Zetex released the highly integrated ZXLD132X series LED driver

Zetex Semiconductors (Zetex) launched three models of flexible light emitting diode (LED) driver, provide performance of the next generation of high brightness LED required for the design staff. The new ZXLD132X inductor DC to DC converter series can drive buck, boost and buck / boost configurations with single or multiple 700mA to 1.5A current LED. These drives are available in a small 3 x 4mm DFN package, which reduces the area of existing solutions to half of the area.

The new chip uses an innovative variable on / off time control circuit, which has an adjustable peak switching current limit and is simpler to control than other pulse frequency modulation (PFM) solutions. These drives also help to accurately and independently set the LED current and peak inductor current.

A feedback control circuit with ZXLD132X load and excellent current regulation function, extended operating temperature range can be effective during the life of the battery and -40 and 125 DEG C, with typical LED current stability of plus or minus 3%. By applying a DC voltage signal, the LED current can be reduced from 100% of the preset value to a factor of 10%, and the current can be reduced to by using a pulse width modulation (PWM) input.

The highly integrated ZXLD132X LED driver family also features a thermal control circuit that monitors the external thermistor to reduce the output current at a temperature exceeding a predetermined threshold. If the low level DC voltage signal is applied, the device can be turned off.

Zetex vice president of Asia Hu Guangfa said: "with the DC - DC converter, accurate stable current output current monitor, thermal control circuit and the strong performance of 2A NPN switching transistors integrated in DFN small package, we can allow customers to achieve the maximum luminous flux output using the most advanced LED technology. "

As the first launch of the new series of products, ZXLD1320 Buck Driver can provide a continuous LED current of up to 1.5A in the 4V to 18V input voltage range. The device can realize the maximum power of 24W according to the choice of the power supply voltage and the external device. The device is suitable for halogen lamp replacement and battery powered applications.

ZXLD1321 is a boost driver that operates in the 1V to 12V input voltage range, providing 1A LED current. ZXLD1322 is a buck / boost driver that provides 700mA current in the 2.5V to 15V input voltage range. Two devices are suitable for high-power LED flashlight, LED backup lighting and general LED driver applications.

Source: automotive electronics design