Datasheet

LTC3588-2
14
35882fa
The frequency of the emission will be 120Hz for magnetic
ballasts but could be higher if the light uses electronic
ballast. The LTC3588-2 bridge rectifier can handle a wide
range of input frequencies.
Figure 9 shows the LTC3588-2 powered by a 48V com-
munications line. In this example, 1mA is the maximum
current that is allowed to be drawn. The 28k current limiting
resistor sets this current as the LTC3588-2 will shunt V
IN
at 20V. The advantage of this scheme is that the current at
the output is multiplied by the ratio of V
IN
to V
OUT
(less the
loss in the buck converter). This is useful in cases where
greater current is needed at the output than is available
at the input. The high UVLO of 16V prevents any start-up
issue as there is already a good multiplication factor at
applicaTions inForMaTion
Figure 9. Current Fed 3.45V LiFePO
4
Battery Charger
35882 F09
PZ1
V
IN
CAP
V
IN2
D1
D0
PZ2
PGOOD
SW
V
OUT
LTC3588-2
GND
28k
1mA
LiFePO
4
+
22µH
V
OUT
3.45V
3.5mA
PGOOD
47µF
25V
1µF
6V
48V
4.7µF
6V
10µF
6V
that level. This same technique can be extended to AC
source that also have limited current available at the input.