2/Theory of Operation
1503-0151-000 3/27/97 2-13
The charge time for the sealed acid battery, from a discharged state to full capacity
is 10 hours maximum.
ac to Battery Automatic Switch Circuit
Multiple Outputs dc to dc Converter
A single dc bus voltage, either from the ac to dc converter or the battery, is the input
to a dc to dc converter (MAX 796) similar to that used in the ac/dc section. The
converter has the five outputs required by the system at appropriate power levels.
Post low-drop regulators provide the most effective local regulation and high effi-
ciency with over current limiting and thermal shutdown protection. The 15V and
5RS_VAUX outputs are 10VA limited and go through 10VA limit circuitry before be-
ing sent to the SIB board and the pneumatic isolation area.
Voltage Rails Specifications
Outputs
Ripples
• Charge levels Bulk charge, over charge and tempera-
ture compensated floating charge
• Bulk charge current 250mA (c/10).
• Over charge voltage
14.7V at 25
o
C
• Floating charge voltage
13.7V at 25
o
C.
• Auto Charger Disconnect 7.56 to 8.08Vdc.
• Auto Charger Disconnect Release 7.71 to 8.71Vdc.
• Battery connection Direct on dc bus.
• Battery standby current < 200 uA.
• Digital logic 5 Vdc +3.685% to -3.05% 5W Max.
• +15V 15 Vdc +15.75 Vdc to + 14.25 Vdc 2W Max.
• -15V -15 Vdc -15.75 Vdc to -14.25 Vdc 2W Max.
• EL Display 10 to 15 Vdc 10W Max.
• VAUX 5.8 Vdc 6.09 Vdc to 4.99 Vdc 7.7W Max.
• 5 VCC < 50 mVp-p
• 5.5 Vdc < 100 mVp-p
• 12 Vdc < 200 mVp-p
•
±
15V < 100 mVp-p
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