ltc4350 Linear Technology Corporation, ltc4350 Datasheet - Page 13

• Manufacturer Part Number: ltc4350
• Description: Hot Swappable Load Share Controller
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
compensation capacitor C
using t
150Ω. This value guarantees the zero is at or above the
crossover frequency.
Table 1
OTHER APPLICATIONS
The application shown on the first page of this data sheet
assumes that the power supplies and the load reside on
one main board. If the system is a true N + 1 hot swappable
100µs
150µs
200µs
300µs
400µs
500µs
10µs
20µs
40µs
60µs
80µs
5µs
R
t
R
. The value for the zero setting resistor, R
U
f
C
17.5kHz
U
8.8kHz
5.8kHz
4.4kHz
3.5kHz
2.3kHz
1.8kHz
1.2kHz
0.9kHz
0.7kHz
= 0.35/t
70kHz
35kHz
P2
can be looked up in Table 1
R
W
0.22µF
0.47µF
U
0.1µF
1.5µF
2.2µF
2.7µF
3.3µF
4.7µF
6.8µF
10µF
12µF
1µF
C
P2
P1
, is
power supply, then the LTC4350 will reside with the power
supply on a daughter card that plugs into the main board.
In this case, the input and output capacitors need to be hot
swapped (see Figure 7). The output capacitors are Hot
Swap protected by the LTC4350. The input capacitors are
Hot Swap protected using the LT
parts are described in Table 2.
Table 2
In some cases, the output voltage is below the undervoltage
lockout of the LTC4350. In this case, an external supply of
3.3V or greater needs to provide for the chip. Figure 8
shows a 1.5V output redundant power supply that uses
24V to 1.5V switching power supplies. The V
LTC4350 can be driven from the INTV
VOLTAGE RANGE
– 20V to – 80V
2.7V to 16.5V
3.3V to 12V
3.3V to 15V
9V to 80V
PART NUMBER
LTC1422 Single Channel
LTC1645 Dual Chanel
LTC1642 Overvoltage Protection
LTC1647 Dual Channel
LT1641 Positive High Voltage
LT4250 Negative High Voltage
®
4250. Other Hot Swap
CC
pin of the LTC1629.
LTC4350
CC
pin of the
13
4350fa