EL7585 INTERSIL [Intersil Corporation], EL7585 Datasheet - Page 8

• Manufacturer Part Number: EL7585
• Description: TFT-LCD Power Supply
• Manufacturer: INTERSIL [Intersil Corporation]

Applications Information
The EL7585 is a highly integrated multiple output power
solution for TFT-LCD applications. The system consists of
one high efficiency boost converter and three linear-
regulator controllers (V
protection functions. A block diagram is shown in Figure 20.
Table 1 lists the recommended components.
The EL7585 integrates an N-channel MOSFET boost
converter to minimize external component count and cost.
The A
independently set using external resistors. V
voltages require external charge pumps which are post
regulated using the integrated LDO controllers.
DESIGNATION
C
C
1
20
, C
VDD
, C
2
, C
31
TABLE 1. RECOMMENDED COMPONENTS
, V
3
ON
10µF, 16V X5R ceramic capacitor (1206)
TDK C3216X5R0J106K
4.7µF, 25V X5R ceramic capacitor (1206)
TDK C3216X5R1A475K
, V
OFF
DRVN
C
FBB
FBN
, and V
ON
INT
, V
OFF
LOGIC
8
BUFFER
DESCRIPTION
, and V
V
SHUTDOWN
THERMAL
REF
output voltages are
COMPARATOR
AMPLIFIER
0.4V
LOGIC
REFERENCE
GM
UVLO
COMPARATOR
ON
) with multiple
UVLO
, V
SS
+
-
COMPENSATION
OFF
FIGURE 20. BLOCK DIAGRAM
0.2V
& START-UP
AMPLIFIER
SHUTDOWN
VOLTAGE
CONTROL
SLOPE
COMPARATOR
EL7585
OSCILLATOR
V
UVLO
Σ
REF
COMP
LIMIT COMPARATOR
AMPLIFIER
CURRENT
COMPARATOR
CONTROLLER
DESIGNATION
D
CURRENT
LOGIC
UVLO
PWM
11
OSC
TABLE 1. RECOMMENDED COMPONENTS (Continued)
SS
, D
+
-
Q
Q
Q
Q
Q
D
L
12
1
1
1
4
3
2
5
V
, D
REF
CURRENT REF
21
1A 20V low leakage Schottky rectifier (CASE 457-
04) ON SEMI MBRM120ET3
200mA 30V Schottky barrier diode (SOT-23)
Fairchild BAT54S
6.8µH 1.3A Inductor
TDK SLF6025T-6R8M1R3-PF
-2.4 -20V P-channel 1.8V specified PowerTrench
MOSFET (SuperSOT-3) Fairchild FDN304P
-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
BUFFER
SS
+
-
BUFFER
BUFFER
DESCRIPTION
LX
PGND
DRVP
FBP
DRVL
FBL
July 1, 2005
FN7345.1