參數(shù)資料
型號(hào)： LTC1645IS#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 15/24頁(yè)
文件大?。?/td> 329K
描述： IC CTRLR SEQ HOTSWAP DUAL 14SOIC
標(biāo)準(zhǔn)包裝： 2,500
類(lèi)型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： 1.2 V ~ 12 V
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 14-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 14-SOIC
包裝： 帶卷 (TR)
15
LTC1645
1645fa
V
IN2
5V/DIV
V
IN1
5V/DIV
V
OUT2
5V/DIV
V
OUT1
5V/DIV
TIMER
2V/DIV
RESET
5V/DIV
Figure 16. Ramping 3.3V and 2.5V Up and Down Together
APPLICATIO S I FOR ATIO
U
U
U
This circuit guarantees that: (1) V
OUT1
  never exceeds
V
OUT2
 by more than 1.2V, and (2) V
OUT2
 is never greater
than V
OUT1
 by more than 0.4V. On power-up, V
OUT1
 and
V
OUT2
 ramp up together. On power-down, the LTC1645
turns off Q1 and Q2 simultaneously. Charge remains
stored on C
LOAD1
 and C
LOAD2
 and the output voltages will
vary depending on the loads. D1 and D2 turn on at H1V
(H0.5V each), ensuring condition 1 is satisfied, while D3
prevents violations of condition 2. Different diodes may be
necessary for different output voltage configurations.
Barring an overvoltage condition at the input(s), the only
time these diodes might conduct current is during a
power-down event, and then only to discharge C
LOAD1
 or
C
LOAD2
. In the case of an input overvoltage condition that
causes excess current to flow, the circuit breaker will trip
if the current limit level is set appropriately.
Figure 17 shows an application circuit where V
OUT1
ramps up before V
OUT2
. V
OUT1
 is initially discharged and
D1 is reverse-biased, thus the voltage at the ON pin is
determined only by V
CC1
 through the resistor divider R1
and R2. The voltage at the ON pin exceeds 0.8V if V
CC1
 is
above 4.6V and V
OUT1
 begins to ramp up after a timing
cycle. As V
OUT1
 ramps up, D1 becomes forward-biased
and pulls the ON pin above 2V when V
OUT1
 H 4.5V. This
turns on GATE2 and V
OUT2
 ramps up. The FB comparator
monitors V
OUT2
, and the spare comparator monitors
V
OUT1
 with R
HYST
 creating H50mV of hysteresis.
Power Supply Multiplexer
Using back-to-back FETs, the LTC1645 can Hot Swap two
supplies to the same output, automatically selecting the
primary supply if present or the secondary supply if the
primary supply is not available. Referring to Figure 18, a
diode-or circuit provides power to the LTC1645 if either
supply is up. Schottky diodes are used to prevent the
voltage at V
CC1
 from approaching the undervoltage lock-
out threshold. This application assumes that if a supply is
not present, the supply input is floating.
If only the 3.3V supply is present, the voltage at the COMP
+
pin is below the trip point and COMPOUT pulls the base of
Q3 low, allowing the GATE1 pin to ramp up normally. The
voltage at the ON pin exceeds 0.8V if the 3.3V supply is
greater than 3V, ramping up GATE1 and turning on Q1A and
Q1B. The ON pin does not exceed 2V (unless the 3.3V supply
exceeds 7.5V!), keeping GATE2 low and Q2A and Q2B off.
If only the 5V supply is present or if both supplies are
present, the COMP
+
 pin is above 1.238V and COMPOUT
allows the base of Q3 to be pulled high by R2. This turns
Q3 on, keeping GATE1 low and Q1A and Q1B off. The
voltage at the ON pin is pulled above 2V by R1 and GATE2
turns Q2A and Q2B on.
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