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7
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11
TDK-Lambda
DBM20
INSTRUCTION MANUAL
PA640-04-01B
4-13. The Block Diagram
AC MAINS
INPUT/OUTPUT
voltage
Bulk capacitor
voltage
Ready Signal
Buffer Signal
Charging
. Mode
Ready
Mode
Buffering
220V
Hold-up Time Power Supply
Buffer Time
Inhibit Signal
DC OK
Ready
Mode
Ready
Mode
Buffering
Inhibit
(5)
While buffering take place, buffer signal will change from logic low to high. And Ready signal will change from
logic high to low.
(6)
During the upstream power supply is still turn ON case and customer system will like to activate the inhibit
function by pulling inhibit signal from logic high to logic low, the buffer module will shut down the internal
converters and bulk electrolytic capacitors will be discharged in 3 ~ 5s.
(7)
Once the inhibit function is deactivated, buffer module will resume to normal operation automatically.
