
LTC4261/LTC4261-2
13
42612fd
For more information www.linear.com/LTC4261
The LTC4261/LTC4261-2 are ideally suited for –48V
distributed power systems and AdvancedTCA systems.
A basic 200W application circuit using the LTC4261 is
shown in Figure 1. A more complete application circuit
with AdvancedTCA connections is shown in Figure 2.
Input Power Supply
Power for the LTC4261/LTC4261-2 is derived from the
–48V RTN through an external current limiting resistor
(R
IN
) to the V
IN
pin. An internal shunt regulator clamps
+
FLTIN
PGI
SCL
SDAI
SDAO
ALERT
PG
ADIN
8
9
10
11
19
20
26
2
25
24
22
1
6
5
4
3
27 PWRGD1
23
UVL
UVH
ADIN2
OV
SS
TMR
EN
ON
ADR1
ADRO
RAMPDRAINGATE
LTC4261CGN
V
IN
INTV
CC
V
EE
SENSE
R
D
1M
R
IN
4 × 1k IN SERIES
1/4W EACH
R3
453k
1%
UV = 38.5V
UV RELEASE
AT 43V
OV RELEASE
AT 71V
OV = 72.3V
R2
16.9k
1%
R1
11.8k
1%
C
R
10nF
100V
5%
C
F
33nF
C
TMR
47nF
C
SS
220nF
C
VCC
0.1µF
C
IN
1µF
C
UV
100nF
C
G
47nF
R
S
0.008Ω
1%
R
G
10Ω
Q1
IRF1310NS
R11
402k 1%
R10
10k 1%
R
F
1k
13 14 15 16 18
C
L
100V
217
MODULE2
ON
V
IN
+
V
IN
–
MODULE1
ON
V
IN
+
V
IN
–
V
OUT
PGIO
28 PWRGD2
Figure 1. –48V/200W Hot Swap Controller Using LTC4261 with Current,
Input Voltage and V
DS
Monitoring (5.6A Current Limit, 0.66A Inrush)
Figure 2a. 200W AdvancedTCA Hot Swap Controller with Input/Output Monitoring
and Power Good Watchdog Using LTC4261 in I
2
C Mode (Part One)
8
9
10
11
19
20
26
2
25
24
R
D
1M
R
H
604Ω
1%
R3
412k
1%
UV TURN OFF = 34.2V
UV RELEASE = 37.5V
OV TURN OFF = 74.8V
OV RELEASE = 73.2V
R2
19.1k
1%
R14
100k
R11
100k
R10
100k
RTN A
RTN B
–48V A
–48V B
R13
10k
R12
10k
MBRM5100
10A
10A
R15
100k
Q10
2N5401
R1
10.5k
1%
R16
100k
C
R
10nF
100V
5%
C
F
33nF
C
TMR
330nF
C
SS
330nF
C
UV
100nF
1N4148
×2
C
G
47nF
R
S
0.008Ω
5%
R
G
10Ω
Q1
IRF1310NS
R
F
1k
13 14 15 16 18
42612 F02a
C
EN
1µF
HZS5C1
Q9
2N5401
7A
LTC4354
PLUG-IN
7A
BACKPLANE
A
B
UVL
UVH
ADIN2
OV
SS
TMR
EN
ON
ADR1
ADR0
RAMPDRAINGATE
LTC4261CGN
V
EE
V
EE
SENSE
APPLICATIONS INFORMATION
Kommentare zu diesen Handbüchern