參數(shù)資料
型號(hào): LTC4210-2
廠(chǎng)商: Linear Technology Corporation
元件分類(lèi): 基準(zhǔn)電壓源/電流源
英文描述: Hot Swap Controller in 6-Lead SOT-23 Package
中文描述: 熱插拔控制器的6引腳SOT - 23封裝
文件頁(yè)數(shù): 12/20頁(yè)
文件大?。?/td> 246K
代理商: LTC4210-2
12
LTC4210-1/LTC4210-2
421012f
The current through R
SENSE
can be divided into two
components; I
CLOAD
due to the total load capacitance
(C
LOAD
) and I
LOAD
due to the noncapacitive load elements.
The capacitive load typically dominates.
For a successful start-up without current limit, I
RSENSE
<
I
LIMIT
:
I
RSENSE
= I
CLOAD
+ I
LOAD
< I
LIMIT
I
C
V
T
I
I
RSENSE
LOAD
OUT
LOAD
LIMIT
=
+
<
(7)
Due to the voltage follower configuration, the V
OUT
ramp
rate approximately tracks V
GATE
:
=
=
V
T
I
C
V
T
I
C
OUT
CLOAD
LOAD
GATE
GATE
GATE
(8)
At time point 6, V
OUT
is approximately V
IN
but GATE ramp-
up continues until it reaches a maximum voltage. This
maximum voltage is determined either by the charge
pump or the internal clamp.
Start-Up Cycle With Current Limit
If the duration of the current limit is brief during start-up
(Figure 4) and it did not last beyond the circuit breaker
function time out, the GATE behaves the same as in start-
up without current limit except for the time interval be-
tween time point 5A and time point 5B. The servo amplifier
limits I
RSENSE
by decreasing the I
GATE
current (<10
μ
A).
mV
R
SENSE
Equations 8 and 9 are applicable but with a lower GATE and
V
OUT
ramp rate.
I
I
RSENSE
LIMIT
=
=
50
(9)
Gate Start-Up Time
The start-up time without current limit is given by:
t
C
V
V
I
t
C
V
I
C
V
I
STARTUP
GATE
TH
IN
GATE
STARTUP
GATE
TH
GATE
GATE
IN
GATE
=
+
=
+
(10)
During current limiting, the second term in Equation 10 is
partly modified from C
GATE
V
IN
/I
GATE
to C
LOAD
V
IN
/I
CLOAD
. The start-up time is now given by:
t
C
V
I
C
V
I
C
V
I
C
V
I
I
STARTUP
GATE
TH
GATE
LOAD
IN
CLOAD
GATE
TH
GATE
LOAD
IN
RSENSE
LOAD
=
+
=
+
For successful completion of current limit start-up cycle
there must be a net current to charge C
LOAD
and the
current limit duration must be less than t
CBDELAY
. The
second term in equation 11 has to fulfill equation 12.
C
V
I
I
t
LOAD
IN
RSENSE
LOAD
CBDELAY
<
(12)
APPLICATIOU
W
U
U
V
TIMER
V
GATE
V
OUT
I
RSENSE
V
ON
V
IN
>2.5V
1
2
3 4 5
5A
5B 6
7
RESET
MODE
INITIAL
CYCLE
START-UP
CYCLE
NORMAL
CYCLE
5
μ
A
100
μ
A
COMP1
10
μ
A
10
μ
A
60
μ
A
100
μ
A
DISCHARGE
BY LOAD
REGULATED AT 50mV/R
SENSE
V
TH
COMP2
2
μ
A
<10
μ
A
4210 F04
>1.3V
Figure 4. Operating Sequence with
Current Limiting at Start-Up Cycle
(11)
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