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UCC1890 Datasheet

  • UCC1890

  • Off-Line Battery Charger Circuit

  • 8頁

  • TI

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UCC1890
UCC2890
UCC3890
Off-Line Battery Charger Circuit
FEATURES
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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
DESCRIPTION
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.
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BLOCK DIAGRAM
Note:
This device incorporates patented technology used under license from
Lambda Electronics, Inc.
UDG-96052
3/97

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