BL-C140CE, BL-C140E, BL-C160CE, BL-C160E - Panasonic Video Monitoring Service Manual (repair manual). Page 13

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Package: 8 pin SOP
DC-DC converter IC for low voltage drive for lighting the LED light
Built-in FET
IC351 (on your right when facing front of camera) / IC353 (on your left when facing front of camera)

Package: 8 pin SOP
Operating Power Supply: +3.3V (+A3.3VS)
Resistance voltage for current detection is amplified and input to DC-DC converter.

Forward voltage:Max4.4V

The DC-DC converter IC (IC351 / IC353) outputs voltage so that about 300 mA of current flows to the white LED.
The voltage of resistors R362 and R363 for current detection is amplified by the operational amp (IC352) and input to the DC-DC
converter for low voltage drive. light is turned off/on by CPU (IC101) via transistor (Q351). 

*light is not lit in the case of low input voltage to the sensor camera.

Operating Power Supply: +3.3V (+A3.3VS)
Output voltage varies according to brightness. (0 ~ 2.6 V)

Package: 8 pin SOP
Operating Power Supply: +3.3V (+A3.3VS)
Output voltage of the lighting intensity sensor alters the signal if signal amplitude exceeds the stipulated voltage range. 

If lighting of the sensor camera is set automatically, the brightness is detected by the lighting intensity sensor and the LED light is lit
automatically if it is dark.