參數(shù)資料
型號: LTC4230CGN#TRPBF
廠商: Linear Technology
文件頁數(shù): 12/36頁
文件大?。?/td> 384K
描述: IC CONTRLLR HOT SWAP TRPL 20SSOP
標(biāo)準包裝: 2,500
類型: 熱交換控制器
應(yīng)用: 通用
內(nèi)部開關(guān):
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)
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
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
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