參數(shù)資料
型號(hào)： LTC4230CGN#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 8/36頁(yè)
文件大?。?/td> 384K
描述： IC CONTRLLR HOT SWAP TRPL 20SSOP
標(biāo)準(zhǔn)包裝： 2,500
類型： 熱交換控制器
應(yīng)用： 通用
內(nèi)部開(kāi)關(guān)： 無(wú)
電源電壓： 1.7 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)
8
LTC4230
 4230f
FB3 (Pin 1): The FB3 (Feedback) pin is an input to the
FBCOMP3 comparator which monitors the V
CC3
 output
supply voltage through an external resistor divider. If V
FB3
< 1.234V, RESET 3 pin pulls low. An internal glitch filter at
FBCOMP3s output prevents triggering a reset condition
due to negative voltage transients. If V
FB3
  > 1.237V,
RESET 3 pin goes high after exiting undervoltage lockout.
RESET 3 (Pin 2): An open-drain N-channel device whose
source connects to GND (Pin 14). This pin pulls low if the
voltage at FB3 (Pin 1) falls below the FB3 threshold
(1.234V). This pin requires an external pull-up resistor to
V
OUT3
. If an undervoltage lockout condition occurs,
RESET 3 pulls low independently of FB3 to prevent false
glitches.
GATE 3 (Pin 3): The output signal at this pin is the high side
gate drive for Channel 3s external N-channel MOSFET
pass transistor. An internal charge pump produces a 4.5V
(minimum) to 18V (maximum) gate drive voltage for V
CC1
supply voltages from 2.7V to 16.5V, respectively.
As shown in the Block Diagram for each channel, an
internal charge pump supplies a 10礎(chǔ) gate current and
sufficient gate voltage drive to the external MOSFET. The
internal charge pump produces a minimum 4.5V gate
drive for V
CC1
 < 4.75V. For V
CC1
 > 4.75V, the minimum
gate voltage drive is 9V. For V
CC1
 e 12V, the minimum gate
voltage drive is 7V which is set by an internal zener diode
clamp connected between the GATE 3 pin and GND.
SENSE 3 (Pin 4): Circuit Breaker Sense Pin for Channel 3.
With a sense resistor placed in the power path between
V
CC3
 and SENSE 3, Channel 3s electronic circuit breaker
trips if the voltage across the sense resistor (V
CC3
  
V
SENSE3
) exceeds the thresholds set internally for SLOW
COMP3 and FAST COMP3, as shown in the Block Diagram.
The threshold for SLOW COMP3 is V
CB(SLOW)
 = 50mV, and
the electronic circuit breaker trips if the voltage across
R
SENSE3
 exceeds 50mV for 10祍, or for the time delay
programmed by C
FILTER
. To adjust SLOW COMP3s delay,
please refer to the section on Adjusting SLOW COMPns
Response Time.
Under transient conditions where large step current
changes can and do occur over shorter periods of time, a
PI   FU CTIO S
U
U
second (fast) comparator instead trips the electronic
circuit breaker. The threshold for FAST COMP3 is set at
V
CB(FAST)
 = 150mV, and the circuit breaker trips if the
voltage across the R
SENSE3
 exceeds 150mV for more than
500ns. FAST COMP3s delay is fixed in the LTC4230 and
cannot be adjusted. To disable Channel 3s electronic
circuit breaker, connect the V
CC3
  and SENSE 3 pins
together.
V
CC3
 (Pin 5): Positive Supply Input for Channel 3. V
CC3
operates from 1.7V to 15.5V (V
CC3
 d V
CC1
  1V) and its
supply current, I
CC3
, is typically 65礎(chǔ). The master UVLO
circuit disables all three GATEn outputs of the LTC4230
until the voltage at V
CC3
 exceeds 1.19V.
V
CC1
  (Pin 6):  This  is  the  positive  supply  input  to  the
LTC4230, the power supply input for Channel 1, and the
power supply input for all three internal charge pumps.
The LTC4230 operates from 2.7V to 16.5V, and the I
CC1
supply current is typically 1.8mA. The master UVLO circuit
disables all three GATEn outputs of the LTC4230 if V
CC1
 is
less than 2.35V. The internal charge pump outputs are
enabled when V
CC1
  > 2.35V, V
CC2
  > 2.15V, and
V
CC3
 > 1.19V.
SENSE 1 (Pin 7): Circuit Breaker Sense Pin for Channel 1.
With a sense resistor placed in the power path between
V
CC1
 and SENSE 1, Channel 1s electronic circuit breaker
trips if the voltage across the sense resistor (V
CC1
  
V
SENSE1
) exceeds the thresholds set internally for SLOW
COMP1 and FAST COMP1, as shown in the Block Diagram.
The threshold for SLOW COMP1 is V
CB(SLOW)
 = 50mV, and
the electronic circuit breaker trips if the voltage across
R
SENSE1
 exceeds 50mV for 10祍, or for the time delay
programmed by C
FILTER
. To adjust SLOW COMP1s delay,
please refer to the section on Adjusting SLOW COMPns
Response Time.
Under transient conditions where large step current changes
can and do occur over shorter periods of time, a second
(fast) comparator instead trips the electronic circuit breaker.
The threshold for FAST COMP1 is set at V
CB(FAST)
 = 150mV,
and the circuit breaker trips if the voltage across the
R
SENSE1
  exceeds 150mV for more than 500ns. FAST
COMP1s delay is fixed in the LTC4230 and cannot be
adjusted. To disable Channel 1s electronic circuit breaker,
connect the V
CC1
 and SENSE 1 pins together.
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