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EL7586AILZ-T7 Datasheet(PDF) 9 Page - Intersil Corporation

Part # EL7586AILZ-T7
Description  TFT-LCD Power Supply
Download  21 Pages
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL7586AILZ-T7 Datasheet(HTML) 9 Page - Intersil Corporation

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9
FN9210.2
January 17, 2006
Applications Information
The EL7586 and EL7586A provide a high 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 25. Table 1 lists the recommended components.
The EL7586, and EL7586A integrate 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.
Boost Converter
The main boost converter is a current mode PWM converter
at a fixed frequency of 1MHz which enables the use of low
profile inductors and multiplayer ceramic capacitors. This
results in a compact, low cost power system for LCD panel
design.
The EL7586 and EL7586A are designed for continuous
current mode, but they can also operate in discontinuous
current mode at light load. In continuous current mode,
current flows continuously in the inductor during the entire
switching cycle in steady state operation. The voltage
conversion ratio in continuous current mode is given by:
Where D is the duty cycle of the switching MOSFET.
Figure 26 shows the block diagram of the boost regulator. It
uses a summing amplifier architecture consisting of GM
stages for voltage feedback, current feedback and slope
compensation. A comparator looks at the peak inductor
current cycle by cycle and terminates the PWM cycle if the
current limit is reached.
An external resistor divider is required to divide the output
voltage down to the nominal reference voltage. Current
drawn by the resistor network should be limited to maintain
the overall converter efficiency. The maximum value of the
resistor network is limited by the feedback input bias current
and the potential for noise being coupled into the feedback
pin. A resistor network in the order of 60k
 is recommended.
The boost converter output voltage is determined by the
following equation:
The current through the MOSFET is limited to 2A peak for
the EL7586. This restricts the maximum output current
based on the following equation:
Where
IL is peak to peak inductor ripple current, and is set
by:
where fS is the switching frequency.
TABLE 1. RECOMMENDED COMPONENTS
DESIGNATION
DESCRIPTION
C1, C2, C3
10µF, 16V X7R ceramic capacitor (1206)
TDK C3216X7RIC106M
C20, C31
4.7µF, 25V X5R ceramic capacitor (1206)
TDK C3216X5R1A475K
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
A
VDD
V
IN
----------------
1
1D
-------------
=
A
VDD
R
1
R
2
+
R
1
---------------------
V
REF
=
I
OMAX
I
LMT
I
L
2
--------

 VIN
V
O
---------
=
I
L
V
IN
L
---------
D
f
S
-----
=
EL7586, EL7586A


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