Acer AL2017 Manuel d'entretien - Page 9

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A voltage of 2V to pin10 of IC501 enables the IC and activates the striking timer. The SSTCMP

pin of IC501 performs the soft function, the C511 set the time of SST. The operation frequency

determined by external capacitor C512, C521 and resistor R508 connected at CT pin of IC501.

C515 connect the TIMER pin of IC501, the capacitor to set striking time and shunt down delay

time. DRV!, DRV2 output for power MOSFET U501, U502.

OZ9938 provides two drive signals for U501, U502, and they work in push pull topology

driving, two transformers are connected in parallel with each transformer driving two lamps in

series. Turning each N-Channel MOSFET "on/off" complementarily, produces an alternating

current through the transformer primary and secondary. The "on" duration of the switches

determines the amount of energy delivered to the CCFLs. R504, C504, R505, C505, R532, C529,

R530, C522 are snubber networks, they suppress Voltage transient spike in drain of power

MOSFET.

R506, R510, C509, C513, C514, R525, R531, C528, C525, and C527 are connected between

high voltage output connector and ground, the divided AC voltage is inverted DC voltage through

D502, D503, D508, and D509. The sense voltage feed back to VSEN (pin 6 of IC501) for an over

voltage/over current condition during normal operation. R528, R533,R523,R536 are current sense

resistor, current sense signal feed back to Isense (pin 5 of IC501) for lamp "ON" detection.

Service Manual