Linear regulators are subject to power dissipation problems when switching voltages, and noise problems in switching modes. Which conversion method the LED driver chooses depends on which application.
——Bill Rypka Bill Rypka Muzahid Huda Maxim HB LED Driver Product Marketing Manager
What kind of conversion method
Switching voltages through a linear regulator can be a power hazard problem, which is more suitable for use in converter circuits that need to avoid noise (such as car audio) and therefore cannot be switched. The switching method is characterized by very high conversion efficiency, but it also has noise problems, so the choice of which conversion method depends on which application.
Generally, the efficiency of the charge pump drive mode varies with the input voltage. In applications with large voltage variations, the efficiency is relatively low. In applications where the voltage variation range is small, only the input and output voltages are used. When the relationship is an integral multiple, its efficiency can be maximized, but this is difficult to achieve in battery-powered applications. In contrast, the conversion efficiency of the inductor is not subject to voltage interference, and the application limit is less than that of the charge pump. Therefore, the current conversion circuit is mostly inductive.
How to evaluate performance
Objectively speaking, evaluating the performance of HB LED driver ICs depends on different applications and cannot be generalized. For example, in decorative lighting applications, the control requirements for RGB color changes are high, and this performance becomes the main indicator, which is not required in monochrome applications. For example, the application of narrow space requires heat dissipation capability; in automotive lighting replacement applications, it requires both smooth integration of the original circuit system and high reliability; in display applications such as NB, multiple strings of LEDs Brightness equalization control requires the driver IC to have precise control of the current on each branch. For example, Maxim's product control accuracy can reach 3%. The projector application requires high efficiency drive circuit, fast brightness adjustment and thermal protection. Capabilities; in alternative applications, performance is more manifested throughout the solution than on a single driver IC. In general, device integration, control quantity, response speed, fault diagnosis, heat resistance, etc. are all performance evaluation references.
Generally, the purpose of high integration is to improve performance, but at high power, high integration will increase the chip area in order to meet large currents, and also face heat dissipation problems while increasing costs. Therefore, how to balance power and integration The relationship is the subject of driving IC design. The driver IC should improve the package to solve the heat dissipation problem while improving the chip process to meet the cost.
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FUNCTION DESCRIPTION
Countdown socket has an AC outlet, the maximum can output 230 V16A of power, there are two control modes, that is, countdown off and countdown on. It is convenient to control the equipment which needs to switch off or turn on AC. improve the safety of the use of some equipment and save more energy.
SET Timer
1,Countdown plug in the socket, all indicator lights red flash three times, at this time the socket has no output, for the normal state, into the countdown state. Click the button, the first red light up, the socket output after an hour off, and then short press the button can set the socket timing of 2 H.4H.6H.8H.10H.OFF.
2,Long press button 3s, all indicator lights green flash three times, at this time the socket has output, for the regular open state, into the countdown on state. Click on the button, the first green light on, the socket is closed an hour later, and then press the button to set the socket countdown 2 H.4H.6H.8H.10H.OFF.
3,Press button 3 longer S, all indicator lights red light flash 3 times again into countdown mode.
4,Select the required countdown time mode, the corresponding mode countdown lights up, start countdown until the end of the countdown time. The outlet that controls the output will start or stop the output.
5,After the countdown starts, the time indicator will change automatically from high to low until the countdown is over.
NOTE:
1,Check that the power connection is good.
2,Use only indoors and in dry places.
3,This product does not convert AC voltage.
4,Maximum load not exceeding 16A 3680W.
5,Grounding is required for safety.
6,Any questions, please contact the electrician.
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NINGBO COWELL ELECTRONICS & TECHNOLOGY CO., LTD , https://www.cowellsocket.com