A8507ELBTR-T Просмотр технического описания (PDF) - Allegro MicroSystems
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A8507ELBTR-T Datasheet PDF : 16 Pages
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A8507
LED Backlight Driver for LCD Monitors and Televisions
VEN
C3
VPWM
C2
VIN
C1
IOUT
C4
Typical Power Sequencing Waveforms
Turn-on sequence
VIN – VEN – VPWM
Turn-off sequence
VPWM – VEN – VIN
VIN
VEN
VIN
VEN
VPWM
C3
VPWM
IOUT
C2
IOUT
C1
C4
t
t
VEN
VPWM
VIN
IOUT
Turn-on sequence
VIN – VPWM – VEN
Turn-off sequence
VEN – VPWM – VIN
VEN
C3
VPWM
C2
VIN
C1
IOUT
C4
t
VIN
VEN
VIN
VEN
VPWM
C3
VPWM
IOUT
C2
IOUT
C1
C4
t
C1: VIN , 1 V / div.
C2: VPWM , 5 V / div.
C3: VEN , 5 V / div.
C4: IOUT , 200 mA / div.
Time: 2 ms / div.
Fig 12. Alternative Turn-On and Turn-Off sequences: (top) VEN –VPWM –VEN, (bottom) VVPWM –VEN –VPWM, with 6 parallel
strings with 9 series LEDs each, VBAT = 12 V, VPWM = 5 V (100% Current), VIN = 5 V, VEN = 5 V, ILED = 55 mA per channel
VEN
VPWM
VIN
IOUT
Allegro MicroSystems, Inc.
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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