DESCRIPTION

The AP8802EV2, Figure 1, is a PCB constructed using an FR4 base for evaluating the AP8802 LED driver with internal switch in the SOP 8L-EP package. The evaluation board can be used to drive an external choice of LEDs; the total forward voltage across the LEDs depending on the number and type connected. [1]

The suggested operating voltage for the evaluation board ranges from 8V to 45V maximum. Higher voltage means lower supply current.

The nominal current for the evaluation board is set at 1A with a 0R2 sense resistor, R1.

Test point CTRL provides a connection point for DC or PWM dimming and shutdown.

AP8802 DEVICE DESCRIPTION

The AP8802 is a step-down DC/DC converter designed to drive LEDs with a constant current. The device can drive up to thirteen LEDs, depending largely on the forward voltage of the LEDs in series, from a voltage source of 8V to 48V. Series connection of the LEDs provides identical LED currents, resulting in uniform brightness and eliminates the need for ballast resistors. The AP8802 switches at frequencies up to 500KHz. This allows the use of small size external components, hence minimizing the PCB area needed.

AP8802 DEVICE FEATURES

• LED driving current up to 1A

• Input voltage from 8V to 48V

• High efficiency up to 92

• High switching frequency up to 500KHz minimum

• PWM/DC input for dimming control

• Built-in soft-start function

• Built-in output open-circuit protection

• SOP-8L, MSOP-8L, DFN3030-10 are available in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish/RoHS Compliant

DEVICE APPLICATIONS

• Commercial & industrial lighting

• Small LCD panel backlighting

• Appliance interior lighting

• Architecture detail lighting