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UC2909NG4 датащи(PDF) 8 Page - Texas Instruments

номер детали UC2909NG4
подробное описание детали  Switchmode Lead-Acid Battery Charger
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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UC2909
UC3909
During the bulk charge state, the voltage error amplifier
is now operational and is commanding maximum charge
current (IBULK) set by Equation 1. The voltage loop at-
tempts to force the battery to VOC.
C) Overcharge State
STAT0 = STATLV = logic 0, STAT1 = logic 1
The battery voltage surpasses 95% of VOC indicating
the UC3909 is in its overcharge state.
During the overcharge charge state, the voltage loop be-
comes stable and the charge current begins to taper off.
As the charge current tapers off, the voltage at CSO in-
creases toward its null point of 2.3V. The center connec-
tion of the two resistors between CSO and VLOGIC sets
the overcurrent taper threshold (OVCTAP). Knowing the
desired overcharge terminate current (IOCT), the resistors
ROVC1 and ROVC2 can be calculated by choosing a value
of ROVC2 and using the following equation:
(5)
()
RI
RS
R
OVC
OCT
OVC
12
18518
=•
.
D) Float State
STAT0 = STAT1 = STATLV = logic 1
The battery charge current tapers below its OVCTAP
threshold, and forces STATLV high increasing the volt-
age sense divider ratio. The voltage loop now forces the
battery charger to regulate at its float state voltage (VF).
(6)
()
()
VV
RS
RS
RS
RS
FREF
=
++
123
3
If the load drains the battery to less than 90% of VF, the
charger goes back to the bulk charge state, STATE 1.
OFF LINE APPLICATIONS
For off line charge applications, either Figure 3 or Figure
4 can be used as a baseline. Figure 3 has the advan-
tage of high frequency operation resulting in a small iso-
lation transformer. Figure 4 is a simpler design, but at
the expense of larger magnetics.
APPLICATION INFORMATION (cont.)
Figure 3. Off line charger with primary side PWM
UDG-95009


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