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參數(shù)資料
| 型號(hào)： | LTC4230CGN#TRPBF |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 22/36頁(yè) |
| 文件大小： | 384K |
| 描述： | IC CONTRLLR HOT SWAP TRPL 20SSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 熱交換控制器 |
| 應(yīng)用： | 通用 |
| 內(nèi)部開關(guān)： | 無(wú) |
| 電源電壓： | 1.7 V ~ 16.5 V |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-SSOP |
| 包裝： | 帶卷 (TR) |
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22
LTC4230
4230f
start-up sequence where the LTC4230 is powered up into
a load overcurrent condition. Note that the circuit breaker
trips at Time Point 8 and is reset at Time Point 10.
ADJUSTING SLOW COMPnS RESPONSE TIME
The response time of SLOW COMPn is adjusted using a
capacitor connected from the LTC4230s FILTER pin to
ground. If this pin is left unused, SLOW COMPns delay
defaults to 10祍. During normal operation, the FILTER
output pin is held low as an internal 10礎(chǔ) pull-down
current source is connected to this pin by transistor M4.
This pull-down current source is turned off when an
overcurrent load condition is detected by SLOW COMPn.
During an overcurrent condition, the internal 2礎(chǔ) pull-up
current source is connected to the FILTER pin by transis-
tor M5, thereby charging C
FILTER
. As the charge on the
capacitor accumulates, the voltage across C
FILTER
increases. Once the FILTER pin voltage increases to 1.26V,
the electronic circuit breaker trips and the LTC4230s
GATEn pins are switched quickly to ground by transistor
MFn (refer to the Block Diagram). After the circuit breaker
is tripped, M5 is turned off, M4 is turned on and the 10礎(chǔ)
pull-down current then holds the FILTER pin voltage low.
SLOW COMPns response time from an overcurrent fault
condition to when the circuit breaker trips (GATEn OFF) is
given by Equation 7:
t
V
C
A
s
SLOWCOMP
FILTER
n
=
?/DIV>
+ ?/DIV>
1 26
2
10
.
"
(7)
For example, if C
FILTER
= 1000pF, SLOW COMPns response
time = 640祍. As a design aid, SLOW COMPns delay time
(t
SLOW COMP
) versus C
FILTER
for standard values of C
FILTER
from 100pF to 1000pF is illustrated in Table 2.
Table 2. t
SLOWCOMPn
vs C
FILTER
C
FILTER
t
SLOWCOMPn
100pF
73祍
220pF
149祍
330pF
218祍
470pF
306祍
680pF
438祍
820pF
527祍
1000pF
640祍
SENSE RESISTOR CONSIDERATIONS
The fault current level at which the LTC4230s internal
electronic circuit breakers trip is determined by a sense
resistor connected between the LTC4230s V
CCn
and
SENSEn pins and two separate trip points. The first trip
point is set by the SLOW COMPns threshold, V
CB(SLOW)
=
50mV, and the trip occurs if a load current fault condition
exist for more than 10祍. The current level at which the
electronic circuit breaker trips is given by Equation 8:
I
V
R
mV
R
TRIP SLOW
CB SLOW
SENSE
SENSE
(
)
(
)
n
n
n
n
=
=
50
(8)
The second trip point is set by the FAST COMPns thresh-
old, V
CB(FAST)
= 150mV, and occurs during fast load
current transients that exist for 500ns or longer. The
current level at which the circuit breaker trips in this case
is given by Equation 9:
I
V
R
mV
R
TRIP FAST
CB FAST
SENSE
SENSE
(
)
(
)
n
n
n
n
=
=
150
(9)
As a design aid, the currents at which electronic circuit
breaker trips for common values for R
SENSE
are shown in
Table 3.
Table 3. I
TRIP(SLOW)
and I
TRIP(FAST)
vs R
SENSE
R
SENSE
I
TRIP(SLOW)
I
TRIP(FAST)
0.005&
10A
30A
0.006&
8.3A
25A
0.007&
7.1A
21A
0.008&
6.3A
19A
0.009&
5.6A
17A
0.01&
5A
15A
For proper circuit breaker operation, Kelvin-sense PCB
connections between the sense resistor and the LTC4230s
V
CCn
and SENSEn pins are strongly recommended. The
drawing in Figure 11 illustrates the correct way of making
connections between the LTC4230 and the sense resistor.
PCB layout should be balanced and symmetrical to mini-
mize wiring errors. In addition, the PCB layout for the
sense resistor should include good thermal management
techniques for optimal sense resistor power dissipation.
APPLICATIO S I FOR ATIO
U
U
U
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