EVALED2000P STMicroelectronics, EVALED2000P Datasheet - Page 15

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EVALED2000P

Manufacturer Part Number
EVALED2000P
Description
LED Lighting Development Tools LED2000 3A 850KHz 3.0V to 18V Eval BRD
Manufacturer
STMicroelectronics
Datasheet

Specifications of EVALED2000P

Product Category
LED Lighting Development Tools
Rohs
yes
Product
Evaluation Boards
Operating Supply Voltage
3 V to 18 V
For Use With
LED2000
LED2000
6.4
The embedded compensation network is R
considered as negligible. The error amplifier output resistance is 240 M
singularities are:
Equation 12
LED small signal model
Once the system reaches the working condition, the LEDs composing the row are biased
and their equivalent circuit can be considered as a resistor for frequencies << 1 MHz.
The LED manufacturer typically provides the equivalent dynamic resistance of the LED
biased at different DC currents. This parameter is required to study the behavior of the
system in the small signal analysis.
For instance, the equivalent dynamic resistance of the Luxeon III Star from Lumiled
measured with different biasing current level is reported below:
Equation 13
If the LED datasheet does not report the equivalent resistor value, it can be simply derived
as the tangent to the diode I-V characteristic in the present working point (see
f
Z
=
r
LED
11 6 kHz
1.3
0.9
f
P LF
I
I
LED
LED
=
3 4 Hz
=
=
350mA
700mA
Doc ID 023432 Rev 3
C
=70 K, C
C
=195 pF while C
P
Application notes
and C
so the relevant
Figure
O
can be
7).
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