A8514 Ver la hoja de datos (PDF) - Allegro MicroSystems
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A8514 Datasheet PDF : 35 Pages
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A8514
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
ELECTRICAL CHARACTERISTICS1,2 Valid at VIN = 16 V, TA = 25°C, indicates specifications guaranteed by design and
characterization over the full operating temperature range with TA = TJ = –40°C to 125°C; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Input Voltage Specifications
Operating Input Voltage Range3
VIN
5
–
40
V
UVLO Start Threshold
VUVLOrise VIN rising
−
–
4.35
V
UVLO Stop Threshold
UVLO Hysteresis2
Input Currents
VUVLOfall
VUVLOHYS
VIN falling
−
–
3.90
V
300
450
600
mV
Input Quiescent Current
IQ
PWM/EN = VIH ; SW = 2 MHz, no load
−
5.5
10
mA
Input Sleep Supply Current
IQSLEEP
Input Logic Levels (PWM/EN and APWM)
VIN = 16 V, VPWMEN = VFSETSYNC = 0 V
−
2
10.0
μA
Input Logic Level-Low
VIL
VIN throughout operating input voltage range
–
–
400
mV
Input Logic Level-High
PWM/EN Pin Open Drain
Pull-down Resistor
VIH
VIN throughout operating input voltage range
RPWMEN PWM/EN = 5 V
1.5
–
–
V
60
100
140
kΩ
APWM Pull-down Resistor
APWM
RAPWM PWM/EN = VIH
60
100
140
kΩ
APWM Frequency2
Error Amplifier
fAPWM VIH = 2 V, VIL = 0 V
20
−
1000
kHz
Open Loop Voltage Gain
Transconductance
Source Current
Sink Current
COMP Pin Pull-down Resistance
Overvoltage Protection
AVOL
gm
IEA(SRC)
IEA(SINK)
RCOMP
ΔICOMP = ±10 μA
VCOMP = 1.5 V
VCOMP = 1.5 V
¯F¯ ¯A¯U¯¯L¯ ¯T¯ = 0
44
48
52
dB
750
990
1220
μA/V
−
–350
−
μA
−
350
−
μA
−
2000
−
Ω
Overvoltage Threshold
VOVP(th) OVP connected to VOUT
7.7
8.1
8.5
V
OVP Sense Current
IOVPH
188
199
210
μA
OVP Leakage Current
IOVPLKG ROVP = 40.2 kΩ, VIN = 16 V, PWM/EN = VIL
−
0.1
1
μA
Secondary Overvoltage Protection
Boost Switch
VOVP(sec)
53
55
58
V
Switch On-Resistance
RSW ISW = 0.750 A, VIN = 16 V
75
300
600
mΩ
Switch Leakage Current
ISWLKG VSW = 16 V, PWM/EN = VIL
−
0.1
1
μA
Switch Current Limit
Secondary Switch Current Limit2
ISW(LIM)
ISW(LIM2)
Higher than ISW(LIM)(max) for all conditions,
device latches when detected
3.0
3.5
4.2
A
−
7.00
−
A
Soft Start Boost Current Limit
Minimum Switch On-Time
ISWSS(LIM) Initial soft start current for boost switch
tSWONTIME
−
700
−
mA
60
85
111
ns
Minimum Switch Off-Time
tSWOFFTIME
30
47
68
ns
Continued on the next page…
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
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