- 您现在的位置：买卖IC网 > PDF目录20109 > LTC1646IGN#PBF (Linear Technology)IC CNTRLR HOTSWAP PCIDUAL 16SSOP PDF资料下载
参数资料
| 型号： | LTC1646IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 407K |
| 描述： | IC CNTRLR HOTSWAP PCIDUAL 16SSOP |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
LTC1646
12
1646fa
APPLICATIO S I FOR ATIO
U
U
U
Figure 4. Power-Up into a Short on 3.3V Output
GATE
5V/DIV
5V
OUT
3V
OUT
2V/DIV
TIMER
1V/DIV
BD_SEL#
5V/DIV
LCL_PCI_RST#
5V/DIV
HEALTHY#
5V/DIV
FAULT
5V/DIV
10ms/DIV
1646 F04
Table 2. t
TIMER
vs C
TIMER
C
TIMER
t
TIMER
C
TIMER
t
TIMER
0.01礔
2.5ms
0.22礔
55ms
0.022礔
5.5ms
0.33礔
82.5ms
0.033礔
8.25ms
0.47礔
118ms
0.047礔
11.8ms
0.68礔
170ms
0.068礔
17ms
0.82礔
205ms
0.082礔
20.5ms
1礔
250ms
0.1礔
25ms
The TIMER pin is immediately pulled low when BD_SEL#
goes high.
Short-Circuit Protection
During a normal power-up sequence, if the TIMER pin is
done ramping and a supply is still in current limit, all of the
pass transistors will be immediately turned off and FAULT
(Pin 3) will be pulled low as shown in Figure 4.
In order to prevent excessive power dissipation in the pass
transistors and to prevent voltage spikes on the supplies
during short-circuit conditions, the current limit on each
supply is designed to be a function of the output voltage.
As the output voltage drops, the current limit decreases.
Unlike a traditional circuit breaker function where huge
currents can flow before the breaker trips, the current
foldback feature assures that the supply current will be
kept at a safe level and prevents voltage glitches at the
input supply when powering up into a short circuit.
After power-up (TIMER pin voltage >1.25V), the 5V and
3.3V supplies are protected from overcurrent and short-
circuit conditions by dual-level circuit breakers. If the
sense resistor voltage of either supply current exceeds
56mV but is less than 150mV, an internal timer is started.
If the supply is still overcurrent after 21祍, the circuit
breaker trips and both supplies are turned off (Figure 5).
V
IN
5V
SENSE
50mV/DIV
GATE
10V/DIV
FAULT
5V/DIV
1 DIV
1 4 F
Figure 5. Overcurrent Fault on 5V
If a short-circuit occurs and the sense resistor voltage of
either supply current exceeds 150mV, the circuit breakers
trip without delay and the chip latches off (Figure 6). The
chip will stay in the latched-off state until OFF/ON (Pin 15)
is cycled high then low, or the 5V
IN
(Pin 12) power supply
is cycled.
The current limit and the foldback current level for the 5V
and 3.3V outputs are both a function of the external sense
resistor (R1 for 3V
OUT
and R2 for 5V
OUT
, see Figure 1). As
shown in Figure 1, a sense resistor is connected between
相关PDF资料 |
PDF描述 |
|---|---|
| VY2151K29Y5SS6TV0 | CAP CER 150PF 300V 10% RADIAL |
| CENB1010A0603F01 | POWER SUPPLY EXT 12W 6V @ 2A |
| T86C475M025EAAS | CAP TANT 4.7UF 25V 20% 2312 |
| VY2151K29Y5SS63V0 | CAP CER 150PF 300V 10% RADIAL |
| VE-21V-EV-F3 | CONVERTER MOD DC/DC 5.8V 150W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1647-1CS8 | 功能描述:IC CONTROLLR HOTSWAP DUAL 8-SOIC RoHS:否 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 |
| LTC1647-1CS8#PBF | 功能描述:IC CTLR HOTSWAP DUAL 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC1647-1CS8#TR | 功能描述:IC CONTROLLER HOTSWAP DUAL 8SOIC RoHS:否 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 |
| LTC1647-1CS8#TRPBF | 功能描述:IC CONTROLLR HOTSWAP DUAL 8-SOIC 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 |
| LTC1647-1IS8 | 功能描述:IC CONTROLLER HOTSWAP DUAL 8SOIC RoHS:否 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 |
发布紧急采购，3分钟左右您将得到回复。