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参数资料
| 型号： | LTC2912HDDB-3#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封装： | 3 X 2 MM, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件页数： | 2/12页 |
| 文件大小： | 168K |
| 代理商： | LTC2912HDDB-3#PBF |
LTC2912
10
2912fa
TYPICAL APPLICATIONS
APPLICATIONS INFORMATION
The rise time on the UV, OV and 0V pins is limited by a
400k pull-up resistance to VCC. A similar formula esti-
mates the output rise time (10% to 90%) at the UV, OV
and OV pins:
tRISE ≈ 2.2 RPU CLOAD
where RPU is the pull-up resistance.
OV/OV Latch (LTC2912-1, LTC2912-3)
With the LATCH pin held low, the OV pin latches low
(LTC2912-1) and the OV pin latches high (LTC2912-3)
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 and OV pins behave 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 and OV pins
latch as before.
Disable (LTC2912-2)
The LTC2912-2 allows disabling the UV and OV outputs
via the DIS pin. Pulling DIS high forces both outputs to
remain weakly pulled high, regardless of any faults that
occur on the inputs. However, if a UVLO condition oc-
curs, 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.
Dual UV/OV Supply Monitor, 3.3V ±10% Tolerance
48V Supply Monitor (<±10% = Powergood)
Dual UV Supply Monitor, 3.3V, 2.5V, 10% Tolerance
RB
1k
RC
27.4k
VH
1
6
7
2
3
8
4
5
VL
GND
TMR
SYSTEM
POWER
SUPPLY
OV
UV
2912 TA02
LATCH
CTMR
22nF
TIMEOUT = 200ms
RA
4.53k
VCC
LTC2912-1
CBYP 0.1μF
3.3V
RB
80.6k
RC
37.4M
RZ
200k
RPG
30k
POWERGOOD
LED
VH
1
6
7
2
3
8
4
5
VL
GND
TMR
POWER
SUPPLY
OV
UV
2912 TA03
DIS
RA
357k
CTMR
10nF
TIMEOUT = 85ms
VCC
LTC2912-2
CBYP
0.1μF
48V
RA1
11k
RB1
54.9k
RB2
39.2k
ROV
10k
VH
1
6
7
2
3
8
4
5
VL
GND
TMR
SYSTEM
POWER
SUPPLIES
OV
UV
2912 TA04
DIS
RA2
11k
VCC
LTC2912-2
CBYP 0.1μF
2.5V
3.3V
RUV
10k
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相关代理商/技术参数 |
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