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LED5000 Datasheet(PDF) 28 Page - STMicroelectronics

Part # LED5000
Description  3 A monolithic step-down current source with dimming capability
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED5000 Datasheet(HTML) 28 Page - STMicroelectronics

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Application notes - buck conversion
LED5000
28/51
Doc ID 023951 Rev 1
higher than this value to compensate for the losses in the overall application. For this
reason, the conduction losses related to the RDSON increase compared to an ideal case.
●
Switching losses due to turning ON and OFF. These are derived using the following
equation:
Equation 38
Where TRISE and TFALL represent the switching times of the power element that cause the
switching losses when driving an inductive load (see
Figure 18). TSW is the equivalent
switching time.
Figure 18.
Switching losses
●
Quiescent current losses.
Equation 39
Example (see
Chapter 5.6):
VIN=42 V, VFW_LED=3.7 V, nLED=8, ILED=1500 mA
The typical output voltage is:
Equation 40
RDSON_HS has a typical value of 200 Ω at 25 °C.
P
SW
V
IN
I
OUT
T
RISE
T
FALL
+
()
2
-----------------------------------------
F
SW
V
IN
=
I
OUT
T
SW_EQ
F
SW
⋅⋅
⋅
⋅
⋅
⋅
=
AM13502v1
P
Q
V
IN
I
Q
⋅
=
V
OUT
n
LED
V
FW_LED
V
FB
+
⋅
29.4V
==



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