參數(shù)資料
型號(hào): LT4256-1IS8#TRPBF
廠商: Linear Technology
文件頁(yè)數(shù): 12/16頁(yè)
文件大?。?/td> 213K
描述: IC CTRLR HOTSWAP HV LATCH 8SOIC
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: 10.8 V ~ 80 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
LT4256-1/LT4256-2
12
425612fa
APPLICATIO  S I FOR  ATIO
U
U
U
Figure 12. Active Low Enable PWRGD Application
4256 F11
R5
100m&
LT4256-1/
LT4256-2
SENSE
6
2
3
4
8
7
1
5
V
CC
GATE
FB
PWRGD
UV
TIMER
GND
V
IN
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241B
11V
R2
8.06k
R1
64.9k
R7
100&
R6
10&
V
OUT
V
LOGIC
R4
27k
R8
36.5k
C
L
R10
27k
C2
33nF
C3
0.1礔
C1
10nF
R9
4.02k
Q2
2N3904
PWRGD
GND
D2
SMAT70A
UV = 36V
PWRGD = 40V
Power Good Detection
The LT4256-1/LT4256-2 includes a comparator for moni-
toring the output voltage. The output voltage is sensed
through the FB pin via an external resistor string. The
comparators output (PWRGD) is an open collector ca-
pable of operating from a pull-up as high as 80V.
PWRGD can be used to directly enable/disable a power
module with an active high enable input. Figure 12 shows
how to use PWRGD to control an active low enable input
power module. Signal inversion is accomplished by tran-
sistor Q2 and R10.
4256 F07
R5
0.010&
LT4256-1/
LT4256-2
SENSE
6
3
4
7
8
1
5
V
CC
GATE
FB
2
PWRGD
UV
TIMER
GND
V
IN
48V
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241B
11V
R2
8.06k
Q2
VN2222
R1
64.9k
R7
100&
R9
4.02k
R6
10&
R8
36.5k
V
OUT
48V
4A
R4
51k
C
L
C2
33nF
C3
0.01礔
OFF SIGNAL
FROM MPU
C1
10nF
GND
D2
SMAT70A
UV = 36V
PWRGD = 40V
Figure 11. How to Use a Logic Signal to Control LT4256 Turn-On/-Off
The thresholds for the FB pin are 4.45V (low to high) and
3.99V (high to low). To calculate the PWRGD thresholds,
use the following equations:
V
k
R    R
k
8 =
V
"R9, high to low
(7)
(8a)
= 4.45V 1+
R8
R9
, low to high
(8b)
THPWRGD
THPWRGD
3 99
1
0
8    9   200
.

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