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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： | 4/16页 |
| 文件大小： | 216K |
| 代理商： | LTC4210-4CS6 |
12
LTC4210-3/LTC4210-4
421034fa
APPLICATIO S I FOR ATIO
WU
UU
C
V
II
t
LOAD
IN
RSENSE
LOAD
CBDELAY
–
<
(12)
Circuit Breaker Timer Operation
When a current limit fault is encountered at time point A in
Figure 5, the circuit breaker timing is activated with a 60
A
pull-up. The circuit breaker trips at time point B if the fault
is still present and the TIMER pin voltage reaches the
COMP2 threshold and the LTC4210 shuts down. For a
continuous fault, the circuit breaker delay is:
tV
C
A
CBDELAY
TIMER
=
13
60
.
(13)
Intermittent overloads may exceed the current limit as in
Figure 6, but if the duration is sufficiently short, the TIMER
pin may not reach the COMP2 threshold and the LTC4210
will not shut down. To handle this situation, the TIMER
discharges with 2
A whenever (VCC – SENSE) voltage is
below the 50mV limit and the TIMER voltage is between
the COMP1 and COMP2 thresholds. When the TIMER
voltage falls below the COMP1 threshold, the TIMER pin is
discharged with an equivalent 7k resistor (normal mode,
100
A source) when (VCC – SENSE) voltage is below the
50mV limit. If the TIMER pin does not drop below the
COMP1 threshold, any intermittent overload with an ag-
gregate duty cycle of more than 3.8% will eventually trip
the circuit breaker. Figure 7 shows the circuit breaker
response time in seconds normalized to 1
F. The asym-
metric charging and discharging of TIMER is a fair gauge
of MOSFET heating.
t
C
sF
VF
AD
A
TIMER
(/
)
.
–
=
()
13
1
60
2
(14)
When the circuit breaker trips, the GATE pin is pulled low.
The TIMER enters latchoff mode with a 5
A pull-up for the
LTC4210-4 (latched-off version), while an autoretry “cool-
off” cycle begins with a 2
A pull-down for the LTC4210-3
(autoretry version). An autoretry cool-off delay of the
LTC4210-3 between COMP2 and COMP1 thresholds takes:
tV
C
A
COOLOFF
TIMER
=
11
2
.
(15)
OVERLOAD DUTY CYCLE, D (%)
10
NORMALIZED
RESPONSE
TIME
(s/
F)
30
1
4210 F07
0.01
0.1
20
100
90
80
70
60
50
40
0
(s/
F) =
t
CTIMER
1.3V 1
F
60
A D – 2A
Figure 7. Circuit Breaker Timer Response
for Intermittent Overload
A1
B1
A2
B2
A3
B3
~50mV/RSENSE
60
A
CIRCUIT BREAKER
TRIPS
COMP1
4210 F06
COMP2
ILOAD
VTIMER
VGATE
2
A
CB
FAULT
CB
FAULT
CB
FAULT
2
A
LATCHED OFF (5
A PULL-UP)
OR RETRY (2
A PULL-DOWN)
60
A
60
A
10
A
10
A
Figure 6. Mulitple Intermittent Overcurrent Conditon
VTIMER
NORMAL
MODE
FAULT
MODE
100
A
COMP1
CIRCUIT BREAKER
TRIPS
LATCHED OFF (5
A PULL-UP)
OR RETRY (2
A PULL-DOWN)
COMP2
AB
60
A
4210 F05
Figure 5. A Continuous Fault Timing
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