A8439 データシートの表示（PDF） - Allegro MicroSystems
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A8439 Datasheet PDF : 14 Pages
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A8439
Photoflash Capacitor Charger with IGBT Driver and Refresh
ELECTRICAL CHARACTERISTICS Typical values at TA = 25°C and VIN = 3.3 V (unless otherwise noted)
Characteristics
Symbol
Test Conditions
Supply Voltage*
VIN
Charging
Supply Current
Primary Side Current Limit
(ILIM clock input at CHARGE pin)
SW On Resistance
SW Leakage Current*
SW Maximum Off-Time
SW Maximum On-Time
CHARGE Input Current
CHARGE Input Voltage*
ILIM Clock High Time at
CHARGE Pin
ILIM Clock Low Time at
CHARGE Pin
IIN
ISWLIM1
ISWLIM2
ISWLIM3
ISWLIM4
ISWLIM5
ISWLIM6
ISWLIM7
ISWLIM8
RDS(On)SW
ISWLKG
tOFF(Max)
tON(Max)
ICHARGE
VCHARGE(H)
VCHARGE(L)
tILIM1(H)
tILIM(H)
tILIM(L)
Charging done / Refresh monitoring
Shutdown (VCHARGE = 0 V, VTRIGGER = 0 V)
VIN = 3.3 V, ID = 800 mA, TA = 25°C
VSW = 35 V
VCHARGE = VIN
Initial pulse
Subsequent pulses
Total ILIM Setup Time
¯D¯¯O¯¯N¯¯E¯ Output Leakage Current*
tILIM(SU)
IDONELKG
¯D¯¯O¯¯N¯¯E¯ Output Low Voltage*
FB Voltage Threshold*
FB Input Current
Auto-Refresh Threshold Level
UVLO Enable Threshold
UVLO Hysteresis
IGBT Driver
VDONE(L)
VFB
IFB
VFBR
VUVLO
VUVLOHYS
32 μA into ¯D¯¯O¯¯N¯¯E¯ pin
VFB = 1.205 V
VIN rising
IGBTDRV On Resistance to VIN
RDS(On)I-V
VIN = 3.3 V, VIGBTDRV = 1.5 V, VTRIGGER = VIN
IGBTDRV On Resistance to GND RDS(On)I-G VIN = 3.3 V, VIGBTDRV = 1.5 V, VTRIGGER = 0 V
TRIGGER Input Current
ITRIGGER
VTRIGGER = VIN
TRIGGER Input Voltage*
VTRIGGER(H)
VTRIGGER(L)
Propagation Delay, Rising
tDr
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Propagation Delay, Falling
tDf
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Output Rise Time
tr
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Output Fall Time
tf
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
*Guaranteed by design and characterization over operating temperature range, –40°C to 85°C.
Min. Typ. Max. Units
3 – 5.5 V
– 1.5 – mA
– 300 600 μA
– 0.01 1 μA
1.2 1.4 1.6 A
– 1.2 – A
– 1.0 – A
– 0.86 – A
– 0.7 – A
– 0.55 – A
– 0.4 – A
– 0.27 – A
– 0.27 – Ω
– – 1 μA
– 18 – μs
– 18 – μs
– – 1 μA
2––V
– – 0.8 V
20 – – μs
0.2 – – μs
0.2 – – μs
– 54 – μs
– – 1 μA
– – 100 mV
1.187 1.205 1.223 V
– –120 – nA
– 1.07 – V
2.55 2.65 2.75 V
– 150 – mV
– 5 –Ω
– 6 –Ω
– – 1 μA
2––V
– – 0.8 V
– 30 – ns
– 30 – ns
– 70 – ns
– 70 – ns
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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