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參數(shù)資料
| 型號(hào)： | LT1640LCS8#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 4/16頁(yè) |
| 文件大?。?/td> | 187K |
| 代理商： | LT1640LCS8#TRPBF |
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12
LT1640L/LT1640H
1640lhfb
The new threshold voltage when the input moves from low
to high is:
VV
R
RR
UV LH
UVH
,
=
++
2
3
13
12
23
where VUVH is typically 1.243V.
The new threshold voltage when the input moves from
high to low is:
VV
R
RR
V
R
UV HL
UVL
GATE
,
–
=
++
2
3
13
12
23
1
3
where VUVL is typically 1.223V.
The new hysteresis value will be:
VV
R
RR
V
R
HYS
UVHY
GATE
=
++
+
2
3
13
12
23
1
3
With R1 = 562k, R2 = 16.9k and R3 = 1.62M, VGATE = 13.5V
and VUVHY = 20mV, the undervoltage threshold will be 43V
(from low to high) and 37.6V (from high to low). The
hysteresis is 5.4V. A separate resistor divider should be
used to set the overvoltage threshold given by:
APPLICATIONS INFORMATION
WU
U
VV
RR
R
OV
OVH
=
+
45
5
With R4 = 506k, R5 = 8.87k and VOVH = 1.223V, the
overvoltage threshold will be 71V.
PWRGD/PWRGD Output
The PWRGD/PWRGD output can be used to directly en-
able a power module when the input voltage to the module
is within tolerance. The LT1640L has a PWRGD output for
modules with an active low enable input, and the LT1640H
has a PWRGD output for modules with an active high
enable input.
When the DRAIN voltage of the LT1640H is high with
respect to VEE (Figure 11), the internal transistor Q3 is
turned off and R7 and Q2 clamp the PWRGD pin one diode
drop (
≈0.7V) above the DRAIN pin. Transistor Q2 sinks
the module’s pull-up current and the module turns off.
When the DRAIN voltage drops below VPG, Q3 will turn on,
shorting the bottom of R7 to DRAIN and turning Q2 off.
The pull-up current in the module then flows through R7,
pulling the PWRGD pin high and enabling the module.
+
VEE
VDD
LT1640H
SENSE
C1
C3
Q1
R2
R3
C2
R4
R5
R6
R1
4
3
2
OV
GND
– 48V
UV
56
8
1
7
GATE
1640 F11
PWRGD
DRAIN
VEE
R7
6.5k
Q2
–
+
VPG
Q3
ACTIVE HIGH
ENABLE MODULE
VOUT
+
VOUT
–
VIN
+
VIN
–
ON/OFF
GND
(SHORT PIN)
*
* DIODES INC. SMAT70A
2
× 1N4148
4
3
2
1
+
–
Figure 11. Active High Enable Module
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