TDK-Lambda PH-A280 Series Instruction Manual - Tdk-Lambda
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TDK-Lambda
PH-A280 Series
INSTRUCTION MANUAL
6-11. ON/OFF Control (CNT terminal)
Without turning the input supply on and off, the output can be enabled and disabled using this function. This
function also can be used for output sequence of plural power supply.
ON/OFF control circuit is on the primary side (the input side). For secondary control, isolation can be achieved
through the use of a photo-coupler or relay.
Table 6-3 CNT Terminal Level
Note) 1. When ON/OFF control function is not used, CNT terminal should be shorted to –Vin terminal.
2. When using long wiring, for prevention of noise, attach about 0.1uF capacitor between CNT
terminal and –Vin terminal.
3.
At L level, source current from CNT terminal to –Vin terminal is 0.2mA–
0.3mA.
4. The maximum CNT terminal voltage is 35V.
(1) Output ON/OFF control (2) Secondary (output side) control
Fig.6-10 CNT Connection (1) Fig.6-11 CNT Connection (2)
(3) ON/OFF control when PH-A280 series is connected to PFC circuit.
When PH-A280 series is connected to PFC circuit, the signal that shows normal operation of PFC circuit
connect to CNT terminal of PH-A280 series, and add circuit so that PH-A280 series operates as follows .
When PFC circuit operates normally : Control ON (Output status : ON)
When PFC circuit does not operate : Control OFF (Output status : OFF)
Fig.6-12 CNT Connection (3)