DC1274A

DC1274A demo circuit features the LTM®8040 36V, 1A step-down constant current μModule® LED driver. The demonstration circuit is designed to drive a single LED or string of LEDs at up to 1A from a wide input voltage range. The maximum LED string voltage is 13V and the minimum voltage varies depending upon the BIAS pin supply arrangement. The demonstration circuit is assembled with the BIAS pin connected to the LEDA pin. The LTM8040 runs at 500KHz switching frequency by default. DC1274A can be adjusted to raise the switching frequency, lower the LED current, and implement PWM dimming. The shutdown feature can be examined by connecting the shutdown terminal to ground.

• Input voltage range from 4V to 36V at ILED = 1A, VLEDA = 3.3V, TA = 25°C
• 1A output current (ILED) at R3 = Open, TA = 25°C
• 500KHz switching frequency at R2 = Open
• 13V maximum output voltage (VLEDA), open LED voltage

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