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參數(shù)資料
| 型號： | EL7566DREZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Monolithic 6 Amp DC-DC Step-Down Regulator |
| 中文描述： | 7.8 A SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | ROHS COMPLIANT, MO-153, HTSSOP-28 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 490K |
| 代理商： | EL7566DREZ |
11
FN7102.5
December 1, 2004
The V
TJ
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, T
ST
, is:
CASCADE START-UP
In this configuration, EN pin of Regulator 2 is connected to
the PG pin of Regulator 1 (Figure 22). V
O2
will only start
after V
O1
is good.
LINEAR START-UP
In the linear start-up tracking configuration, the regulator with
lower output voltage, V
O2
, tracks the one with higher output
voltage, V
O1
.
OFFSET START-UP
Compared with the cascade start-up, this configuration
allows Regulator 2 to begin the start-up process when V
O1
reaches a particular value of V
REF
*(1+R
B
/R
A
) before PG
goes HI, where V
REF
is the regulator reference voltage.
V
REF
=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 V
IN
and V
O
.
For long-term reliability, the input capacitor or combination of
capacitors must have the current rating higher than I
IN,RMS
.
Use X5R or X7R type ceramic capacitors, or SPCAP or
POSCAP types of Polymer capacitors for their high current
handling capability.
T
J
75
1.2
V
–
------------------------
+
=
T
ST
RC
V
O
V
IN
---------
=
V
IN
STP
V
O
-
+
STN
0.1μF
200K
V
O
T
ST
R
C
EL7566
FIGURE 21. ADJUSTABLE START-UP
EL7566
V
IN
EL7566
EN
PG
V
O2
V
O1
V
O2
V
O1
FIGURE 22. CASCADE START-UP
V
IN
STP
V
O1
V
IN
-
+
STN
C
R
-
+
V
O2
V
O1
V
O2
EL7566
EL7566
FIGURE 23. LINEAR START-UP TRACKING
V
IN
V
O1
-
+
V
IN
V
O2
V
REF
R
B
R
A
V
O1
V
O2
V
REF
(1+R
B
/R
A
)
EL7566
EL7566
FIGURE 24. OFFSET START-UP TRACKING
I
IN,RMS
V
V
IN
V
–
(
)
×
-----------------------------------------------
I
O
1/2
≈
×
I
(
O
)
=
EL7566
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