參數(shù)資料
型號(hào)： LTC1646IGN#TR
廠商： Linear Technology
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 407K
描述： IC CNTRLR HOTSWAP PCIDUAL 16SSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： CompactPCI?
內(nèi)部開關(guān)： 無(wú)
電源電壓： 3.3V，5V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SSOP
包裝： 帶卷 (TR)
其它名稱： LTC1646IGNTR
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
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