AP8804

AP8804

Document number: DS32050 Rev. 2 - 5

5 of 9

www.diodes.com

February 2010

© Diodes Incorporated

A Product Line of

Diodes Incorporated

Typical Characteristics (Cont.)

Channel 1 (Upper): V_Bias @ 0.5V/div

Channel 2 (Lower): I_Out @ 100mA/div

Timebase: 2us/div

Pulse Response R_Bias 4.1k

0mA

0V

0V

0mA

Channel 1 (Upper): V_Bias @ 0.5V/div

Channel 2 (Lower): I_Out @ 20mA/div

Timebase: 2us/div

Pulse Response R_Bias 21.0k

PIN Descriptions

NAME

I/O

Pin #

FUNCTION

NC

-

1

No connection. May be grounded or left floating.

GND

Power

2

GND or the most negative terminal of the LED Driver. Also carries the LED return

current.

BIAS

I

3

The output of an internal voltage reference (1.0V approx.). Connect a resistor RBIAS from

this pin to the external control input. The LED Driver amplifies the RBIAS resistor current

by a factor of nominally1000. Open circuiting this pin or driving this pin to >1.25V will

turn off the output of the AP8804. Avoid unnecessary stray capacitance at this pin, and

connect RBIAS as close as possible to it.

VCC

Power

4

The supply input pin of the LED Driver. This pin supplies the internal circuitry of the IC

which is typically 80uA + 2.5% of the LED output current. It is advisable to decouple this

pin with a 100nF capacitor to GND.

NC

-

5

No connection. May be grounded or left floating.

OUT

O

6

The output of the LED Driver, normally connected to the cathode of the LED. The

normal working range of this pin is 0.1V (0.1V above GND pin potential) to 6V. It is

permissible for the voltage on this pin to be higher than VCC.