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UCC1890 Datasheet(PDF) 1 Page - Texas Instruments |
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UCC1890 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 9 page 3/97 DESCRIPTION • Transformerless Off-Line Operation • Low Voltage Operation to 0.8V • Ideal for Battery Trickle Charger Applications • Current Mode Operation With 100mV Shunt • Voltage Mode Operation With Fixed 1.25V Output or Resistor Adjustable Output • Efficient BiCMOS Design • Inherent Short Circuit Protection The UCC3890 controller is optimized for use as an off-line, low power, low voltage, regulated current supply, ideally suited for battery trickle charger applications. The unique circuit topology used in this device can be visual- ized as two cascaded flyback converters; each operating in the discon- tinuous mode, and both driven from a single external power switch. The significant benefit of this approach is the ability to charge low voltage bat- teries in off-line applications with no transformer, and low internal losses. The control algorithm used by the UCC3890 forces a switch on time in- versely proportional to the input line voltage, while the switch off time is inversely proportional to the output voltage. This action is automatically controlled by an internal feedback loop and reference. The cascaded con- figuration allows a large voltage conversion ratio with reasonable switch duty cycle. While the UCC3890 is ideally suited for control of constant current battery chargers, provision is also made to operate as a fixed 1.25V regulated supply, or to use a resistor voltage divider to obtain output voltages higher than 1.25V. UCC1890 UCC2890 UCC3890 Off-Line Battery Charger Circuit FEATURES BLOCK DIAGRAM UDG-96052 Note: This device incorporates patented technology used under license from Lambda Electronics, Inc. |
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