ADC 2 Specifications Page 14

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LTC4261/LTC4261-2
14
42612fd
For more information www.linear.com/LTC4261
22
1
6
5
28
27
4
3
V
EE
R6
100k
R
IN
8 × 240Ω IN SERIES
1/4W EACH
C
VCC
0.1µF
V
EE
C
IN
1µF
MOC207
217 23
R8
7.5k
R7A
10k
R7B
10k
R9
5.1k
R7
100k
R24
5.1k
R23
1k
R22
1k
R17
100k
1%
Q11
2N5401
OUTPUT
SENSE
Q12
2N5401
R19
2.49k
1%
V
EE
V
EE
V
OUT
V
OUT
V
OUT
R20
2.49k
1%
R18
100k
1%
R4
20k
R21
1k
5V
LUCENT
FLTR100V10
V
IN
+
–48V RTN OUTPUT
V
IN
CASE
V
OUT
+
V
OUT
MICRO-
CONTROLLER
V
DD
GND
SCL
SDA
ALERT
MBRM5100
C
L
4000µF
100V
0V TRANSIENT
RESEVOIR
CAPACITOR
RST
LUCENT
JW050A1-E
V
IN
+
V
IN
V
EE
Q5
MOC207
ON/OFF
CASE
LTC2900
SUPPLY
MONITOR
V
DD
RST
GND
V
OUT
+
V
OUT
R
L
343Ω
7 × 2.4k, 0805
EACH 28.7W
+
Q8
A
B
ANODE
V
CC
Q3
HCPL-0300
GND
CATHODE
R
L
V
OUT
ANODE
V
CC
Q4
Q6 Q7
42612 F02b
5V
PS9113 PS9113
6N139
CATHODE
V
O
V
O
V
CC
GND
ANODE
CATHODE
V
O
V
CC
ANODE
CATHODE
GND
GND
FLTIN
PGI
SCL
SDAI
PGIO
PG
SDAO
ALERT
LTC4261CGN
V
IN
INTV
CC
ADIN
Figure 2b. 200W AdvancedTCA Hot Swap Controller with Input/Output Monitoring
and Power Good Watchdog Using LTC4261 in I
2
C Mode (Part Two)
the voltage at V
IN
to 11.2V (V
Z
) and provides power to the
GATE driver. The data converter and logic control circuits
are powered by an internal linear regulator that derives
5V from the 11.2V supply. The 5V output is available at
the INTV
CC
pin for driving external circuits (up to 20mA
load current).
Bypass capacitors of 1µF and 0.1µF are recommended
at V
IN
and INTV
CC
, respectively. R
IN
should be chosen to
accommodate the maximum supply current requirement
of the LTC4261/LTC4261-2 (5mA) plus the supply current
required by any external devices driven by the V
IN
and
INTV
CC
pins at the minimum intended operation voltage.
R
IN
V
48V(MIN)
V
Z(MAX)
I
IN(MAX)
+ I
EXTERNAL
The maximum power dissipation in the resistor is:
P
MAX
=
V
48V(MAX)
V
Z(MIN)
( )
2
R
IN
If the power dissipation is too high for a single resistor,
use multiple resistors in series or supply external loads
from a separate NPN buffer as illustrated in Figure 3.
Initial Start-Up and Inrush Control
Several conditions must be satisfied before the FET turn-on
sequence is started. First the voltage at V
IN
must exceed
its 9V undervoltage lockout level. Next the internal supply
INTV
CC
must cross its 4.25V undervoltage lockout level.
This generates a 100µs to 160µs power-on-reset pulse
during which the FAULT register bits are cleared and the
CONTROL register bits are set or cleared as described in
the register section. After the power-on-reset pulse, the
voltages at the UVH, UVL and OV pins must satisfy UVH
> 2.56V, UVL > 2.291V and OV < 1.77V to indicate that
the input power is within the acceptable range and the EN
pin must be pulled low. All the above conditions must be
satisfied throughout the duration of the start-up debounce
delay that is set by an external capacitor (C
TMR
) connected
to the TMR pin. C
TMR
is charged with a pull-up current of
APPLICATIONS INFORMATION
RTN
100Ω
BCP56
V
IN
OR
INTV
CC
10.5V OR 4.3V
42612 F03
Figure 3. NPN Buffer Relieves R
IN
of Excessive Dissipation
when Supplying External Loads
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