Preface
Security and surveillance have become an indispensable part of modern society, and network cameras have been widely used in homes, businesses, and public places. Compared with the previous surveillance cameras, the network camera has not only achieved significant improvement in image quality and function, but also has better and better performance in power management, environmental adaptability and intelligence. As an important part of the surveillance system, IP cameras play a vital role in preventing crime, ensuring security, and improving management efficiency.
Recently, when dismantling a network camera, the charging head network found that it used a one-stop solution for the periphery of Toll Micro network camera, in which the PoE power receiving PD chip, switch step-down chip, LDO, motor driver chip and LED light driver chip are all from Toll Micro. Next, the charging head network will introduce this scheme in detail.
One-stop solution for Tor micro network cameras
The one-stop solution of Toll Micro network camera includes the following chips: PoE powered PD controller chip TMI7301, synchronous step-down chip TMI3108, LDO regulator chip TMI6030, LED driver chip TMI5101 and motor driver chip TMI8113.
TMI7301 enables the camera to receive both power and data via an Ethernet cable. TMI3108 converts the high voltage of the input to the low voltage required by the camera. TMI6030 provides a stable voltage output that keeps the output voltage stable even when the input voltage or load changes. TMI5101 is used to control the infrared LED light to ensure that the camera captures clear video images even at night. Finally, the filter switching mechanism is TMI8113 controlled, so that the camera automatically switches filters during the day and night to adapt to different lighting conditions. During the day, the filter blocks infrared rays and prevents the image from being overexposed; At night, the filter is removed to allow infrared light to pass through, working with an infrared LED light.
This solution greatly simplifies the camera design and manufacturing process, while significantly improving the performance and stability of the camera, providing camera manufacturers with a highly integrated, high-performance option to differentiate themselves from the competition.
Next, the charging head network will introduce these chips in detail.
POE受电PD控制器芯片TMI7301
TMI7301 is a POE powered PD controller chip launched by Toll Micro, which supports 15W output power. The chip integrates a 100V withstand voltage 0.6Ω conduction resistance MOS transistor in an SOP8 package, which can provide a complete interface for the powered device (PD), making it compliant with the IEEE® 802.3af standard in Power-over-Ethernet (PoE) systems.
TMI7301 Provides PDs with intelligent maintenance power signature (MPS), detection signature, hierarchical signature, and integrated isolated power switch with inrush current control. During a surge, TMI7301 limits the current to less than 150mA and then switches to a higher current limit (400mA to 500mA) when the isolated power MOSFET is fully turned on. The chip features a wide hysteresis and long debounce time UVLO power input pin to compensate for the resistive voltage drop over twisted pair cables and ensure trouble-free transitions during power switching.
TMI7301 Withstands input voltages up to 100V. TMI7301 also provides a PGOOD (Power As Normal) signal with selectable logic and surge completion delays, two levels of current limit and fallback, and overtemperature protection. TMI7301 automatically generates the required pulse current to maintain PSE power without the need for additional dummy loads. This function can be enabled by means of an external resistor and the MPS pulse current amplitude can be programmed.
TMI7301 suitable for VoIP phones, security camera systems, remote Internet power supplies, secure backup power supplies, network cards, and more.
同步降压芯片TMI3108
TMI3108 is a 5.5V input synchronous step-down converter with an output current of 1A, designed for portable devices that can switch to PFM mode at light loads for improved efficiency.
The device integrates a main switch and synchronous rectifier without the need for an external Schottky diode and achieves up to 96% conversion efficiency at a 3.3V output. TMI3108 supports an input voltage range of 2.5V to 5.5V, an output voltage adjustable as low as 0.6V, and operates at 100% duty cycle in low-dropout operation for extended battery life.
In addition, the TMI3108 features a variety of protection features, including short-circuit protection, thermal fault protection, and input overvoltage protection (OVP), supports 1.5MHz high-frequency switching operation, slope-compensated current-mode control, and has excellent linearity regulation and transient load response. Housed in a SOT23-5 package, it is easy to integrate into a wide range of portable devices.
LDO稳压芯片TMI6030
The Toll Micro TMI6030 is a low quiescent current high PSR regulator with an output current of 300mA, fast transient response and high PSRR, providing high output accuracy, low dropout voltage, low quiescent current, and fast start-up time.
The TMI6030 design is based on a CMOS process and is suitable for low ESR ceramic capacitors, reducing the PCB area required for power applications. The output voltage of the TMI6030 can be set with an external resistor divider ranging from 1.2V to 5V and is available in a fixed output voltage version with overcurrent protection and thermal shutdown. TMI6030 is available in DFN4L 1×1 and SOT23-5 packages for easy integration.
The TMI6030 has an input voltage range of 2.5V to 5.5V, a typical dropout voltage of 320mV (@300mA), quiescent current as low as 50μA, and shutdown current less than 1μA. It has a PSRR of 70dB at 1kHz and has the stability of a 1μF ceramic output capacitor and an output accuracy of ±2%.
TMI6030 are current limited protection, thermal shutdown, and output auto-discharge in shutdown states, RoHS compliant, and lead-free and halogen-free.
LED驱动芯片TMI5101
Toll Micro TMI5101 is a constant frequency current mode PWM step-down LED driver chip, which is used to drive infrared fill light in this scheme, the internal architecture of the chip is synchronous step-down architecture, internal integrated switch tube, chip switching frequency is 1.5MHz, support 1A output current, support 100% duty cycle output, with short circuit protection and overtemperature protection, using SOT23-5 package.
The TMI5101 integrates a master switch and synchronous rectifier to achieve high efficiency without the need for an external Schottky diode, and offers two modes of operation: PWM control and PFM mode switching control, allowing it to maintain high efficiency over a wider range of LED currents. With a typical feedback voltage of 0.1V, it provides stable performance at low voltages.
TMI5101 also integrates a variety of protection features, including input over-voltage protection (OVP), cycle-by-cycle current limiting, and over-temperature protection, making them excellent in driving LED applications.
Motor driver chip TMI8113
Toll Micro TMI8113 is a DC motor driver IC designed for systems operating at low input voltages, in which it is used to drive filter switching coils, supports 7.2V working voltage, and supports motor forward and reverse rotation, stop and brake functions.
TMI8113 Built-in temperature protection function, when the chip temperature rises sharply, the internal circuit turns off the built-in power switch to cut off the load current. THE CHIP IS ROHS COMPLIANT, HAS A 100% LEAD-FREE LEADFRAME, AND IS AVAILABLE IN A SOT23-6 PACKAGE.
TMI8113 详细资料。
Summary of the charging head network
In the modern monitoring system, Toll Micro's one-stop solution not only simplifies the design process, but also improves the stability and performance of the system through its PoE powered PD controller, synchronous step-down chip, LDO regulator chip, LED driver chip and motor driver chip, providing a strong technical support for camera manufacturers, and also bringing excellent experience to end users.