A8837 查看數據表（PDF） - Allegro MicroSystems
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A8837 Datasheet PDF : 11 Pages
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A8837
Photoflash Capacitor Charger with IGBT Driver
ELECTRICAL CHARACTERISTICS 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
Shutdown (VCHARGE = 0 V, VTRIGGER = 0 V)
VIN = 3.3 V, ID = 800 mA
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
UVLO Enable Threshold
UVLO Hysteresis
IGBT Driver
VDONE(L)
VFB
IFB
VUVLO
VUVLOHYS
32 μA into ¯D¯¯O¯¯N¯¯E¯ pin
VFB = 1.205 V
VIN rising
IGBTDRV On Resistance to VIN
IGBTDRV On Resistance to GND
TRIGGER Input Current
TRIGGER Input Voltage*
Propagation Delay, Rising
Propagation Delay, Falling
Output Rise Time
Output Fall Time
Minimum dV/dt for
ZVS Comparator
RDS(On)I-V
RDS(On)I-G
ITRIGGER
VTRIGGER(H)
VTRIGGER(L)
tDr
tDf
tr
tf
dV/dt
VIN = 3.3 V, VIGBTDRV = 1.5 V, VTRIGGER = VIN
VIN = 3.3 V, VIGBTDRV = 1.5 V, VTRIGGER = 0 V
VTRIGGER = VIN
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V
Measured at SW pin
*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
– 1 10 μA
– 0.01 1 μA
1.8 2.0 2.2 A
– 1.8 – A
– 1.6 – A
– 1.4 – A
– 1.2 – A
–1–A
– 0.86 – A
– 0.7 – 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
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
– 30 – V/μs
Allegro MicroSystems, Inc.
4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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