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TB62731FUG Fiches technique(PDF) 11 Page - Marktech Corporate

No de pièce TB62731FUG
Description  Step-up DC-DC Converter for White LED Driver
Download  17 Pages
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Fabricant  MARKTECH [Marktech Corporate]
Site Internet  http://www.marktechopto.com
Logo MARKTECH - Marktech Corporate

TB62731FUG Fiches technique(HTML) 11 Page - Marktech Corporate

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TB62731FUG
2004-09-14
11
The self-generated temperature Tup (°C) is calculated as follows:
Tup (°C) = ((0.32 − (0.32 × 0.7)) − (0.5 × 0.1 + 0.3 × 0.02 + 1.8 × 0.02 × 0.02)) × 260 = 10.2 (°C)
Thus, the derating start temperature Ts (°C) is calculated as follows:
Ts (°C) = 45 (°C) − 10.4 (°C) = 34.8 (°C)
As a result, Io is controlled in the recommended current range as shown in Figure 5.
Since saturation thermal resistance θja = 260 (°C/W) is the maximum value, θja = 210~260 (°C/W) is used as a
mounting condition.
Depending on the IC characteristics, peripherals, and use environment, the derating start temperature
fluctuates among ICs.
Figure 5
Derating Function of Set Current
0
0
25
50
75
100
20
40
60
80
100
120
Change from Ts = 34.8°C (20 mA = 100%)
Change according to Tjs
Recommended LED current range (converted by 25 mA)
Temperatures Ts (°C) and Tjs (°C)


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