TB62731FU Ver la hoja de datos (PDF) - Marktech Optoelectronics
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TB62731FU Datasheet PDF : 9 Pages
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TOSHIBA
TB62731FU
[Driving Current Derating Function]
In order to avoid application problems, it is important to stay within the LED Lamps maximum ratings.
This is especially critical when determining the maximum allowable driving current, which needs to be
derated depending on atmospheric temperature. The TB62731FU has a built-in current derating
function that helps light LED lamps safely and efficiently.
TB62731FU’s driving current derating function is designed to start working at 45°C in Tj as shown in
Figure 1. When the driving current is 20mA, derating is expected to start approximately at 25°C in Ta.
The difference between Tj and Ta depends on LED driving current, IC mounting conditions, PCB
patterns, cooling conditions. The initial driving current level must be set carefully so as not to exceed the
absolute maximum ratings of LEDs.
With Toshiba’s original derating function the TB62731FU can supply a higher LED driving current thus
eliminating current limitations in high temperatures. Competitive ICs do not have this function, therefore
this feature will contribute to a reduction in the amount of LED lamps used.
FIGURE 1
25
Current Derating Function
20
15
10
5
0
0
20
40
60
80
Temperature Tj / Ta (°C)
Solid line; Tj operation, Dotted line; Ta operation
Available from:
Marktech Optoelectronics
120 Broadway • Menands, NY 12203
800.984.5337 FAX: 518.432.7454
Website: www.marktechopto.com
Email: info@marktechopto.com
The information contained herein is subject to change without notice.
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