PAM2811 datasheet(7/12 Pages) PAM

7 / 12 page

Power Analog Microelectronics Inc

www.poweranalog.com

Application Information

The PAM2811 is a 4-channel programmable

white-LED driver. It is capable of supplying 20mA

per channel with a total of 80mA output current

available. LED brightness control of PAM2811 can

be achieved with a Pulses signal.

The EN input is used to enable or disable the

PAM2811. Pulling the EN pin higher than 1.5V will

enable the device. For producing constant, non-

pulsating output current compare to conventional

pulse width modulation(PWM) dimming scheme.

The PAM2811 incorporates a 4-bit DAC for

brightness control to program the output current

at 16 continuous steps:20~1.25mA. Table1 shows

details for current setting.

Table 1 Current Setting

Page2 shows the detail operation of 16-steps

brightness control. When Single-wire pulse

counting dimming is used, the ready time is

recommended to be greater than 30us for

enabling the device, the pulse high time THI

recommended to be greater than 0.5us, and the

pulse low time T

is recommended to be greater

than0.5us and less than 500us. A constant current

is sourced as long as the EN signal remains high.

The shutdown feature reduces quiescent current

to less than 0.1uA.

The

PAM2811

equips

over

temperature

protection. When the junction temperature (T )

exceeds +150°C, the current source turns off

automatically. The device will turn on again after

the IC’s

Enable Input

Over Temperature Protection

cools down under +120°C. Operating

at absolute m aximum temperature i s n ot

recommended.

LED connection

The PAM2811 supports up to 4 white LEDs. The

four LEDs are connected from VIN to LEDx

respectively. If the LED is not used, it should be

connected to GND or open.

Data

Current(mA)

Data

Current(mA)

18.75

8.75

17.5

7.5

16.25

6.25

13.75

3.75

12.5

2.5

11.25

1.25

PAM2811

4-Channel Single-Wire Dimming LED Drive with

Ultra Low Dropout Current Sink

03/2010 Rev1.0

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