At present, LED drivers are developing towards intellectualized direction, and foreign countries are competing to develop a large number of DC/DC LED driver IC with bus interface that can be adapted to microcontrollers. Its characteristics are with single-line interface, IC interface, SMBus interface, SPI interface and other serial interface, also some chips with serial, and the export interface. Digital dimming and function expansion can be realized by using microcontroller
Programmable hb-led driver
The significant characteristic of programmable LEI driver is that it can program the parameters such as train current to achieve the best lighting effect. Typical products are programmable LED drive mation (MAXIM.) the company produces the type MAX16816 programmable switch mode with single wire interface tunable high brightness LED light (HB) - LED drive controller, LingLiEr (LT) company production of LTC1734 type constant current source controller, programmable large current Chinese Taiwan area point crystal technology co., LTD., production type DD311 programmable power constant current drive, hangzhou soil microelectronics company developed SD42509, S42522 step-down type programmable high-power LED drive. The following are the main features and typical applications of MAX16816.
The main features of the MAX16816
(1)MAX16816 is internally integrated with all circuits required by HB LED drive controller, with wide range brightness control and E2PROM programmable LED current regulation function. The current of hb-led is adjusted by two external n-channel MOSFET.
(2) the device can be configured in a variety of topologies, including buck, boost buck/boost or SEPC constant-current drivers
(3) it is a high-voltage, high-power hb-led drive controller. The input voltage range is U1=+5.9~76V. The maximum output current IoM= 1.33a, the output current accuracy is ±5%, the power supply efficiency can reach above 90%.
(4) the internal E PROM has a single-wire bus (1Wire) interface, which facilitates communication with the external MCU (pC)
(5) the user can program soft start, LED current, external MOSFET gate driver power voltage, slope compensation, blanking time and enable/disable internal PWM oscillator through the EZ PROM register, and can also set the switching frequency within the range of 125~500kHz through the external resistor, and realize the synchronization of multiple chips MAX16816.
(6) using analog dimming or digital dimming, the dimming ratio of 1000:1 can be achieved at low frequency.
(7) with digital soft start, input under-voltage protection, output over-voltage protection, over-current protection, LED short-circuit protection and other functions. Standby current in off mode is less than 45A.
(8) TQFN32 package is adopted, the external size is only 5mm×5mm, and the operating temperature range is -40+125C.
The MAX16816 has a wide range of applications, including IFD taillights, fog lights, headlights, high beams, near-lights and turn signals, universal LED lights,LED emergency lighting,LED signs and LED lights.