The DLPA3000 can be supplied from either a battery pack or an adapter. The DLPA3000 uses several warning and detection levels to prevent system damage when the supply voltage drops below the predefined level or an interruption occurs.

For example, interruption of the supply voltage occurs when the adapter switches to another main outlet. If a battery pack is installed, the system power control should switch to the battery pack. A change of supply voltage from, for instance, 20 V to 8 V can occur, and thus the OVP level (which is ratio-metric; see Ratio Metric Overvoltage Protection) could become lower than V_LED. An OVP fault will be triggered and the system will switch off.

The ILLUM_LED_AUTO_OFF_EN (0x01, bit 2) function can be used to prevent the system from turning off in these circumstances. This function disables the LEDs when the supply voltage drops below LED auto off level. Keep the LED auto off level the same as the BAT_LOW_WARN (0x0C, bit 2) level. When the ILLUM_LED_AUTO_OFF_EN (0x01, bit 2) function is enabled, once a supply voltage drop is detected to below LED auto off level, the LEDs switch off and the system starts sending lower current levels to have a lower V_LED. After using lower currents, the LEDs can be switched on again by disabling the ILLUM_LED_AUTO_OFF_EN (0x01, bit 2) function. As a result, the system can continue working at the lower supply voltage using a lower intensity. The system monitors the BAT_LOW_WARN (0x0C, bit2) status, and once the main adapter is plugged in again (seen by BAT_LOW_WARN(0x0C, bit2) being low), the ILLUM_LED_AUTO_OFF_EN (0x01, bit 2) function can be enabled again. The LED currents can be restored to their original levels from before the supply voltage drop.