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EL7566AIREZ-T7 Datasheet(PDF) 11 Page - Intersil Corporation

Part # EL7566AIREZ-T7
Description  Monolithic 6A DC/DC Step-Down Regulator
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Manufacturer  INTERSIL [Intersil Corporation]
Direct Link  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

EL7566AIREZ-T7 Datasheet(HTML) 11 Page - Intersil Corporation

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11
FN7102.7
May 8, 2006
The VTJ pin reports a voltage proportional to the junction
temperature. Equation 3 illustrates the relationship and can
be used to accurately evaluate thermal design points.
Full Start-Up Control
The EL7566 offers full start-up control. The core of this
control is a start-up comparator in front of the main PWM
controller. The STP and STN are the inputs to the
comparator, whose HI output forces the PWM comparator to
skip switching cycles. The user can choose any of the
following control configurations:
ADJUSTABLE SOFT-START
In this configuration, the ramp-up time is adjustable to any
time longer than the building soft-start time of 2ms. The
approximate ramp-up time, TST, is:
CASCADE START-UP
In this configuration, EN pin of Regulator 2 is connected to
the PG pin of Regulator 1 (Figure 22). VO2 will only start
after VO1 is good.
LINEAR START-UP
In the linear start-up tracking configuration, the regulator with
lower output voltage, VO2, tracks the one with higher output
voltage, VO1.
OFFSET START-UP
Compared with the cascade start-up, this configuration
allows Regulator 2 to begin the start-up process when VO1
reaches a particular value of VREF*(1+RB/RA) before PG
goes HI, where VREF is the regulator reference voltage.
VREF=1.26.
Component Selection
INPUT CAPACITOR
The main functions of the input capacitor(s) are to maintain
the input voltage steady and to filter out the pulse current
passing through the upper switch. The root-mean-square
value of this current is:
for a wide range of VIN and VO.
For long-term reliability, the input capacitor or combination of
capacitors must have the current rating higher than IIN,RMS.
Use X5R or X7R type ceramic capacitors, or SPCAP or
POSCAP types of Polymer capacitors for their high current
handling capability.
TJ
75
1.2 VTJ
0.00384
------------------------
+
=
TST
RC
VO
VIN
---------
⎝⎠
⎜⎟
⎛⎞
=
VIN
STP
VO
-
+
STN
0.1µF
200K
VO
TST
R
C
EL7566
FIGURE 21. ADJUSTABLE START-UP
EL7566
VIN
EL7566
EN
PG
VO2
VO1
VO2
VO1
FIGURE 22. CASCADE START-UP
VIN
STP
VO1
-
+
STN
C
R
-
+
VIN
VO2
VO1
VO2
EL7566
EL7566
FIGURE 23. LINEAR START-UP TRACKING
VIN
VO1
-
+
VIN
VO2
VREF
RB
RA
VO1
VO2
VREF(1+RB/RA)
EL7566
EL7566
FIGURE 24. OFFSET START-UP TRACKING
IIN,RMS
VO VIN VO
()
×
VIN
-----------------------------------------------
IO 1/2
×
I
( O)
=
EL7566


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