LTC2913C(RevA) 데이터 시트보기 (PDF) - Linear Technology
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LTC2913C Datasheet PDF : 12 Pages
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LTC2913
APPLICATIONS INFORMATION
where RPD is the on-resistance of the internal pull-down
transistor, typically 50Ω at VCC > 1V and at room tem-
perature (25°C). CLOAD is the external load capacitance
on the pin. Assuming a 150pF load capacitance, the fall
time is 16.5ns.
The rise time on the UV and OV pins is limited by a 400k
pull-up resistance to VCC. A similar formula estimates the
output rise time (10% to 90%) at the UV and OV pins:
tRISE ≈ 2.2 • RPU • CLOAD
where RPU is the pull-up resistance.
OV Latch (LTC2913-1)
With the LATCH pin held low, the OV pin latches low when
an OV condition is detected. The latch is cleared by raising
the LATCH pin high. If an OV condition clears while LATCH
is held high, the latch is bypassed and the OV pin behaves
the same as the UV pin with a similar timeout period at the
output. If LATCH is pulled low while the timeout period is
active, the OV pin latches as before.
Disable (LTC2913-2)
The LTC2913-2 allows disabling the UV and OV outputs
via the DIS pin. Pulling DIS high will force both outputs
to remain weakly pulled high, regardless of any faults
that occur on the inputs. However, if a UVLO condition
occurs, UV asserts and pulls low, but the timeout function
is bypassed. UV pulls high as soon as the UVLO condition
is cleared.
DIS has a weak 2µA (typical) internal pull-down current
guaranteeing normal operation with the pin left open.
TYPICAL APPLICATIONS
Dual UV/OV Supply Monitor, 10% Tolerance, 5V, 3.3V
5V
POWER
SUPPLIES
3.3V
CBYP
0.1 F
RC1
44.2k
RB1
1k
RA1
4.53k
10
1
RC2
27.4k 2
3
RB2
1k 4
RA2
4.53k
VCC
VH1
LTC2913-1
VL1
OV 6
7
VH2
UV
VL2
GND
5
8
LATCH
TMR
9
CTMR
22nF
SYSTEM
2913 TA02
TIMEOUT = 200ms
Supply Monitor Powered from 12V, 10% Tolerance, 12V, 5V
12V
POWER
SUPPLIES 5V
RZ
10k
CBYP
0.1 F
RC1
115k
RB1
1k
RA1
4.53k
10
1 VH1 VCC TMR 9
RC2
44.2k 2
LTC2913-2
VL1
OV
6
3 VH2
7
UV
RB2
1k 4 VL2
8
DIS
RA2
GND
4.53k
5
SYSTEM
2913 TA03
2913fa
10
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