Introducing the characteristics of UCC3890, including low power, low voltage, and can be used for battery trickle charging.
The document describes the Unitrode UCC1890, UCC2890, and UCC3890 controller family, which are optimized for use as off-line, low power, low voltage regulated current supplies. These devices utilize a unique cascaded flyback converter topology to charge low-voltage batteries without requiring an external transformer.
| Minimum Operating Current (TON) | 1.65 mA typ, 2.0 mA max |
|---|---|
| Undervoltage Lockout Minimum Voltage to Start | 7.8 V typ, 9.2 V max |
| Reference Level (Voltage Output) | 1.25 V typ |
| Current Sense Amplifier Gain | 12.5 mA/V typ |
| Current Sense Amplifier Input Offset Voltage | 0 mV typ, +/- 5 mV max |
They are ideally suited for battery trickle charger applications.
No, the unique circuit topology allows off-line operation with no transformer.
The devices support low voltage operation down to 0.8V.