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AN4501 Datasheet(PDF) 8 Page - STMicroelectronics

Part # AN4501
Description  Design of a boost LED driver using L99LD01
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4501 Datasheet(HTML) 8 Page - STMicroelectronics

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Guideline for the selection of external components
AN4501
8/48
DocID026394 Rev 1
Figure 2. Application schematics
Step 1: Calculation of the duty cycle
The minimum duty cycle is compatible with the device specification (datasheet parameter:
TON_MIN, 14% maximum specification see Appendix C: Document management) of the
converter is respected.
VOUT,OVTH
42 V
Output over-voltage threshold
rMAX
0.5
Max. ratio at VIN,MIN between inductor current ripple
(IL,PP@VINMIN,TARGET) and inductor average current (IL)
FSW
450 kHz
Switching frequency
IOUT,PP,MAX,TARGET
75 mA
Target maximum output current ripple
RDLED
0.4
Ω
Dynamic resistance of one LEDs
NbLED
8
Number of LEDs in series
VIN,PP,MAX,TARGET
100 mV
Target maximum peak-to-peak input voltage ripple
RTHAMB,M1
25 K/W
Thermal resistance of the switching resistor M1
TAMB,MAX
85 °C
Max. ambient temperature
RDSON,25
16 m
Ω
M1 RDSON at 25°C
h
90 %
Estimated converter’s efficiency
Table 1. Example of application conditions and requirements (continued)
Parameter
Value
Comments
D
MI N
1
V
IN MAX
η
×
V
OU T
-------------------------------
1
18
0.9
×
26
---------------------
37.7%
==
=


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