Versatile LED driver increases reliability of high brightness lamps

The ZXLD1374 is a high accuracy 1.5A LED driver that can be used as a

▪ Buck converter

▪ Boost converter

▪ Buck-Boost converter.

The device can drive up to 16 LEDs in series from a voltage source of 6.5V to 60V. Series connection of the LED provides identical LED currents resulting in uniform brightness and eliminates the need for ballast resistors.

The ZXLD1374 switches at frequencies up to 1MHz, which allows the use of small size external components. This coupled with small footprint TSSOP-20EP reduces the required PCB area.

The Diodes advantage

The ZXLD1374 provide simple high reliability solution for driving multiple extremely high brightness LEDs in multiple topologies

◾ High accuracy LED control: 1 reference tolerance

Better brightness control and matching between lamps

◾ Multi-topology device

1 device can be used in buck lighting, boost light and buck-boost lighting apps

◾ LED thermal management via external thermistor

Improves reliability of LED lamps

◾ Separate 1000:1 PWM dimming capability

Improves dynamic range of dimming at lower light levels

◾ Switching frequency up to 1MHz

Reduces value of inductor reducing size of solution

◾ Two- pin diagnostic feedback pins

Reports back to system the state of LED driver and load can be used to increase reliability of overall system

Circuit functions

◾ Buck driving of 3W and 1W LEDs

◾ Boost and Buck-boost driving of 1W LEDs

◾ Constant Current Source

Typical Application:

Buck-Boost LED driver