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DS3994应用电路

发布人:dolphin 时间:2012-07-31 收藏

DS3994应用电路 Application with a single lamp per channel

In 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.
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)
ParameterSymbolMinTypMaxUnits
Lamp off thresholdVLOT0.300.400.50V
Lamp overcurrent thresholdVLOC1.802.002.20V
Lamp regulation thresholdVLRT0.941.001.06V
OVD thresholdVOVDT0.901.001.10V


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