The LTR3596 is a 60V step-down LED Driver. It achieves 10,000:1 digital PWM dimming at 100Hz with fast NPN current sources driving up to 10 LEDs in each channel. 100:1 LED dimming can also be done with analog control of the CTRL1-3 pin.

The step-down switching frequency is programmable between 200kHz and 1MHz and is synchronizable to an external clock. The LT3596 also provides maximum LED brightness while adhering to manufacturers’ specifications for thermal derating. The derate temperature is programmed by placing a negative temperature coefficient (NTC) resistor on the master control pin.

The LT3596 adaptively controls VOUT in order to achieve optimal efficiency. Other features include: 1.5% LED current matching between channels, open LED reporting, shorted LED pin protection and reporting, programmable LED current and programmable temperature protection.

LTR3596主要特性:

n 300mA Buck Regulator, Drives Up to 10 LEDs per Channel with Fast NPN Current Sources

n Fast Current Sources for <1μs Pulse Widths (10,000:1 True Color PWM? Dimming at 100Hz)

n LEDs Disconnected in Shutdown

n Adaptive VOUT for Increased Efficiency

n 6V to 60V Input Voltage Range

n ±1.5% Accurate LED Current Matching

n External Resistors Set LED Current for Each Channel

n Requires No External Compensation

n Programmable Switching Frequency (200kHz to 1MHz)

n Synchronizable to External Clock

n Open, Short LED Detection and Reporting

n Programmable LED Thermal Derating and Reporting

n Programmable Temperature Protection

n 5mm ??8mm Thermally Enhanced QFN Package with

0.6mm High Voltage Pin Spacing

LTR3596應用:

n LED Billboards and Signboards

n Mono, Multi, Full Color LED Displays

n Large Screen Display LED Backlighting

n Automotive, Industrial and Medical Displays

圖1.LTR3596方框圖

圖2.LTR3596典型應用:48V 降壓8W 100mA LED驅動器

圖3.LTR3596典型應用:24V 降壓4W 100mA LED驅動器

圖4.LTR3596典型應用:12V 降壓100mA 單象素RGB驅動器

圖5.LTR3596典型應用:48V 降壓10W 100mA LED驅動器