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参数资料
| 型号： | LTC4230IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/36页 |
| 文件大小： | 384K |
| 描述： | IC CONTRLLR HOT SWAP TRPL 20SSOP |
| 标准包装： | 55 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电源电压： | 1.7 V ~ 16.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 管件 |
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12
LTC4230
4230f
HOT CIRCUIT INSERTION
When circuit boards are inserted into or removed from live
backplanes, the supply bypass capacitors can draw huge
transient currents from the backplane power bus as they
charge. The transient currents can cause permanent dam-
age to the connector pins as well as cause glitches on the
system supply, causing other boards in the system to
reset.
The LTC4230 is designed to turn a printed circuit boards
supply voltages on and off in a controlled manner, allow-
ing the circuit board to be safely inserted or removed from
a live backplane. The device provides a system reset signal
to indicate when board supply voltage drops below a pre-
determined level, as well as a dual function fault monitor.
OUTPUT VOLTAGE MONITOR
The LTC4230 uses a 1.234V bandgap reference, precision
voltage comparators and external resistor dividers to
monitor the output supply voltages as shown in Figure 1.
The operation of the supply monitor in normal mode is il-
lustrated in Figure 2. RESET 1 pulls low during an
undervoltage lockout condition. It remains low until the end
of the soft-start cycle (second timing cycle). FB1 then
assumes control of RESET 1 status. RESET 2 and RESET 3
also pull low during undervoltage lockout. However, FB2
controls RESET 2 and FB3 controls RESET 3 status imme-
diately after clearing UVLO (Figure 2, Time Points 5 and 6).
If the voltage at FBn drops below its reset threshold
(1.234V), the FBCOMP comparator output pulls high.
After passing through a glitch filter, RESETn changes
state. If the voltage at FBn increases above its reset
threshold, the FBCOMP comparator output changes state
and RESETn pulls high.
+
SENSEn
R
SENSE
R2
R1
R3
10k
V
CCn
V
OUT
GATEn
LTC4230
15
FBn
MRn
GND
ON
4230 F01
RESETn
C
TIMER
12
TIMER
14
C
LOAD
Q1
LOGIC
TIMER
1.234V
REFERENCE
FBCOMPn
礟
RESET
4
3
2
1
SHORT
LONG
V
CC
ON/RESET
GND
LONG
PCB EDGE
CONNECTOR
(MALE)
BACKPLANE
CONNECTOR
(FEMALE)
+
Figure 1. Supply Voltage Monitor Block Diagram
APPLICATIO S I FOR ATIO
U
U
U
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| LTC4232IDHC#TRPBF | 功能描述:IC CTLR HOT SWAP 5A 16-DFN 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) |
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