DC1573A: 8 Chan, 3.3A @ 45V Max, 8 ~ 14V in

DC1573A is an 8-Channel 100mA High Voltage LED Driver featuring the LT®3760. The LT3760 drives up to 100mA per string and has a maximum LED string voltage of 45V. DC1573A is set at 1MHz switching frequency for smallest inductor and capacitor size as well as maximum PWM dimming performance. Overvoltage protection is set at 55V in case the LEDs are removed from the circuit. If the LEDs are opened, the FAULT terminal output flag goes low and reports the fault condition. The VIN terminal is powered from 10V to 14V input separated from the 24V PVIN supply for best thermal performance. If one or more of the 8 LED channels is not used, its LED pin or terminal should be tied to LED+ to disable it. Multiple channels can be used in parallel for higher LED current by tying their LED1-8 pins together.

The LT3760 data sheet gives a complete description of the part, operation and applications information. The data sheet must be read in conjunction with this demo manual for demonstration circuit 1573A. The LT3760 is assembled in a small 28-lead FE (4.4mm TSSOP) package with a thermally enhanced ground pad. Proper board layout is essential for maximum thermal performance. See the Layout Considerations section in the data sheet.