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参数资料
| 型号： | LTC4416IMS#TR |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10 |
| 封装： | PLASTIC, MSOP-10 |
| 文件页数： | 3/12页 |
| 文件大小： | 209K |
| 代理商： | LTC4416IMS#TR |
LTC4416/LTC4416-1
4416fa
Overvoltage
V
R A R c R E
R c R E
V
k
FAIL
ETH
=
+
=
||
.
2
1 222
221
++
=
24 9 187
13 51
. ||
.
k
V
R A R c
R c
V
k
RESTORE
ETH
=
+
=
+
.
.
2
1 222
221 24 9
244 9
12 07
.
k
V
=
The over and undervoltage lockout circuits are shown here
working in tandem. It is possible to configure the circuit
for either over or undervoltage lockout by using only one
of the voltage paths and eliminating the components from
the other. Refer to Figure 7 for an LTC4416-1 configured
for overvotlage protection. If the input does not go below
ground, transistor Q1 can be eliminated.
The LTC4416-1 should be used in this configuration rather
than the LTC4416 because the LTC4416-1 will turn-off
rapidly if an over or undervoltage condition is detected.
RefertoFigure8foracomparisonofthetransientresponse
of the two ICs using the circuit configuration of Figure 6.
The LTC4416 will not turn-off quickly in an overvoltage
or undervoltage condition because the “fast-off” feature
is not enabled. This will cause the output to travel beyond
the desired range.
APPLICATIO S I FOR ATIO
W
U
Figure 9 contains a rapidly changing input voltage on a
much smaller time scale in comparison to Figure 8. The
LTC4416 will require the tE(OFF) time prior to the rapid pull-
up current being applied. The gate voltage will be pulled
high with IG(OFF) which has a minimum current of 500A.
The discharge time of the gate will be dependent on the
capacitance of the external FET and the initial gate-source
voltage of the circuit. The total time delay will equal:
t
c
V
I
DELAY
E OFF
DIScHARGE
E OFF
GS
G
=
+
=
+
(
)
(
)
(
O
OFF)
Figure 8. Transient Response of the LTC4416 vs the LTC4416-1
Light Load with a Large Capacitor on VOUT
Figure 9. Close Up of the Transient Response of the LTC4416-1
to a Rapidly Rising Input
Information furnished by Linear Technology corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
Figure 7. LTC4416-1 Configured for Overvoltage Protection
LTC4416-1
H1
E1
GND
E2
H2
G1
V1
VS
V2
G2
R2C
24.9k
GND
VIN
R2E
187k
VTH2 WITH
HYSTERESIS
VOUT
TO
LOAD
4416 F07
R1A
100k
Q1
Q2
R2A
221k
5
0
20
VIN
VOUT
LTC4416-1
VOUT
LTC4416
40
TIME (ms)
4416 F08
60
80
10
VOL
TAGE
(V)
15
20
VOUT
LTC4416-1
VOUT
LTC4416
13.40
13.45
LTC4416-1
GATE DISCHARGE TIME
= C
13.50
13.55
13.60
VIN
LTC4416
0
10
20
TIME (
s)
4416 F09
30
5
15
tE(OFF)
25
35
40
VOL
TAGE
(V)
V
IG(OFF)
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