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參數(shù)資料
| 型號(hào)： | LTC4252 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Negative 48V Hot Swap Controller |
| 中文描述： | 負(fù)48V熱插拔控制器 |
| 文件頁(yè)數(shù)： | 8/32頁(yè) |
| 文件大?。?/td> | 327K |
| 代理商： | LTC4252 |
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LTC4252-1/LTC4252-2
8
425212f
TYPICAL PERFOR AU
t
SS
vs Temperature
V
IN
(Pin 1/Pin 1):
Positive Supply Input. Connect this pin
to the positive side of the supply through a dropping
resistor. A shunt regulator clamps V
IN
at 13V. An internal
undervoltage lockout (UVLO) circuit holds GATE low until
the V
IN
pin is greater than V
LKO
(9.2V), overriding UV and
OV. If UV is high, OV is low and V
IN
comes out of UVLO,
TIMER starts an initial timing cycle before initiating a GATE
ramp-up. If V
IN
drops below approximately 8.2V, GATE
pulls low immediately.
PWRGD (Pin 2/Not Available):
Power Good Status Out-
put (MS only). At start-up, PWRGD latches low if DRAIN
is below 2.385V and GATE is within 2.8V of V
IN
. PWRGD
status is reset by UV, V
IN
(UVLO) or a circuit breaker fault
timeout. This pin is internally pulled high by a 58
μ
A current
source.
SS (Pin 3/Pin 2):
Soft-Start Pin. This pin is used to ramp
inrush current during start up, thereby effecting control
over di/dt. A 20x attenuated version of the SS pin voltage
is presented to the current limit amplifier. This attenuated
voltage limits the MOSFET’s drain current through the
sense resistor during the soft-start current limiting. At the
beginning of a start-up cycle, the SS capacitor (C
SS
) is
ramped by a 22
μ
A current source. The GATE pin is held
low until SS exceeds 20 V
OS
= 0.2V. SS is internally
shunted by a 100k resistor (R
SS
) which limits the SS pin
voltage to 2.2V. This corresponds to an analog current
limit SENSE voltage of 100mV. If the SS capacitor is
omitted, the SS pin ramps from 0V to 2.2V in about 220
μ
s.
The SS pin is pulled low under any of the following
conditions: in UVLO, in an undervoltage condition, in an
overvoltage condition, during the initial timing cycle or
when the circuit breaker fault times out.
SENSE (Pin 4/Pin 3):
Circuit Breaker/Current Limit Sense
Pin. Load current is monitored by a sense resistor R
S
connected between
SENSE and V
EE
, and controlled in
three steps.
If SENSE exceeds V
CB
(50mV), the circuit
breaker comparator activates a (230
μ
A+8I
DRN
) TIMER
pull-up current. If SENSE exceeds V
ACL
(100mV), the
analog current limit amplifier pulls GATE down to regulate
the MOSFET current at V
ACL
/R
S
. In the event of a cata-
strophic short-circuit, SENSE may overshoot 100mV. If
SENSE reaches V
FCL
(200mV), the fast current limit com-
parator pulls GATE low with a strong pull-down. To disable
the circuit breaker and current limit functions, connect
SENSE
to V
EE
.
PIU
I
PGH
vs Temperature
t
PLLUG
and t
PHLOG
vs Temperature
TEMPERATURE
°
(C)
–55 –35 –15
5
25
45
65
85 105 125
I
P
μ
A
4252-1/2 G38
62
61
60
59
58
57
56
55
V
PWRGD
= 0V
(MS ONLY)
TEMPERATURE (
°
C)
–55 –35 –15
5
25
45
65
85 105 125
t
S
μ
s
4252-1/2 G27
220
210
200
190
180
170
160
150
SS PIN FLOATING,
V
SS
RAMPS FROM 0.2V TO 2V
TEMPERATURE (
°
C)
–55
D
μ
s
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–15
25
45
125
4252-1/2 G24
–35
5
65
85 105
t
PLLUG
t
PHLOG
(MS/MS8)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC4252-1CMS | TRANS ARRAY PNP/PNP SS MINI-6P |
| LTC4252-1CMS8 | TRANS ARRAY NPN/NPN SSMINI-6 |
| LTC4252-1IMS | TRANS ARRAY NPN/NPN SSMINI-6 |
| LTC4252-1IMS8 | TRANS ARRAY NPN/NPN SSMINI-6 |
| LTC4252-2CMS8 | Negative Voltage Hot Swap Controllers |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4252-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-1_12 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Hot Swap Controllers |
| LTC4252-1A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Negative Voltage Diode-OR Controller |
| LTC42521CMS | 制造商:Linear Technology 功能描述: |
| LTC4252-1CMS | 功能描述:IC CNTRLR HOTSWAP NEGVOLT 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件 |
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