AP8800A

COST EFFECTIVE 28V BUCK 1-W LED DRIVER

AP8800A

Document number: DS35100 Rev. 2 - 2

2 of 12

www.diodes.com

January 2011

© Diodes Incorporated

Pin Descriptions

Pin Name

Pin Number

Descriptions

SW

1

Switch Pin. Connect inductor/freewheeling diode here, minimizing track length at this pin to

reduce EMI.

GND

2

GND Pin

CTRL

3

Dimming and On/Off Control Input.

• Input voltage of 0.2V or lower forces the device into low current standby mode and shuts

off the output. An open-drain/collector PWM signal allows the output current to be adjusted

below the level set by the resistor connected to SET input pin.

• The input impedance is about 50kΩ, and if the pin is left open V

• Drive with DC voltage (0.3V < V

SET

4

Set Nominal Output Current Pin.

Configures the output current of the device.

5

Input Supply Pin. Must be locally decoupled to GND with > 2.2µF X7R ceramic capacitor – see

applications section for more information.

Absolute Maximum Ratings

Symbol

Parameter

Ratings

Unit

-0.3~30

V

V

SW voltage relative to GND

-0.3~30

V

CTRL pin input voltage

-0.3 ~ 5

V

Switch current

0.45

A

Junction Temperature

105

°C

Lead Temperature Soldering

300

°C

Storage Temperature Range

-55 to +150

°C

Caution:

The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

exceeded under any condition.

Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when

handling and transporting these devices.

Recommended Operating Conditions

Symbol

Parameter

Min

Max

Unit

Operating Input Voltage relative to GND

8.0

28

V

Voltage range for 24% to 200% DC dimming relative to GND

0.3

2.5

V

Voltage Low for PWM dimming relative to GND

0.2

V

Continuous average switch current (Note 2)

370

mA

Duty cycle range applied to CTRL (f < 500Hz)

0.01

1

Switching frequency

600

kHz

Ambient Temperature Range

-40

105

°C

Notes:

2. Refer to figure 4 for the device derating curve.