A8515 Ver la hoja de datos (PDF) - Allegro MicroSystems
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A8515 Datasheet PDF : 34 Pages
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A8515
Wide Input Voltage Range, High Efficiency
Fault Tolerant LED Driver
ELECTRICAL CHARACTERISTICS1 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 105°C; unless otherwise noted
Characteristics
Symbol
Test Conditions
Min.
Typ.2
Max.
Input Voltage Specifications
Operating Input Voltage Range3
VIN
5
–
40
UVLO Start Threshold
VUVLOrise VIN rising
−
–
4.35
UVLO Stop Threshold
UVLO Hysteresis4
Input Currents
VUVLOfall
VUVLOHYS
VIN falling
−
–
3.90
–
450
–
Input Quiescent Current
Input Sleep Supply Current
Input Logic Levels (EN/PWM, APWM)
IQ
IQSLEEP
EN/PWM = VIH ; SW = 2 MHz, no load
VIN = 16 V, EN/PWM = SYNC = 0 V
−
5.5
−
−
2
10.0
Input Logic Level-Low
Input Logic Level-High
EN/PWM Pin Open Drain
Pull-down Resistor
VIL
VIN throughout operating input voltage range
VIH
VIN throughout operating input voltage range
RENPWM
–
–
400
1.5
–
–
–
100
–
APWM Pull-down Resistor
APWM
RAPWM EN/PWM = VIH
–
100
–
APWM Frequency
Error Amplifier
fAPWM APWM, VIH = 1.5 V, VIL = 0.4 V
20
−
1000
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¯ = 1
−
48
−
−
990
−
−
–350
−
−
350
−
−
2000
−
Overvoltage Threshold
OVP Sense Current
OVP Leakage Current
Secondary Overvoltage Protection
Boost Switch
VOVP(th)
IOVPH
IOVPLKG
VOVP(sec)
OVP connected to VOUT
ROVP = 40.2 kΩ, VIN = 16 V, EN/PWM = VIL
7.7
8.1
8.5
188
199
210
−
0.1
1
−
55
−
Switch On-Resistance
Switch Leakage Current
Switch Current Limit
Secondary Switch Current Limit4
RSW
ISWLKG
ISW(LIM)
ISW(LIM2)
ISW = 0.750 A, VIN = 16 V
VSW = 16 V, EN/PWM = VIL
Higher than ISW(LIM)(max) for all conditions,
device latches when detected
−
300
−
−
0.1
1
3.0
3.5
4.2
−
7
−
Soft Start Boost Current Limit
Minimum Switch On-Time
Minimum Switch Off-Time
ISWSS(LIM) Initial soft start current for boost switch
tSWONTIME
tSWOFFTIME
−
700
−
−
85
−
−
47
−
Unit
V
V
V
mV
mA
μA
mV
V
kΩ
kΩ
kHz
dB
μA/V
μA
μA
Ω
V
μA
μA
V
mΩ
μA
A
A
mA
ns
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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