LED5000PHR STMicroelectronics, LED5000PHR Datasheet - Page 16
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LED5000PHR
Manufacturer Part Number
LED5000PHR
Description
Current & Power Monitors & Regulators 3A monolithic Conv 850kHz Synch
Manufacturer
STMicroelectronics
Datasheet
1.LED5000PHR.pdf
(51 pages)
Specifications of LED5000PHR
Rohs
yes
Product
Current Regulators
Supply Voltage - Max
48 V
Supply Voltage - Min
5.5 V
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
Package / Case
HPSO-8
Accuracy
+/- 3 %
Input Voltage Range
5.5 V to 48 V
Output Current
23 uA
Sensing Method
High or Low Side
Supply Current
1.7 mA
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LED5000PHR
Manufacturer:
ISSI
Quantity:
1 001
Application notes - buck conversion
5.4
16/51
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 current. This parameter is required to study the behavior of the
system in the small signal analysis.
For instance, the equivalent dynamic resistance of Luxeon III Star from Lumiled measured
with different biasing current levels is reported below:
In case the LED datasheet does not provide the equivalent resistor value, it can be easily
derived as the tangent to the diode I-V characteristic in the present working point (see
Figure 8
Figure 8.
Figure 9
The equivalent loading resistor in the LEDs working point is:
Equation 12
).
shows the equivalent circuit of the LED constant current generator.
Equivalent series resistor
0.1
[A]
1
r
Doc ID 023951 Rev 1
LED
R
LOAD
1
=
1.3
0.9
n
LED
working point
2
r
LED
I
I
LED
LED
+
3
=
=
R
SENSE
350mA
700mA
4
[V]
LED5000
AM13492v1