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LTC2925IGN bảng dữ liệu(PDF) 6 Page - Linear Technology

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LTC2925IGN bảng dữ liệu(HTML) 6 Page - Linear Technology

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LTC2925
6
2925f
FU CTIO AL BLOCK DIAGRA
10
µA
10
µA
VCC
2.6V
0.1V
–
+
RAMPBUF
FB3
TRACK3
GND
2925 FBD
1
×
VCC
10
12
9
(6)
REMOTE
17
(14)
10
STATUS
1
11
FB2
TRACK2
14
13
FB1
TRACK1
0.8V
VCC
+
–
15
16
+
–
10
µA
CHARGE
PUMP
SQ
0.1V
R
SCTMR
ON
4
(1)
PGTMR
10
µA
23
PGI
22
SCTMR
24
SDx
(15)
FAULT
(17)
(22)
(7, 25)
20
SENSEN
(24)
3
SENSEP
(23)
2
SDTMR
(2)
5
GATE
(16)
19
RAMP
18
VCC
1.2V
GATE
GATE > RAMP + 4.9V
4.9V
1.2V
0.4V
ONSIG
–
+
1.2V
1.2V
SQ
R
2
µA
50
µA
50mV
SENSEP > SENSEN + 50mV
(8)
(10)
(13)
(9)
(11)
(12)
(20)
(19)
(21)
VCC
VCC
VCC
Pin numbers in parentheses are for the UF package.
PI FU CTIO S GN/UF Packages
SCTMR (Pin 24/Pin 21): Circuit Breaker Timer. A capaci-
tor from SCTMR to GND programs the maximum time that
a short circuit can be sustained before GATE is pulled low.
When (SENSEP – SENSEN) > 50mV, SCTMR will pull up
with 50
µA, otherwise it pulls down with 2µA. When the
voltage at SCTMR exceeds 1.23V, the GATE will be pulled
to ground with 20mA and the FAULT pin will be pulled low.
The circuit breaker function is reset by pulling ON below
0.4V. The GATE pin will not rise again until SCTMR has
been pulled below 100mV by the 2
µA current source. If
FAULT is tied back to ON the system will automatically
retry after a fault. Tie SCTMR to GND if the circuit breaker
is not used.



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