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参数资料
| 型号： | LTC4210-4CS6 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | PLASTIC, MO-193, TSOT-23, 6 PIN |
| 文件页数： | 3/16页 |
| 文件大小： | 216K |
| 代理商： | LTC4210-4CS6 |
11
LTC4210-3/LTC4210-4
421034fa
APPLICATIO S I FOR ATIO
WU
UU
GATE ramp up. If the RSENSE current is below the current
limit, the GATE ramps at a constant rate of:
=
V
T
I
C
GATE
(6)
where CGATE is the total capacitance at the GATE pin.
The current through RSENSE can be divided into two
components; ICLOAD due to the total load capacitance
(CLOAD) and ILOAD due to the noncapacitive load elements.
The capacitive load typically dominates.
For a successful start-up without current limit, IRSENSE <
ILIMIT:
IRSENSE = ICLOAD + ILOAD < ILIMIT
IC
V
T
II
RSENSE
LOAD
OUT
LOAD
LIMIT
=
+<
(7)
Due to the voltage follower configuration, the VOUT ramp
rate approximately tracks VGATE:
=
≈
=
V
T
I
C
V
T
I
C
OUT
CLOAD
LOAD
GATE
(8)
At time point 6, VOUT is approximately VIN 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 IRSENSE by decreasing the IGATE current (<10A).
II
mV
R
RSENSE
LIMIT
SENSE
==
50
Equations 7 and 8 are applicable but with a lower GATE and
VOUT ramp rate.
Gate Start-Up Time
The start-up time without current limit is given by:
tC
VV
I
tC
V
STARTUP
GATE
TH
IN
GATE
STARTUP
GATE
=
+
=
T
TH
GATE
IN
GATE
I
C
V
I
+
VTIMER
VGATE
VOUT
IRSENSE
VON
VIN
>2.5V
12
3 4 5
5A
5B 6
7
RESET
MODE
INITIAL
CYCLE
START-UP
CYCLE
NORMAL
CYCLE
5
A
100
A
COMP1
10
A
10
A
60
A
100
A
DISCHARGE
BY LOAD
REGULATED AT 50mV/RSENSE
VTH
COMP2
2
A
<10
A
4210 F04
>1.3V
Figure 4. Operating Sequence with
Current Limiting at Start-Up Cycle
(9)
(10)
During current limiting, the second term in Equation 10 is
partly modified from CGATE VIN/IGATE to CLOAD
VIN/ICLOAD. The start-up time is now given by:
tC
V
I
C
V
I
C
STARTUP
GATE
TH
GATE
LOAD
IN
CLOAD
GA
=+
=
T
TE
TH
GATE
LOAD
IN
RSENSE
LOAD
V
I
C
V
II
–
+
(11)
For successful completion of current limit start-up cycle
there must be a net current to charge CLOAD and the
current limit duration must be less than tCBDELAY. The
second term in Equation 11 has to fulfill Equation 12.
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