Power Supply Theory of Operation
2 - 38 0070-10-0441 Passport 2®/Passport 2 LT™ Service Manual
The Power Supply also provides a BATT-CHARGE output signal that is a logic “1” when
either charger is active (i.e. batteries are actually being charged). Otherwise, BATT-
CHARGE will be a logic “0”. In addition, the signal will be logic “0” if there is a charger
fault, such as open/shorted cell(s). The BATT-CHARGE output is capable of driving an
external LED, sourcing a minimum of 10mA.
During BATTERY operation (i.e. AC and DS-DC powers are not present), the power supply
latches off when the BATTERY voltage drops below 10.3V for SLA and 9.2V for Li-Ion. The
power supply unlatches when any one of the following occurs:
•The REMOTE-ON* signal is toggled off and on, provided that valid input power (AC,
DS-DC, or BATTERY) is present.
• AC or DS-DC power is applied.
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