Electronic Components Datasheet Search
  English  ▼

X  

Preview PDF HTML

LT4256-3IGN Datasheet(PDF) 17 Page - Linear Technology

Part # LT4256-3IGN
Description  Positive High Voltage Hot Swap Controller with Open-Circuit Detect
PDF  20 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT4256-3IGN Datasheet(HTML) 17 Page - Linear Technology

Back Button LT4256-3IGN Datasheet HTML 12Page - Linear Technology LT4256-3IGN Datasheet HTML 13Page - Linear Technology LT4256-3IGN Datasheet HTML 14Page - Linear Technology LT4256-3IGN Datasheet HTML 15Page - Linear Technology LT4256-3IGN Datasheet HTML 16Page - Linear Technology LT4256-3IGN Datasheet HTML 17Page - Linear Technology LT4256-3IGN Datasheet HTML 18Page - Linear Technology LT4256-3IGN Datasheet HTML 19Page - Linear Technology LT4256-3IGN Datasheet HTML 20Page - Linear Technology  
Zoom Inzoom in Zoom Outzoom out
 17 / 20 page
background image
LT4256-3
17
42563f
APPLICATIO S I FOR ATIO
Figure 16. High dV/dt MOSFET Turn-On Protection Circuit
4256 F16
R5
0.033
Ω
LT4256-3
SENSE
13
10
12
5
7
8
16
15
1
2
4
9
VCC
GATE
VOUT
FB
PWRGD
RETRY
UV
OV
TIMER
GND
VCC
48V
(SHORT PIN)
Q1
IRF530
D1
CMPZ5241BS
11V
D3
1N4148W
R3
4.02k
R2
4.02k
R1
64.9k
R7
100
Ω
R9
4.02k
R6
10
Ω
R8
36.5k
VOUT
48V
1.2A
R4
27k
CL
C2
33nF
C3
0.1
µF
C1
10nF
OPEN
UV = 36V
OV = 73V
PWRGD = 40V
GND
D2
SMAT70A
+
Figure 17. Enhanced Output Pull-Down Circuit
In order to use this feature as designed, a bidirectional
Zener diode is needed for D1. When the LT4256-3 com-
mands the MOSFET off (and a bidirectional Zener is used),
the output discharges very slowly (tOFF = (CLOAD • VOUT)/
130
µA). Several variations can be implemented to dis-
charge the output faster. The recommeded method is
shown in Figure 17 and uses an external PNP transistor,
diode and resistor to discharge the output quickly.
4256 F17
R5
0.010
Ω
LT4256-3
SENSE
13
RPROG
Q2
2N4920
D3
1N4148
RB 18k
10
5
7
8
16
15
1
2
4
9
VCC
GATE
FB
12
VOUT
PWRGD
RETRY
UV
OV
TIMER
GND
VCC
48V
(SHORT PIN)
Q1
IRF540
D1
CMPZ5241BS
11V
R3
4.02k
R2
4.02k
R1
64.9k
R7
100
Ω
R9
4.02k
R6
1k
R8
36.5k
VOUT
48V
4A
R4
51k
CL
C2
33nF
C3
0.01
µF
C1
10nF
OPEN
UV = 36V
OV = 73V
PWRGD = 40V
GND
D2
SMAT70A
+
The equation to set the nominal discharge current is:
I
R
A
DISCHG
PROG
=µ
()
5000
130
(11)
where RPROG must be less than 1k.
The maximum current equation is:
I
R
A
MAX
PROG
=µ
()
7000
350
(12)



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20


Datasheet Download

Go To PDF Page


Link URL



Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link to Datasheet    |   Link Exchange   |   Manufacturer List
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com