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参数资料
| 型号： | LTC4253AIGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 电源管理 |
| 英文描述： | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-16 |
| 文件页数： | 9/34页 |
| 文件大小： | 369K |
| 代理商： | LTC4253AIGN#PBF |
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LTC4253/LTC4253A
17
425353afd
applicaTions inForMaTion
TIMER
The operation of the TIMER pin is somewhat complex as
it handles several key functions. A capacitor CT is used
at TIMER to provide timing for the LTC4253/LTC4253A.
Four different charging and discharging modes are avail-
able at TIMER:
1. 5A slow charge; initial timing delay.
2. (200A+8IDRN) fast charge; circuit breaker delay.
3. 5A slow discharge; circuit breaker “cool-off.”
4.Lowimpedanceswitch;resetstheTIMERcapacitorafter
an initial timing delay, in UVLO, in UV and in OV during
initial timing and when RESET is high.
For initial timing delay, the 5A pull-up is used. The
low impedance switch is turned off and the 5A current
source is enabled when the interlock conditions are met.
CT charges to 4V in a time period given by:
t
=
4V CT
5
A
(2)
When CT reaches VTMRH ( 4V), the low impedance switch
turns on and discharges CT. A GATE start-up cycle begins
and both SS and GATE outputs are released.
CIRCUIT BREAKER TIMER OPERATION
If the SENSE pin detects more than 50mV drop across RS,
the TIMER pin charges CT with (200A+8IDRN). If CT
charges to 4V, the GATE pin pulls low and the LTC4253/
LTC4253A latch off. The LTC4253/LTC4253A remain
latched off until the RESET pin is momentarily pulsed
high, the UV pin is momentarily pulsed low, the TIMER
pin is momentarily discharged low by an external switch
or VIN dips below UVLO and is then restored. The circuit
breaker timeout period is given by:
t
=
4V CT
200
A + 8 IDRN
(3)
If VOUT < 5V, an internal PMOS isolates DRAIN pin leakage
current and this makes IDRN = 0 in Equation (3). If VOUT is
above VDRNCL during the circuit breaker fault period, the
charging of CT is accelerated by 8 IDRN of Equation (1).
Intermittent overloads may exceed the 50mV threshold at
SENSEbut,iftheirdurationissufficientlyshort,TIMERwill
not reach 4V and the LTC4253/LTC4253A will not shut the
external MOSFET off. To handle this situation, the TIMER
discharges CT slowly with a 5A pull-down whenever the
SENSE voltage is less than 50mV. Therefore, any intermit-
tent overload with VOUT < 5V and an aggregate duty cycle
of more than 2.5% will eventually trip the circuit breaker
and shut down the LTC4253/LTC4253A. Figure 4 shows
the circuit breaker response time in seconds normalized
to 1F. The asymmetric charging and discharging of CT is
a fair gauge of MOSFET heating.
The normalized circuit response time is estimated by:
t
CT(F)
=
4
205
+ 8 IDRN
(
)D5
for D
> 2.5% (4)
FAULT DUTY CYCLE, D (%)
20
40
60
80
0
NORMALIZED
RESPONSE
TIME
(s/F)
10
1
0.1
0.01
100
4253 F04
t
CT(F)
4
(205 + 8 IDRN) D – 5
=
IDRN = 0A
Figure 4. Circuit Breaker Response Time
相关PDF资料 |
PDF描述 |
|---|---|
| LTC4253AIGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC4253CGN#PBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4253CGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: 0°C to +70°C |
| LTC4253IGN#PBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
| LTC4253IGN#TRPBF | -48V Hot Swap Controller with Sequencer; Package: SSOP; No of Pins: 16; Temperature Range: -40°C to +85°C |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4253BCGN#PBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4253BCGN#PBF | 制造商:Linear Technology 功能描述:HOT SWAP CONTROLLER -48V SSOP-16 |
| LTC4253BCGN#TRPBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC4253BIGN#PBF | 功能描述:IC HOT SWAP CONTROLLER 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 标准包装:50 系列:- 类型:热交换控制器 应用:-48V 远程电力系统，AdvancedTCA ? 系统，高可用性 内部开关:无 电流限制:可调 电源电压:11.5 V ~ 14.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| LTC4253BIGN#PBF | 制造商:Linear Technology 功能描述:HOT SWAP CONTROLLER -48V SSOP-16 |
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