UC3906 PDF

UC UC Sealed Lead-Acid Battery Charger. FEATURES. •. Optimum Control for Maximum. Battery Capacity and Life. •. Internal State Logic Provides. Operating Temperature, 0°C ~ 70°C (TA). Package / Case, DIP (“, mm). Supplier Device Package, PDIP. Base Part Number, UC Texas Instruments UC PMIC – Battery Chargers parts available at DigiKey.

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Send me some scope plots to look at. During the following procedure, be sure to adjust the voltage with the test supply connected to the charger at J2 because the charger loads the test-voltage supply and causes the voltage to drop a little when it’s connected.

Continuing to apply When voltage is between The charger is now fully automatic maintaining the battery in a charged condition and adjusting to varying load conditions. If you have further questions related to this thread, you may click “Ask a related question” below.

Because the charger is current limited to mA, it is not able to keep up with the transmitter demands. With no charge current flowing to the battery, its voltage now begins to drop.

Apr 2, 2: Ask a related question Ask a new question.

For the scope plot,which scope should i need to take??? Slowly increase the test voltage again until D3 turns red.

Mar 25, 4: Which one is this designed for? This works great-until you attach a light load to the battery, such as turning on the K2 receiver. My first attempt at keeping my K2’s SLA battery healthy was to purchase an automatic three-mode charger. Now when the K2 receiver is turned on and begins drawing mA from the battery, the battery voltage drops more quickly so the pulses widen the duty cycle increases to supply a higher average current to the battery and make up for that taken by the receiver.


The charger circuit requires 18 to 22 volts DC input. Now it takes much longer for the charger to supply the battery with the power used during uv3906 than it would have if the charger had switched to absorption mode.

An automatic sealed-lead-acid battery charger

The battery voltage must now drop to approximately Both undercharging and overcharging need to be avoided if we want to get maximum service life from the battery. Chargers using the UC SLA charge-controller IC work just like the three-mode charger described earlier except that their return from float mode to absorption mode is based on voltage rather than current.

I cu3906 discovered that most three-mode chargers work by sensing current and were never intended to charge a battery under load. Now I can leave my K2 connected to the charger at all times and be assured that its internal battery is fully charged and ready to go ud3906 a moment’s notice. SLA batteries must be recharged on a regular basis. Mentions Tags More Cancel. Note that the mounting tab on U1 is not at ground potential. A Schottky diode is used at D4 because of its low voltage drop 0.

Although my SLA battery experiences related here are linked to my K2 transceiver, you can think of the K2 simply as a load for the battery.


If it is not exactly If the potential is Some companies have developed special integrated circuits that meet the mentioned criteria. Like the three-mode chargers, when a battery with a low terminal voltage is first connected to the charger, a constant current of mA flows to the battery.

UC3906 LED Indicator Problem

As with the three-mode charger, the battery is subject to being overcharged. The circuit u3c906 placed in a housing DIL Use of the information on this site may require a license from a third party, or a license from TI.

When the battery voltage reaches When we unkey the transmitter, we’re back to the situation where the charger is locked in absorption mode until we turn off the receiver. When the K2 is turned on again, because the charger is able to supply the mA for the receiver, the battery uc9306 doesn’t drop, so the charger stays in float mode and all is well.

An SLA battery can be left in this floatcharge condition indefinitely without overcharging it. Because the repetition rate is very low a maximum of one current pulse kc3906 four seconds no RFI is generated that could be picked up by the K2 receiver.

If an SLA battery is left unused, it will gradually self-discharge.

Three optical LED indicators show the charge state.