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UC2909 Fiches technique(PDF) 8 Page - Texas Instruments |
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UC2909 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 14 page 8 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 |
Numéro de pièce similaire - UC2909_13 |
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Description similaire - UC2909_13 |
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