDDP = 15V
18
VDDP = 12V
17
16
15
14
0 10
20 30 40 50
60 70 80
ILOAD (mA)
FIGURE 11. VON vs ION
6
6.5
6
VDDN = 12V
5.5
VDDN = 15V
5
4.5
4
3.5
0 10
20 30 40 50
60 70 80
ILOAD (mA)
FIGURE 12. VOFF vs IOFF

6 Page









EL7583 pdf, datenblatt
EL7583
Two-Stage Positive Charge Pump Circuit
VDDP
RONP
DRNP
RONN
VSSP
- FBP
+
1.265V
+
-
CCPP
VBOOST
(5V-17V)
COUT1
VLX
CCPP
COUT1
VON
R12
R11
The maximum VON output voltage for N+1 stage charge pump is:
VON(max)
2
×
VDDP
-
IOUT
×
2
×
(RONN
+
RONP )
-
2
×
VDIODE
-
IOUT
×
---------------------1----------------------
0.5 × FS × CCPP
-
IOUT
×
-----------------------1------------------------
0.5 × FS × COUT1
+
N
×
VLX(max)
-
N
×
2
×
VDIODE
+
IOUT
×
---------------------1----------------------
0.5 × FS × CCPP
+
IOUT
×
-0---.--5----×-----F----S----1-×-----C----O-----U----T----1- 
R11 and R12 set the VON output voltage:
VON
=
VFBP
×
R-----1---1----+-----R-----1---2-
R11
where VFBP is 1.310V.
Negative Charge Pump Design Considerations
The criteria for the negative charge pump is similar to the
positive charge pump. For a single stage charge pump, the
maximum VOFF output voltage is:
VOFF(max)
IOUT
×
2
×
(RONN
+
RONP )
+
2
×
VDIODE
-
IOUT
×
---------------------1-----------------------
0.5 × FS × CCPN
-
IOUT
×
-----------------------1------------------------
0.5 × FS × COUT2
-
VDDN
Similar to positive charge pump, if additional stage is
required, the LX switching signal is recommended to drive
the additional charge pump diodes. The figure on the next
page shows a two stage negative charge pump circuit.
12

12 Page





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