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Safety and protection monitoring LED driving chip

A technology of LED driving and security monitoring, which is applied in the field of security monitoring, can solve the problems of large PCB board area and high system reliability risk, and achieve the effects of reduced circuit PCB board area, stable and reliable trigger level, and high efficiency

Active Publication Date: 2016-07-06
SINOTECH MIXIC ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a security monitoring LED drive chip, which solves the problems of the existing similar technologies with large overall PCB board area and high risk of system reliability

Method used

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  • Safety and protection monitoring LED driving chip
  • Safety and protection monitoring LED driving chip
  • Safety and protection monitoring LED driving chip

Examples

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Embodiment Construction

[0011] The present invention will be described in detail below with the best embodiment 。

[0012] Such as figure 2 As shown, when the LED constant current drive circuit is in use, the sampling resistor, LED light string and inductor need to be connected in series between the power supply VIN and the power tube drain LX. As the overall enable signal of the constant current drive circuit, the ENA terminal is used to control the operation or shutdown of the constant current drive circuit. The ISE terminal detects the voltage drop on the external sampling resistor. As the current flowing through the LED increases, the voltage drop will increase accordingly. At this time, due to the effect of the internal amplifier AMP, the current flowing through the MOS tube MP will increase, thereby increasing the voltage drop on R2 and R3. The function of the internal comparator COMP is to compare the voltage drop on R2 and R3 with the internal reference signal BANDGAP. When the voltage dr...

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PUM

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Abstract

The present invention discloses a safety and protection monitoring LED driving chip, and relates to a LED driving chip for a safety and protection camera. The chip is an integration circuit, the pin IRC of the integration circuit is the state output end of a camera optical filter switch IR_CUT, and the state output end is connected with the camera optical filter switch IR_CUT; the pin VREF of the integration circuit is the output end of a stabilized power supply in the chip and connected with a light dependent resistor R1 and a divider resistor R2; the light dependent resistor R1 and the divider resistor R2 are connected with the pin EN end of the voltage division point integrated circuit; and the pin LX of the integrated circuit is a drain electrode of a power tube in the chip, a sampling resistor RS, a diode LED and an inductor L1 are connected in series between a pin VIN and the pin LX, and a diode D1 is connected between the pin VIN and the pin LX. According to the invention, the problems are solved that the area of the whole PCB is large and the reliability risk of the system is large in the prior art.

Description

technical field [0001] The invention relates to the technical field of security monitoring, in particular to an LED driver chip for a security camera. Background technique [0002] In order to achieve the best graphics effect, existing security monitoring cameras usually need to automatically switch the camera filter switcher IR_CUT filter according to the intensity of external light, and at the same time cooperate with LED for lighting. The traditional solution is to use an LED constant current driver, plus a general-purpose 555 circuit to form a trigger, a photosensitive component and some peripheral resistors and capacitors. Photosensitive components usually use photoresistors, photodiodes, and phototransistors. Such as figure 1 As shown, taking photoresistor R1 as an example, this resistor and resistor R2 form a voltage divider to divide the voltage of Zener diode DZ, and the voltage divider point is connected to the trigger input point TRIG of the subsequent 555 circu...

Claims

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Application Information

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IPC IPC(8): H05B37/02
Inventor 胥锐王敬冉建桥
Owner SINOTECH MIXIC ELECTRONICS
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