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参数资料
| 型号： | LTC4241IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 279K |
| 描述： | IC CTRLR HOTSWAP 3.3V AUX 20SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | PCI，PCI-X |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，±12V |
| 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： | 带卷 (TR) |
LTC4241
12
sn4241 4241f
For C
TIMER
= 0.1礔, the timer period will be ~50ms. The
TIMER pin is immediately pulled low when ON goes low.
Thermal Shutdown
The internal switches for the 12V and 12V supplies are
protected by an internal current limit and thermal shut-
down circuit. When the temperature of the chip reaches
150癈, only the switches controlling the PCI supplies will
be latched off and the FAULT pin will be pulled low.
Short-Circuit Protection for PCI Power Supplies
During a normal power-up sequence for the PCI power
supplies, if the TIMER is done ramping and any supply is
still in current limit, all of the pass transistors will be
immediately turned off, the TIMER and FAULT pin will be
pulled low as shown in Figure 4.
spikes for example, from a fan turning on from
causing false trips of the circuit breaker. The chip will stay
in the latched-off state until the ON pin is cycled low then
high, or the 12V
IN
supply is cycled.
To prevent excessive power dissipation in the pass tran-
sistors and to prevent voltage spikes on the supplies
during short-circuit conditions, the current limit on each
PCI supply, except the 3.3V auxiliary 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 prevent voltage glitches when powering up into a
short.
APPLICATIO S I FOR ATIO
U
U
U
If a short-circuit occurs after the PCI supplies are powered
up, the shorted supplys current will drop immediately to
the limit value (Figure 5).
If the supply remains in current limit for more than 17祍,
all of the PCI supplies except the 3.3V auxiliary supply will
be latched off. The 17祍 delay prevents quick current
Figure 4. Power-Up into a Short on 3.3V Output
Figure 5. Short-Circuit on 5V Followed by Circuit Breaker Reset
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 5V
OUT
and R2 for 3V
OUT
, see Figure 1). As
shown in Figure 1, a sense resistor is connected between
5V
IN
and 5V
SENSE
for the 5V supply. For the 3V supply, a
sense resistor is connected between 3V
IN
and 3V
SENSE
.
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
PWRGD
10V/DIV
5V
OUT
5V/DIV
3V
OUT
5V/DIV
12V
OUT
5V/DIV
V
EEOUT
5V/DIV
FAULT
10V/DIV
20ms/DIV
4241 F04
ON
10V/DIV
TIMER
10V/DIV
GATE
10V/DIV
PWRGD
10V/DIV
5V
OUT
5V/DIV
3V
OUT
5V/DIV
12V
OUT
5V/DIV
V
EEOUT
5V/DIV
FAULT
10V/DIV
20ms/DIV
4241 F05
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| LTC4242 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Slot Hot Swap Controller for PCI Express |
| LTC4242CG | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Slot Hot Swap Controller for PCI Express |
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