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A8436

Photoflash Capacitor Charger with IGBT Driver

Allegro MicroSystems 

A8436

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

SW Maximum On-Time

CHARGE Input Current

CHARGE Input Voltage*

IIN

ISWLIM

RDS(On)SW

ISWLKG

tOFF(Max)

tON(Max)

ICHARGE

VCHARGE(H)

VCHARGE(L)

Charging done

Shutdown (VCHARGE = 0 V, VTRIGGER = 0 V)

VILIM < 1.0 V

ILIM pin floating

VILIM > VIN – 1.3 V

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

– 1.0 – A

1.08 1.2 1.32 A

– 1.4 – A

– 0.27 – Ω

– – 1 μA

– 18 – μs

– 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

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

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