LED2000DR STMicroelectronics, LED2000DR Datasheet - Page 27

• Manufacturer Part Number: LED2000DR
• Description: Current & Power Monitors & Regulators 3A monolithic Conv 850kHz Synch
• Manufacturer: STMicroelectronics

Specifications of LED2000DR

• Rohs: yes
• Product: Current Regulators
• Supply Voltage - Max: 14.7 V
• Supply Voltage - Min: 14.1 V
• Input Voltage Range: 14.1 V to 14.7 V

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
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