A8516 データシートの表示（PDF） - Allegro MicroSystems
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A8516 Datasheet PDF : 17 Pages
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A8516
LED Backlight Driver for LCD Monitors and Televisions
Normal Startup Power Sequences
VBAT = 12 V, Load = 6 strings, 16 LEDs each string, 56 mA per string, Output capacitors = 2 × 2.2 μF ceramic
The A8516 can startup with any combination of input and power sequences, as shown in waveforms below:
VOUT
C3,C4
ILED
VPWM
C2
VEN
C1
t
VOUT
C3,C4
C2
C1
ILED
VPWM
VEN
t
VOUT
C3,C4
C2
C1
ILED
VPWM
VEN
t
C3,C4
VOUT
ILED
C2 VPWM
C1 VEN
t
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VPWM
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Normal startup with EN = Low-to-
High transition (PWM = High)
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VPWM
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Normal startup with PWM = Low-to-
High transition (EN = High)
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VPWM
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Normal startup with PWM signal
toggling at 500 Hz, 50% duty cycle
Symbol
C1
C2
C3
C4
t
Parameter Units/Division
VEN
VPWM
VOUT
Total ILED
time
10 V
10 V
10 V
100 mA
2 ms
Normal startup with battery voltage
ramping up from 2 to 12 V (EN=
PWM = High)
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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