DS3994应用电路

DS3994应用电路 Application with a single lamp per channelIn this application the internal DC bias voltage at the LCM and OVD pins allows for an AC-coupled input. This design can make the external circuitry very simple. A typical operating circuit for this application is shown in Figure 1.
  
  
  Figure 1. Typical operating circuit with a single lamp per channel.
  
  In this application, the thresholds are referenced to VDCB. The values are listed in Table 2 and may be different for other parts.
  Table 2. DS3994 LCM and OVD Thresholds (for Figure 1) ParameterSymbolMinTypMaxUnitsLamp off thresholdVLOT0.300.400.50VLamp overcurrent thresholdVLOC1.802.002.20VLamp regulation thresholdVLRT0.941.001.06VOVD thresholdVOVDT0.901.001.10V