1.5A Switching Charge Management Chip: HL7005
As a professional manufacturer of high-performance power management chips, Xiyu Microelectronics Co., Ltd.'s self-developed fast-charge chip HL7005 is widely used in mobile terminals such as mobile phones/tablets and mobile power supplies. The chip provides a single-cell lithium that meets USB charging specifications. The ion-cell switching-type charge management solution integrates an efficient and environmentally friendly DC-DC synchronous rectification step-down device operating at 3MHz to provide up to 1.5A of charging current for Li-Ion batteries. Compared with the traditional linear charging scheme, the fast charging chip HL7005 has the advantages of shorter charging time, less heat generation, higher voltage/current precision, more convenient system control and more comprehensive protection. With its excellent quality and performance, HL7005 has passed the test certification of many platform manufacturers such as MTK, Spreadtrum and Lianxin, and is included in the reference design.
The HL7005 offers a complete, fully automatic three-stage charge management: trickle precharge, high current constant current charging and constant voltage charging. When the battery voltage drops below the internal threshold, the chip automatically restarts the charging cycle. If the input power is disconnected, the chip will automatically enter a high-impedance mode that prevents battery current from leaking to the input. When the chip temperature reaches 120 ° C, the chip will automatically reduce the charging current to prevent the chip from overheating.
The HL7005 has three operating modes: charge mode, boost mode and high impedance mode. In charging mode, the chip provides a precision charging system for single-cell Li-Ion or Li-Ion polymer batteries. In boost mode, the chip raises the battery voltage to 5.0V and the VUSB acts as an output to power the OTG device. In high-impedance mode, the chip stops charging or stops boosting, presenting a high-impedance state, at which point the current drawn from the VUSB and battery terminals is small. This mode effectively reduces power consumption when the handheld is in standby. The host communicates with the HL7005 through I2C (so-called host mode or 32-second mode), which enables the chip to switch smoothly in different working modes. In the absence of an I2C host, the chip will start a 30-minute security timer and enter the 30-minute (default) mode. During 30-minute mode operation, the HL7005 will charge the battery based on the default values ​​of the registers.
The following figure is a functional block diagram of the HL7005:
Battery short circuit activation
Regardless of whether it is a mobile phone or a tablet, there are some practical application problems for the battery. Among them, the battery over-discharge activation problem and the battery short-circuit activation problem; if the battery is over-discharged for some reason, the battery power is almost It is completely consumed, and at this time it is subject to activation problems in the case of battery over-discharge. Since the HL7005 itself has a trickle charge function, it automatically charges the battery with a 30mA current when the battery voltage is lower than 2V. In this way, the battery is automatically activated not only to be safely charged.
The need for battery short-circuit activation is more likely to occur during handset assembly on the production line. For wire-wound batteries, the battery may be short-circuited online during the assembly process of the main board due to possible operator error. At this time, the battery itself will enter the short-circuit protection. Even if the battery itself has power, it cannot provide external voltage, so it is necessary to take measures to activate the battery. The traditional method of activation is to manually apply a higher voltage to the battery from the outside before the battery is shorted. However, this method is inefficient and not suitable for automated production requirements. The HL7005 integrates a battery activation function. After the short-circuit protected battery is connected to the HL7005, it is automatically activated and then starts normal charging.
This is one of the important advantages of the HL7005 compared to similar products. The addition of the battery activation function has also been recognized by MTK.
OTG boost function boost
With the popularity of OTG function applications, consumers are using more and more types of OTG peripherals, not only for external USB flash drives, mice, but also for Internet cards, hard drives and other devices. The HL7005 OTG's output capability is 5V/650mA, which meets customers' needs for larger current peripherals compared to the traditional standard of 500mA. This is another application feature of the HL7005.
to sum up:
HL7005 has made many optimizations and improvements in performance parameters. While realizing fast charging, it can also meet more application scenarios and external devices. We hope that HL7005 can become the engineer of mobile phones, tablets and other mobile terminals with its high cost performance. The best choice for design and development of equipment fast charging solution.
COB Light
COB LED par light for theatre, productions, TV studio, stage
Description:
COB200-2in1 is a professional theatre fixture that utilizes a 200W warm-white and cold-white COB LED with a color temperature of 3200k-6000K. Users are able to creat a customized color tempreature via a DMX Controller or set directly on the display menu. It offers a high-power light output with rich hues and smooth color mixing for stage and wall washing. The double bracket makes installing easily and versatile.
Our company have 13 years experience of LED Display and Stage Lights , our company mainly produce Indoor Rental LED Display, Outdoor Rental LED Display, Transparent LED Display,Indoor Fixed Indoor LED Display, Outdoor Fixed LED Display, Poster LED Display , Dance LED Display ... In additional, we also produce stage lights, such as beam lights Series, moving head lights Series, LED Par Light Series and son on...
COB Light Series,Led Par Light,54 Led Par Light,Par Led Lights
Guangzhou Chengwen Photoelectric Technology co.,ltd , https://www.cwstagelight.com