參數(shù)資料
型號(hào)： LT1074HVIT7#35
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 8.5 A SWITCHING REGULATOR, 125 kHz SWITCHING FREQ-MAX, PZFM7
封裝： PLASTIC, TO-220, 7 PIN
文件頁數(shù)： 2/17頁
文件大?。?/td> 201K
代理商： LT1074HVIT7#35
LT1074/LT1076
10
sn1074 1074fds
Figure 5. Shutdown Circuitry
Figure 6. Undervoltage Lockout
Figure 7. Adding Hysteresis
DESCRIPTIO S
U
PI
U
Undervoltage Lockout
Undervoltage lockout point is set by R1 and R2 in Figure 6.
To avoid errors due to the 10
A shutdown pin current, R2
is usually set at 5k, and R1 is found from:
RR
VV
V
TP
SH
12
=
()
VTP = Desired undervoltage lockout voltage
VSH = 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 VSH with VSH – (10A)(R2).
–
+
C1
10 A
300 A
–
+
SHUTDOWN
PIN
C2
VIN
I
PIN
6V
Q1
TO TOTAL
REGULATOR
SHUTDOWN
2.3V
0.3V
LT1074PD07
LIM
EXTERNAL
CLIM
Hysteresis in undervoltage lockout may be accomplished
by connecting a resistor (R3) from the ILIM 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
ILIM
IN
LT1074
OPTIONAL CURRENT
LIMIT RESISTOR
D1*
*1N4148
Trip Po
V
R
TP
int
.
==
+
235
1
2
If R3 is added, the lower trip point (VIN descending) will be
the same. The upper trip point (VUTP) will be:
VV
R
V
R
UTP
SH
=+
1
2
1
3
08
1
3
.
If R1 and R2 are chosen, R3 is given by:
R
VV R
VV
R
SH
UTP
SH
3
08
1
2
=
()( )
+
.
Example: An undervoltage lockout is required such that
the output will not start until VIN = 20V, but will continue
to operate until VIN drops to 15V. Let R2 = 2.32k.
Rk
VV
V
k
Rk
12 34
15
2 35
235
12 5
3
235 0 8 125
20 2 35 1
12 5
232
39
=
()
()
=
()( )
+
=
.
..
.
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