LED2000PUR STMicroelectronics, LED2000PUR Datasheet - Page 27
LED2000PUR
Manufacturer Part Number
LED2000PUR
Description
LED Lighting Drivers 3.0V to 18V 850kHz 100mV 95mOhm HS
Manufacturer
STMicroelectronics
Datasheet
1.LED2000DR.pdf
(40 pages)
Specifications of LED2000PUR
Rohs
yes
Input Voltage
3 V to 18 V
Operating Frequency
850 kHz
Maximum Supply Current
3 A
Mounting Style
SMD/SMT
Package / Case
VFQFPN-8L
Power Dissipation
2 W
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LED2000
7.3
Thermal considerations
The dissipated power of the device is tied to three different sources:
●
Equation 33
where D is the duty cycle of the application. Note that the duty cycle is theoretically given by
the ratio between V
higher than this value to compensate for the losses in the overall application. For this
reason, the conduction losses related to the R
●
Equation 34
where T
switching losses when driving an inductive load (see
switching time.
Figure 17. Switching losses
●
Equation 35
Example (see
P
P
P
OFF
Q
ON
P
Conduction losses due to the R
Switching losses due to turn-ON and turn-OFF. These are derived using the following
equation:
Quiescent current losses.
SW
=
=
V
=
RISE
=
IN
R
R
RDSON_HS
V
RDSON_LS
IN
I
and T
Q
Section Example
I
OUT
FALL
OUT
I
-------------------------------------------
OUT
I
T
OUT
represent the switching times of the power element that cause the
(n
RISE
LED
2
2
+
2
T
Doc ID 023432 Rev 3
D
FALL
V
1 D
1):
LED
–
DSON
+ 100 mV) and V
F
SW
, which are equal to:
=
V
IN
DSON
I
OUT
increase compared to an ideal case.
Figure
IN
T
, but in practice it is substantially
SW_EQ
17). T
F
SW
SW
Application information
is the equivalent
AM12908v1
27/40