EL7585AILZ(2005) 查看數據表（PDF） - Intersil
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EL7585AILZ Datasheet PDF : 18 Pages
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EL7585A
FBB
CINT
DRVN
FBN
VREF REFERENCE
OSCILLATOR
SLOPE COMP OSC
COMPENSATION
GM
AMPLIFIER
Σ
VOLTAGE
AMPLIFIER
PWM
LOGIC
CONTROLLER
BUFFER
UVLO
COMPARATOR
THERMAL
SHUTDOWN
SHUTDOWN
& START-UP
CONTROL
CURRENT
AMPLIFIER
CURRENT REF
CURRENT
LIMIT COMPARATOR SS
VREF
+
-
UVLO
COMPARATOR
BUFFER
SS
+ 0.2V
-
SS
VREF
+
-
0.4V
UVLO
COMPARATOR
UVLO
COMPARATOR
BUFFER
BUFFER
LX
PGND
DRVP
FBP
DRVL
FBL
FIGURE 20. BLOCK DIAGRAM
Applications Information
The EL7585A 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 (VON, VOFF, and VLOGIC) with multiple
protection functions. A block diagram is shown in Figure 20.
Table 1 lists the recommended components.
The EL7585A integrates an N-channel MOSFET boost
converter to minimize external component count and cost.
The AVDD, VON, VOFF, and VLOGIC output voltages are
independently set using external resistors. VON, VOFF
voltages require external charge pumps which are post
regulated using the integrated LDO controllers.
TABLE 1. RECOMMENDED COMPONENTS
DESIGNATION
DESCRIPTION
C1, C2, C3 10µF, 16V X5R ceramic capacitor (1206)
TDK C3216X5R0J106K
C20, C31
4.7µF, 25V X5R ceramic capacitor (1206)
TDK C3216X5R1A475K
TABLE 1. RECOMMENDED COMPONENTS (Continued)
DESIGNATION
DESCRIPTION
D1
1A 20V low leakage Schottky rectifier (CASE 457-
04) ON SEMI MBRM120ET3
D11, D12, D21 200mA 30V Schottky barrier diode (SOT-23)
Fairchild BAT54S
L1
6.8µH 1.3A Inductor
TDK SLF6025T-6R8M1R3-PF
Q1
-2.4 -20V P-channel 1.8V specified PowerTrench
MOSFET (SuperSOT-3) Fairchild FDN304P
Q4
-2A -30V single P-channel logic level PowerTrench
MOSFET (SuperSOT-3) Fairchild FDN360P
Q3
200mA 40V PNP amplifier (SOT-23)
Fairchild MMBT3906
Q2
200mA 40V NPN amplifier (SOT-23)
Fairchild MMBT3904
Q5
1A 30V PNP low saturation amplifier (SOT-23)
Fairchild FMMT549
8
FN7523.2
September 21, 2005
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