參數(shù)資料
型號(hào): LTC4230CGN#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 28/36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)
28
LTC4230
 4230f
APPLICATIO  S I FOR  ATIO
U
U
U
AUTORETRY AFTER A FAULT
To configure the LTC4230 to automatically retry after a
fault condition, the FAULT (which has an internal 2礎(chǔ) pull-
up current source) and ON pins can be connected to-
gether, as shown in Figure 18. In this case, the autoretry
circuitry will attempt to restart the LTC4230 with an 7%
duty cycle, as shown in the timing diagram of Figure 19. To
prevent overheating the external MOSFET and other com-
ponents during the autoretry sequence, adding a capacitor
(C
AUTO
) to the circuit introduces a delay at the ON pin that
adjusts the autoretry duty cycle. Equation 14 gives the
autoretry duty cycle, modified by the external time con-
stant C
AUTO
:
AutoretryDuty Cycle =
+
t
t
t
TIMER
OFF
TIMER
14 5
100
.  "
"
%
(14)
where t
TIMER
 = LTC4230 system time constant (see TIMER
function) and
t
C
V
A
OFF
AUTO
=
?/DIV>
"  .
1 314
2
For the values shown, the external delay equals 65.7ms
and the autoretry duty cycle drops from 7% to 4%.
To increase the RC delay, the user may either increase
C
AUTO
 or R
AUTO
.
OVERVOLTAGE TRANSIENT PROTECTION
Good engineering practice calls for bypassing the supply
rail of any analog circuit. Bypass capacitors are often
placed at the supply connection of every active device, in
addition to one or more large value bulk bypass capacitors
per supply rail. If power is connected abruptly, the large
bypass capacitors slow the rate of rise of the supply
voltage and heavily damp any parasitic resonance of lead
or PC track inductance working against the supply bypass
capacitors.
CHECK FOR
TIMER < 0.3V
1
3
7
6
5
8
4
FIRST TIMING CYCLE
4230 F19
SECOND TIMING CYCLE
DISCHARGING MODE
NORMAL MODE
CHECK FOR FILTER LOW (< V
REF
)
CHECK FOR FAULT HIGH (> V
REF
 + 50mV)
2
CHECK FOR GATEn < 0.25V
FAST COMPARATOR
ARMED
SLOW COMPARATOR
ARMED
ONCE V
FILTER
 > 1.26V, CIRCUIT BREAKER TRIPS,
ALL GATEn PINS PULL LOW IMMEDIATELY
20礎(chǔ) PULL-UP
1.6礎(chǔ) PULL-DOWN
2礎(chǔ) PULL-UP
V
FILTER
 > 1.26V
V
REF
10礎(chǔ) PULL-DOWN
LOAD CURRENT < 150mV/R
SENSEn
20礎(chǔ) PULL-UP
9
ON/
TIMER
GATEn
V
OUTn
I
LOADn
FILTER
FAULT
GATEn
V
OUTn
V
SENSEn
 = 50mV
REGULATED
LOAD
CURRENT
Figure 19. Autoretry Timing
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