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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 V_DCB. The values are listed in Table 2 and may be different for other parts.
Table 2. DS3994 LCM and OVD Thresholds (for Figure 1)

Parameter	Symbol	Min	Typ	Max	Units
Lamp off threshold	V_LOT	0.30	0.40	0.50	V
Lamp overcurrent threshold	V_LOC	1.80	2.00	2.20	V
Lamp regulation threshold	V_LRT	0.94	1.00	1.06	V
OVD threshold	V_OVDT	0.90	1.00	1.10	V

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