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ALT80800KLPATR Folha de dados(PDF) 13 Page - Allegro MicroSystems

Nome de Peças ALT80800KLPATR
Descrição Electrónicos  Automotive-Grade, Constant-Current 2.0 A PWM Dimmable Synchronous Buck LED Driver
PDF  23 Pages
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Fabricante Electrônico  ALLEGRO [Allegro MicroSystems]
Página de início  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

ALT80800KLPATR Folha de dados(HTML) 13 Page - Allegro MicroSystems

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Automotive-Grade, Constant-Current 2.0 A
PWM Dimmable Synchronous Buck LED Driver
ALT80800
13
Allegro MicroSystems, LLC
955 Perimeter Road
Manchester, NH 03103-3353 U.S.A.
www.allegromicro.com
Table 1: LED Open Fault Truth Table
FDSET
ADIM
FFnn
LED Open Fault Event?
PWM
FFnn+1
VCSREG < 25% × iLED Max Duty
High
High
x
No Open Fault
1
High
High
x
Yes, Open Fault
0
Low
x
1
x
x
1
x
Low
1
x
x
1
Low
x
0
Yes, Open Fault
x
0
x
Low
0
Yes, Open Fault
x
0
Low
x
0
No Open Fault
1
x
Low
0
No Open Fault
1
FDSET High means FDSET > REF1; FDSET Low means FDSET < REF1;
ADIM High means ADIM > 264 mV; ADIM Low means ADIM < 264 mV
When output Short fault (such as LED shorted to ground or out-
put capacitor shorted to ground) occurs, FFn will be flagged as
VOUT drops below 1.5 V and ADIM voltage is above 264 mV; but
regulator will not enter into Hiccup mode and will work continu-
ously. When short is removed, ALT80800 will return to normal
operation.
When an LED Open/Short fault occurs, the Fault pin will be 
flagged if the fault remains active after a deglitch period (tFDG).
A mask timer (tMASK) is also introduced whenever PWM signal
goes from Low to High. During this mask time, faults will not be
detected, so the fault will not be detected when the PWM pulse
width is less than this mask time. When PWM goes low, fault
flag is latched. Fault flag will keep prior state when PWM is
Low.



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