Dell 2209WA Service Manual
Also see for 2209WA - UltraSharp - 22" LCD Monitor: Setup guideDatasheetUser guideSetup guide
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Service Manual8Electronic Circuit Theory2.1 Inverter PWM circuit2.1.1)Inverter Control circuit:(fig.2)4.1Fig.2ON/OFF voltage signal coming from IF BD will enable U1 to work.C2 isused to dump noise.During the striking period, if the voltage at VSEN_POL(pin12) reaches athreshold of approximately 2.85V, the transformer output voltage will beregulated until the striking timer expires.During normal operation, if the voltage at VSEN_POL(pin12) reaches thepresent voltage at OVPT(pin16), the sink and source current ofSSTCMP(pin14) will stop and the TIMER(pin15) will be charged. OnceTIMER(pin15) expires and the abnormal condition still exists, U1 willshutdown and latch.Once the IC is enabled, when the voltage at VREF(pin21) rises toapproximately 4.0V, before the transformer output is present, and voltage at |
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