User Guide

Circuit Description
Samsung Electronics 4-11
4-7 Travel Charger
4-7-1 Description
- This specification describes requirements of TC55
travel charger. TC55 is designed as a wall-mount
type rapid charger for Li-ion battery (1CELL) for
SAMSUNG PCS phone SCH-2000.
- This charger includes AC/DC adapter circuitry
in its own board. This characteristic offers
operating with direct indoor AC input without
additional AC/DC adapter unit. And it is
connected by DC power cord to a phone with
battery.
- Integrated AC/DC adapter circuity adopts
switching mode power supply to keep lightness
of whole charger.
- Own bi-color LED indicates charging status of
battery.
- Charge current is automatically controlled by
programmed microprocessor inside of charger.
4-7-2 Electrical Characteristic
AC INPUT
- AC input voltage : 110/220 Vac
- AC input voltage range : 85Vac ~ 264 Vac
- AC input frequency : 60Hz
- Ac input power : 10W
OUTPUT
- Battery Charging Voltage : 4.1/4.2 V
- Battery Charging Voltage Range under C-V
mode : 4.1/4.2 (-0.2/+0.1V)
- Battery Charging Current : 0 to 700 mA
- Battery Charging Current Range under C-C
mode : 700mA °æ70 mA
- Efficiency : 55% min
- Ripple & Noise : 60mVp_p max (test condition :
At output contact with 20MHz bandwidth using
resistive load 650mA)
SAFETY REQUIREMENTS
Primary-Secondary Isolation
- Withstanding Voltage : 3000Vac min for 1 second
- Cut-put current : 10mA
- Isolation Resistance : 8 Mohm
LED INDICATION
AC PLUG IN : yellow for 1 second
Charging status
- Red : Charging
- Green : Charging termination
- OFF : Battery unloaded
- Yellow blinking : Error mode
- Yellow : Under or over temperature
ENVIRONMENTAL SPECIFICATION
Unit Operating Temperature Range : 1 to 45 °∆C
Storage Temperature : -20 to 85 °∆C
4-7-3 Schematic Description
MICOM CONTROLLER : U4
¶UU4 is include u-COM to controlled whole
charging system and include following internal
circuit.
- General input / output
- A/D converter
- Reset delay circuit (power on delay)
- Timer
¶UIt is carried following functions
- Battery recognition
- Charging termination condition detection
- Output short detection and output protection
- Temperature detection