AL5802-7 Diodes Inc., AL5802-7 Datasheet - Page 9

• Manufacturer Part Number: AL5802-7
• Description: LED Lighting Drivers Discrete LED Driver Driver,SOT26,3K
• Manufacturer: Diodes Inc.

Specifications of AL5802-7

• Product Category: LED Lighting Drivers
• Rohs: yes
• Input Voltage: 4.5 V to 30 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-26
• Minimum Operating Temperature: - 40 C
• Power Dissipation: 1 W

AL5802
Document number: DS35516 Rev. 6 - 2
Fig. 19 Application circuit for LED driver with
Fig. 18 Application circuit for LED driver
assured operation regardless of polarity
V
S
V
with reverse polarity protection
S
SDM10U45LP
AL5802
AL5802
BAS40BRW
R
S
R
S
www.diodes.com
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To remove the potential of incorrect connection of the power supply
damaging the lamp’s LEDs, many systems use some form of
reverse polarity protection.
One solution for reverse input polarity protection is to simply use a
diode with a low V
V
less power. A circuit example is presented in Fig. 18 using Diodes
Inc. SBR® (Super Barrier Rectifier) technology. An SDM10U45LP
(0.1A/45V) is shown, providing exceptionally low V
size of 1mm x 0.6mm, equivalent to an 0402 chip style package.
Other reverse voltage ratings are also available in Diodes’ website
such as the SBR02U100LP (0.2A/100V) or SBR0220LP (0.2A/20V).
Automotive applications commonly use this method for reverse
battery protection.
A second approach, shown in Fig. 19, improves upon the method
shown in Fig. 18. Whereas the method in Fig. 18 protects the light
engine, it will not function until the problem has been diagnosed and
corrected.
The method shown in Fig. 19 not only provides reverse polarity
protection, it also corrects the reversed polarity, allowing the light
engine to function.
The BAS40BRW incorporates four low V
single package and allows more voltage available for the LED stack
and dissipates less power that standard rectifier bridges.
F
increases the available voltage to the LED stack and dissipates
F
in-line with the driver/LED combination. The low
F
, Schottky diodes into a
© Diodes Incorporated
F
December 2012
for its package
AL5802