A8502 データシートの表示（PDF） - Allegro MicroSystems
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A8502 Datasheet PDF : 35 Pages
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A8502
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
Functional Block Diagram
VIN
FSET/SYNC
COMP
VSENSE
GATE
PWM/EN
APWM
ISET
VDD
Regulator
UVLO
Internal VCC
Oscillator
Internal VCC
1.235 V
Ref
VREF
AGND
∑
+
–
SW
Fault
Driver
Circuit
Diode
Open
+ Sense
–
Internal
Soft Start ISS
+
–
Input Current
Sense Amplifier
IADJ
Current
Sense
Fault
PMOS
Driver
GOFF
Enable
100 kΩ
PWM
VREF
Internal VCC
ISET
Fault
ISS
LED
Driver
PGND
Thermal
Shutdown
OVP
Sense
VREF
Open/Short
LED Detect
AGND
Fault
OVP
LED1
LED2
FAULT
PAD
PGND
AGND
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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