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LTC2924IGN датащи(PDF) 10 Page - Linear Technology

номер детали LTC2924IGN
подробное описание детали  Quad Power Supply Sequencer
PDF  20 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LTC2924IGN датащи(HTML) 10 Page - Linear Technology

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LTC2924
10
2924fa
a Power On sequence (VON) and Off during a Power Off
sequence (VOFF).
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
A
B
ON
=
=
–
• .
– .
0 61
0 61
In the following example (Figure 5) IHYS is 50µA. This
corresponds to a RHYS resistor of:
R
V
A
k
HYS =
µ
=
Ω
0 5
50
10
.
In Figure 5, VON = 2.2V and VOFF = 1V. Using the equations
provided above:
R
V
V
A
k
R
k
V
V
V
k
B
A
=
µ
=
Ω
=
Ω
=
Ω
2 2
1
50
24
24
0 61
2 2
0 61
9 2
.
–
• .
.
– .
.
Hysteresis Voltage Check
After calculating the resistors RB and RA, check to make
sure the hystersis voltage at the ON and 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
= (
)
+
= (
)
Ω
Ω +
Ω
=
–
•
.
–
• .
.
.
For this example:
VHYS
2 2
1
9 2
9 2
24
0 33
which is greater than 4mV.
APPLICATIO S I FOR ATIO
Figure 5. Designing IHYS, Feedback Resistors
Figure 6. Typical Power Supply Sequencer
+–
IN
RB
VPS
RA
0.61V
IRB
VON = 2.2V
VOFF = 1V
IFB = IRB + IHYS
2924 F05
IHYS
IHYS
OUT1
OUT2
OUT3
OUT4
ON
DONE
FAULT
TMR
PGT
IN1
IN2
IN3
IN4
HYS/CFG
VCC
GND
LTC2924
150nF
2924 TA03
SYSTEM
CONTROLLER
150nF
POWER SUPPLY 4
POWER SUPPLY 3
POWER SUPPLY 2
POWER SUPPLY 1
VON ≥ 3.01V
VOFF ≤ 2.68V
VON ≥ 4.49V
VOFF ≤ 3.99V
VON ≥ 1.43V
VOFF ≤ 1.27V
VON ≥ 2.25V
VOFF ≤ 2V
33.2k
9.31k
24.9k
0.1
µF
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



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