參數(shù)資料
型號(hào)： T1074HV
廠商： Linear Technology Corporation
英文描述： BOX EXTRUD ALUM 8.66X6.30X1.20,1
中文描述： 降壓型開關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 10/16頁(yè)
文件大?。?/td> 215K
代理商： T1074HV
LT1074/LT1076
10
Figure 5. Shutdown Circuitry
Figure 6. Undervoltage Lockout
Figure 7. Adding Hysteresis
DESCRIPTIO S
PI
U
Undervoltage Lockout
Undervoltage lockout point is set by R1 and R2 in Figure6.
To avoid errors due to the 10
μ
A shutdown pin current, R2
is usually set at 5k, and R1 is found from:
(
R
R
V
V
V
TP
SH
SH
1
2
=
)
V
TP
= Desired undervoltage lockout voltage
V
SH
= Threshold for lockout on the
shutdown pin = 2.45V
If quiescent supply current is critical, R2 may be increased
up to 15k
, but the denominator in the formula for R2
should replace V
SH
with V
SH
– (10
μ
A)(R2).
–
+
C1
10 A
300 A
–
+
SHUTDOWN
PIN
C2
V
IN
I
PIN
6V
Q1
TO TOTAL
REGULATOR
SHUTDOWN
2.3V
0.3V
LT1074PD07
EXTERNAL
C
LIM
Hysteresis in undervoltage lockout may be accomplished
by connecting a resistor (R3) from the I
LIM
pin to the
shutdown pin as shown in Figure 7. D1 prevents the
shutdown divider from altering current limit.
LT1074PD08
R1
R2
5k
V
SHUT
GND
IN
LT1074
LT1074PD09
R1
R2
R3
V
SHUT
I
LIM
IN
LT1074
OPTIONAL CURRENT
LIMIT RESISTOR
D1*
*1N4148
TripPo
V
V
R
R
TP
int
.
=
=
+
2 35
1
1
2
If R3 is added, the lower trip point (V
IN
descending) will be
the same. The upper trip point (V
UTP
) will be:
V
V
R
R
R
R
VR
R
UTP
SH
=
+
11
2
1
3
0 8
.
1
3
If R1 and R2 are chosen, R3 is given by:
R
V
V R
V
V
R
R
SH
UTP
SH
3
0 8
.
1
1
1
2
=
(
+
Example:
An undervoltage lockout is required such that
the output will not start until V
IN
= 20V, but will continue
to operate until V
IN
drops to 15V. Let R2 = 2.32k.
R
k
V
2.
.
V
V
.
k
R
k
1
2 34
(
15
(
2 35
.
12 5
3
2 35 0 8 12 5
20 2 35 1
12 5
2 32
.
3 9
.
=
(
)
)
=
=
)
+
=
.
.
.
.
.
相關(guān)PDF資料
PDF描述
T10A100 MICROMATE FEMALE PCB EDGEMT. RoHS Compliant: Yes
T10A200 RF Coaxial Connector Adapter; Body Material:Brass; Body Style:Straight Bulkhead Adapter, Jack-Jack; Impedance:50ohm; Leaded Process Compatible:Yes; Series:N; Contact Termination:Clamp/Solder; Frequency Max:11GHz RoHS Compliant: Yes
T10A BOX EXTRUD ALUM 8.66X6.30X2.03,1
T10A062 Glass passivated junction
T10A068 Glass passivated junction
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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T-1075 制造商:RHOMBUS-IND 制造商全稱:Rhombus Industries Inc. 功能描述:FLYBACK TRANSFORMER
T1075-0001 制造商:Amphenol Commercial 功能描述:SFP 1X1 CAGE EXTRACTION TOOL
T1075-0002 制造商:Amphenol Commercial 功能描述:SFP 2X1 CAGE EXTRACTION TOOL
T1075-0003 制造商:Amphenol Commercial 功能描述:SFP 2X1 CONNR EXTRACTION TOOL
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