參數(shù)資料
型號： LTC2924
廠商： Linear Technology Corporation
英文描述： Quad Power Supply Sequencer
中文描述： 四路電源排序器
文件頁數(shù)： 10/16頁
文件大?。?/td> 190K
代理商： LTC2924
LTC2924
10
2924f
sequence (V
ON
) and Off during a Power Off sequence
(V
OFF
).
Referring to Figures 5 and 6, each set of resistors can then
be calculated by:
R
V
V
I
R
R
V
V
V
B
ON
OFF
HYS
0 61
–0 61
A
B
ON
=
=
–
In the following example (Figure 5) I
HYS
is 50
μ
A. This
corresponds to a R
HYS
resistor of:
Figure 5. Designing I
HYS
, Feedback Resistors
Figure 6. Typical Power Supply Sequencer
R
V
A
k
HYS
=
μ
=
0 5
50
10
.
In Figure 5, V
ON
= 2.2V and V
OFF
= 1V. Using the equations
provided above:
R
V
V
A
0 61
–0 61
k
R
k
V
V
V
k
B
A
=
μ
=
=
=
2 2
.
1
50
24
24
2 2
.
9 2
.
–
Hysteresis Voltage Check
After calculating the resistors R
B
and R
A
, check to make
sure the hystersis voltage at the IN1-IN4 pins is greater
than 4mV. Use the following equation:
V
V
V
R
R
R
V
.
V
k
k
k
V
HYS
ON
OFF
+
A
A
B
=
(
)
=
(
)
+
=
–
.
–
9 2
24
.
For this example:
V
which is greater than 4mV.
HYS
2 2
1
9 2
0 33
+
IN
R
B
V
PS
R
A
0.61V
I
RB
V
ON
= 2.2V
V
OFF
= 1V
I
FB
=
I
RB
+
I
HYS
2924 F05
I
HYS
I
HYS
OUT1
OUT2
OUT3
OUT4
ON
DONE
FAULT
TMR
PGT
IN1
IN2
IN3
IN4
HYS/CFG
V
CC
GND
LTC2924
150nF
2924 TA03
SYSTEM
CONTROLLER
150nF
POWER SUPPLY 4
POWER SUPPLY 3
POWER SUPPLY 2
POWER SUPPLY 1
V
ON
≥
3.01V
V
OFF
≤
2.68V
V
ON
≥
4.49V
V
OFF
≤
3.99V
V
ON
≥
1.43V
V
OFF
≤
1.27V
V
ON
≥
2.25V
V
OFF
≤
2V
33.2k
9.31k
24.9k
0.1
μ
F
15.8k
49.9k
11.81k
7.87k
8.45k
49.9k
2.5V
SHDN
1.6V
SHDN
5V
SHDN
3.3V
SHDN
10k
5V EARLY*
10k
*5V EARLY MUST BE ON BEFORE
SEQUENCING SUPPLIES
APPLICATIOU
W
U
U
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