This note describes an off-line autoranging (85Vac-264Vac) battery charger designed to operate in three differ- ent functional modes: – constant voltage – constant current – constant power
This document describes an off-line autoranging battery charger designed to operate in three functional modes: constant voltage, constant current, and constant power. The design is typical for notebook computer battery chargers and utilizes the L5991A controller.
| Input voltage | 85Vac to 264Vac |
|---|---|
| Regulated output voltage | 18V |
| Maximum output power | 25W |
| Switching frequency | 100kHz |
| Target efficiency | >80% @ full load |
| Topology | discontinuous current mode flyback |
The charger operates in constant voltage, constant current, and constant power modes.
The design uses the L5991A controller.
The maximum output power is 25W.