a8438eej-t Allegro MicroSystems, Inc., a8438eej-t Datasheet - Page 4

• Manufacturer Part Number: a8438eej-t
• Description: A8438 Photoflash Capacitor Charger With Igbt Driver
• Manufacturer: Allegro MicroSystems, Inc.

A8438
ELECTRICAL CHARACTERISTICS
Supply Voltage*
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*
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ Output Leakage Current*
¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ Output Low Voltage*
FB Voltage Threshold*
FB Input Current
UVLO Enable Threshold
UVLO Hysteresis
IGBT Driver
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
*Guaranteed by design and characterization over operating temperature range, –40°C to 85°C.
Characteristics
V
V
V
V
R
V
R
R
I
TRIGGER(H)
t
V
I
TRIGGER(L)
CHARGE(H)
I
CHARGE(L)
DONELKG
Symbol
t
OFF(Max)
TRIGGER
Typical values at T
DS(On)SW
I
CHARGE
UVLOHYS
DS(On)I-G
I
ON(Max)
V
DS(On)I-V
SWLKG
DONE(L)
SWLIM
V
V
UVLO
I
I
t
t
FB
IN
Dr
Df
t
t
FB
IN
r
f
Photoflash Capacitor Charger with IGBT Driver
Charging
Charging done
Shutdown (V
V
ILIM pin floating
V
V
V
V
32 μA into ¯ D ¯ ¯ O ¯ ¯ N ¯ ¯ E ¯ pin
V
V
V
V
V
R
R
R
R
ILIM
ILIM
IN
SW
CHARGE
FB
IN
IN
IN
TRIGGER
gate
gate
gate
gate
= 3.3 V, I
rising
= 3.3 V, V
= 3.3 V, V
= 1.205 V
= 35 V
=12 Ω, C
=12 Ω, C
=12 Ω, C
=12 Ω, C
< 1.0 V
> V
A
= 25°C and V
IN
= V
= V
– 1.3 V
D
IN
CHARGE
IN
IGBTDRV
IGBTDRV
LOAD
LOAD
LOAD
LOAD
= 800 mA, T
= 6500 pF, V
= 6500 pF, V
= 6500 pF, V
= 6500 pF, V
Test Conditions
= 0 V, V
IN
= 1.5 V
= 1.5 V
= 3.3 V (unless otherwise noted)
A
TRIGGER
= 25°C
IN
IN
IN
IN
= 3.3 V
= 3.3 V
= 3.3 V
= 3.3 V
= 0 V)
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com
1.187 1.205 1.223
2.55
Min.
1.6
3
–
–
–
–
–
–
–
–
–
–
2
–
–
–
–
–
–
–
–
2
–
–
–
–
–
–120
0.01
0.27
2.65
Typ.
150
1.6
1.8
2.0
0.2
18
18
30
30
70
70
–
5
1
–
–
–
–
–
5
6
–
–
–
Max. Units
2.75
100
5.5
2.0
0.8
0.8
10
–
1
–
–
–
1
–
–
1
–
1
–
–
–
–
1
–
–
–
–
–
mV
mV
mA
μA
μA
μA
μs
μs
μA
μA
nA
μA
ns
ns
ns
ns
V
Ω
V
V
V
V
Ω
Ω
V
V
A
A
A
4