A8438(2005) 데이터 시트보기 (PDF) - Allegro MicroSystems
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A8438 Datasheet PDF : 13 Pages
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A8438 Photoflash Capacitor Charger with IGBT Driver
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
SW On Resistance
SW Leakage Current*
SW Maximum Off-Time
CHARGE Input Current
CHARGE Input Voltage*
IIN
ISWLIM
RDS(On)SW
ISWLKG
tOFF(Max)
ICHARGE
VCHARGE(H)
VCHARGE(L)
Charging done
Shutdown (VCHARGE = 0 V, VTRIGGER = 0 V)
VILIM = 0 V
ILIM pin floating
VILIM = VIN
VIN = 3.3 V, ID = 800 mA, TA = 25°C
VSW = 35 V
VCHARGE = VIN
¯D¯¯O¯¯N¯¯E¯ Output Leakage Current*
IDONELKG
¯D¯¯O¯¯N¯¯E¯ Output Low Voltage*
VDONE(L) 32 μA into ¯D¯¯O¯¯N¯¯E¯ pin
FB Voltage Threshold*
FB Input Current
UVLO Enable Threshold
UVLO Hysteresis
IGBT Driver
VFB
IFB
VUVLO
VUVLOHYS
VFB = 1.205 V
VIN rising
IGBTDRV On Resistance to VIN
RDS(On)I-V VIN = 3.3 V, VIGBTDRV = 1.5 V
IGBTDRV On Resistance to GND RDS(On)I-G VIN = 3.3 V, VIGBTDRV = 1.5 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
– 5 – mA
– 1 10 μA
– 0.01 1 μA
– 1.6 – A
1.6 1.8 2.0 A
– 2.0 – A
– 0.27 – Ω
– 0.2 1 μA
– 18 – μs
– – 1 μA
2––V
– – 0.8 V
– – 1 μA
– – 100 mV
1.187 1.205 1.223 V
– –120 – nA
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
A8438-DS, Rev. 1
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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