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| 型号： | LTC4232CDHC#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 242K |
| 描述： | IC CTLR HOT SWAP 5A 16-DFN |
| 标准包装： | 73 |
| 类型： | 热交换开关 |
| 应用： | 服务器，储存，通信，嵌入式，消费品 |
| 内部开关： | 是 |
| 电流限制： | 可调 |
| 电源电压： | 2.9 V ~ 15 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 供应商设备封装： | 16-DFN（5x3） |
| 包装： | 管件 |
LTC4232
8
4232fa
operaTion
The Functional Diagram displays the main circuits of the
device. The LTC4232 is designed to turn a boards supply
voltage on and off in a controlled manner allowing the board
to be safely inserted and removed from a live backplane.
The LTC4232 includes a 25m?MOSFET and a 7.5m?cur-
rent sense resistor. During normal operation, the charge
pump and gate driver turn on the pass MOSFETs gate to
provide power to the load. The inrush current control is
accomplished by the INRUSH circuit. This circuit limits
the GATE ramp rate to 0.3V/ms and hence controls the
voltage ramp rate of the output capacitor.
The current sense (CS) amplifier monitors the load current
using the voltage sensed across the current sense resistor.
The CS amplifier limits the current in the load by reduc-
ing the GATE-to-OUT voltage in an active control loop. It
is simple to adjust the current limit threshold using the
current setting (I
SET
) pin. This allows a different threshold
during other times such as start-up.
A short circuit on the output to ground causes significant
power dissipation during active current limiting. To limit
this power, the foldback amplifier reduces the current
limit value from 5.6A to 1.5A in a linear manner as the
FB pin drops below 0.6V (see the Typical Performance
Characteristics section).
If an overcurrent condition persists, the TIMER pin ramps
up with a 100礎 current source until the pin voltage
exceeds 1.235V (comparator TM2). This indicates to the
logic that it is time to turn off the pass MOSFET to prevent
overheating. At this point the TIMER pin ramps down us-
ing the 2礎 current source until the voltage drops below
0.21V (Comparator TM1) which tells the logic to start an
internal 100ms timer. At this point, the pass transistor
has cooled and it is safe to turn it on again. It is suitable
for many applications to use an internal 2ms overcurrent
timer with a 100ms cooldown period. Tying the TIMER
pin to INTV
CC
sets this default timing.
The output voltage is monitored using the FB pin and the
PG comparator to determine if the power is available for
the load. The power good condition is signaled by the PG
pin using an open-drain pull-down transistor.
The Functional Diagram also shows the monitoring blocks
of the LTC4232. The two comparators on the left side
include the UV and OV comparators. These comparators
determine if the external conditions are valid prior to turning
on the MOSFET. But first the undervoltage lockout circuits
UVLO1 and UVLO2 must validate the input supply and
the internally generated 3.1V supply (INTV
CC
) and gener-
ate the power up initialization to the logic circuits. If the
external conditions remain valid for 100ms the MOSFET
is allowed to turn on.
Other features include MOSFET current and temperature
monitoring. The current monitor (CM) outputs a current
proportional to the sense resistor current. This current can
drive an external resistor or other circuits for monitoring
purposes. A voltage proportional to the MOSFET tempera-
ture is output to the I
SET
pin. The MOSFET temperature
allows external circuits to predict failure and shutdown
the system.
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