A8436EEJTR-T Allegro Microsystems Inc, A8436EEJTR-T Datasheet - Page 10

• Manufacturer Part Number: A8436EEJTR-T
• Description: IC PHOTOFLASH CHARGER 10-MLP
• Manufacturer: Allegro Microsystems Inc

Specifications of A8436EEJTR-T

• Applications: Photoflash Capacitor Charger
• Current - Supply: 1.3mA
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 10-WFDFN Exposed Pad
• Input Voltage: 5.5V
• No. Of Outputs: 1
• Supply Voltage Range: 3V To 5.5V
• No. Of Pins: 10
• Operating Temperature Range: -40°C To +85°C
• Termination Type: SMD
• Filter Terminals: SMD
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1098-2

A8436
Figure 4A. Initial two cyles of charging
a completely discharged photoflash
capacitor. In these two cycles, off-time
(V
18 μs timer (Timer mode). Note that, in the
first cycle, I
the second cycle, it starts at a higher level.
This indicates that the transformer core did
not reset during the first cycle.
Figure 4B. During the intermediate cycles,
the output voltage, V
I
the ringing of V
ringing is not great enough, however,
to pull V
remains in Timer mode.
Figure 4C. The final cycle of Timer mode
is shown, followed by a series of cycles in
Fast Charging mode. V
down below 1.2 V in every cycle as a result
of increased V
the main MOSFET switch.
Secondary
SW
low) is controlled by the internal
SW
goes discontinuous, leading to
Primary
below 1.2 V, so the A8436
OUT
SW
starts near 0 A, but in
. The amplitude of the
, triggering the turn-on of
Conditions
Charging Cycles for a Completely Discharged Photoflash Capacitor
OUT
Symbol
SW
C1
C2
C3
C4
, has increased.
t
is able to ring
Parameter Units/Division
Parameter
I
V
V
Primary
V
V
time
BATT
BATT
OUT
SW
Photoflash Capacitor Charger with IGBT Driver
500 mA
Value
50 V
10 V
5 μs
5 V
V
IN
C3
C4
C3
C4
C3
C4
C2
C1
C2
C1
C2
C1
I
I
V
V
Primary
V
Primary
V
V
V
BATT
BATT
OUT
OUT
SW
SW
I
V
Primary
V
V
BATT
OUT
SW
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
t
t
t
10