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PAM2800 Datasheet(PDF) 5 Page - Power Analog Micoelectronics

Part # PAM2800
Description  High Power White LED Driver
Download  7 Pages
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Manufacturer  PAM [Power Analog Micoelectronics]
Direct Link  http://www.poweranalog.com
Logo PAM - Power Analog Micoelectronics

PAM2800 Datasheet(HTML) 5 Page - Power Analog Micoelectronics

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Application Information
5
In the typical application (see Figure 1), the LED
current will come to constant current level little by
little after the device is powered. A 62ΚΩ resistor
is recommended for R1,
the value for R2
should be adjusted around 33ΚΩ due to LED
forward voltage
from lot-to-lot or brand-
to-brand.
P
= (T
-T )/θ
θ
θ
variation
Thermal protection limits power dissipation in the
PAM2800.
When
the
operation
j unction
temperature exceeds 150°C, the OTP (Over
Te mperature P rotection) starts the t hermal
shutdown and turns the pass transistor off. The
pass transistor resumes operation after the
junction temperature drops below 120°C.
For
c ontinuous
operation,
the
j unction
temperature should be maintained below 125°C.
The power dissipation is defined as:
P = (V -V
)*I +V *I
The maximum power dissipation depends on the
thermal resistance of IC package, PCB layout, the
rate of surrounding airflow and temperature
difference between junction and ambient. The
maximum power dissipation can be calculated by
the following formula:
Where T
is the maximum operation junction
temperature 125°C.T
i s t he ambient
temperature, and
is the thermal resistance
from the junction to the ambient.
For example, as
is 250°C/W for SOT-23,
based on the standard JEDEC 51-3 for a single-
layer thermal test board, the maximum power
dissipation
at T =25°C can
be calculated by following formula:
P
= (125°C-25°C)/250=0.4W
To calculate the junction temperature of the
PAM2800 SOT-23 package, if we use input
voltage V =4V at an output current I =300mA
and the case temperature T =40°C measured by
the thermal couple while operating, the power
dissipation is defined as:
P =(4V-2.8V)*300mA+4V*70μA
360mW
Power Dissipation and Thermal Consideration
D
IN
OUT
O
IN
GND
J(MAX)
A
JA
A
D(MAX)
IN
O
A
D
D(MAX)
J(MAX)
A
JA
JA
and
for SOT-23 package
PAM2800
High Power White LED Driver
09/2008 Rev 1.1
,
Power Analog Microelectronics Inc
www.poweranalog.com


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