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A8837EEJTR-T Datasheet(PDF) 4 Page - Allegro MicroSystems |
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A8837EEJTR-T Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 11 page Photoflash Capacitor Charger with IGBT Driver A8837 4 Allegro MicroSystems, Inc. 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com ELECTRICAL CHARACTERISTICS TA = 25°C and VIN = 3.3 V (unless otherwise noted) Characteristics Symbol Test Conditions Min. Typ. Max. Units Supply Voltage* VIN 3 – 5.5 V Supply Current IIN Charging – 1.5 – mA Charging done – 1 10 μA Shutdown (VCHARGE= 0 V, VTRIGGER= 0 V) – 0.01 1 μA Primary Side Current Limit (ILIM clock input at CHARGE pin) ISWLIM1 1.8 2.0 2.2 A ISWLIM2 – 1.8 – A ISWLIM3 – 1.6 – A ISWLIM4 – 1.4 – A ISWLIM5 – 1.2 – A ISWLIM6 –1– A ISWLIM7 – 0.86 – A ISWLIM8 – 0.7 – A SW On Resistance RDS(On)SW VIN = 3.3 V, ID = 800 mA – 0.27 – Ω SW Leakage Current* ISWLKG VSW = 35 V – – 1 μA SW Maximum Off-Time tOFF(Max) –18– μs SW Maximum On-Time tON(Max) –18– μs CHARGE Input Current ICHARGE VCHARGE = VIN ––1 μA CHARGE Input Voltage* VCHARGE(H) 2–– V VCHARGE(L) – – 0.8 V ILIM Clock High Time at CHARGE Pin tILIM1(H) Initial pulse 20 – – μs tILIM(H) Subsequent pulses 0.2 – – μs ILIM Clock Low Time at CHARGE Pin tILIM(L) 0.2 – – μs Total ILIM Setup Time tILIM(SU) –54– μs ¯D¯¯O¯¯N¯¯E¯ Output Leakage Current* IDONELKG ––1 μA ¯D¯¯O¯¯N¯¯E¯ Output Low Voltage* VDONE(L) 32 μA into ¯D¯¯O¯¯N¯¯E¯ pin – – 100 mV FB Voltage Threshold* VFB 1.187 1.205 1.223 V FB Input Current IFB VFB = 1.205 V – –120 – nA UVLO Enable Threshold VUVLO VIN rising 2.55 2.65 2.75 V UVLO Hysteresis VUVLOHYS – 150 – mV IGBT Driver IGBTDRV On Resistance to VIN RDS(On)I-V VIN = 3.3 V, VIGBTDRV= 1.5 V, VTRIGGER = VIN –5– Ω IGBTDRV On Resistance to GND RDS(On)I-G VIN = 3.3 V, VIGBTDRV= 1.5 V, VTRIGGER = 0 V – 6 – Ω TRIGGER Input Current ITRIGGER VTRIGGER = VIN ––1 μA TRIGGER Input Voltage* VTRIGGER(H) 2–– V VTRIGGER(L) – – 0.8 V Propagation Delay, Rising tDr Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V – 30 – ns Propagation Delay, Falling tDf Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V – 30 – ns Output Rise Time tr Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V – 70 – ns Output Fall Time tf Rgate=12 Ω, CLOAD = 6500 pF, VIN = 3.3 V – 70 – ns Minimum dV/dt for ZVS Comparator dV/dt Measured at SW pin – 30 – V/μs *Guaranteed by design and characterization over operating temperature range, –40°C to 85°C. |
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