參數(shù)資料
型號(hào)： A8436EEJTR-T
廠商： Allegro MicroSystems, Inc.
英文描述： Photoflash Capacitor Charger with IGBT Driver
中文描述： 照相閃光燈電容充電器采用IGBT驅(qū)動(dòng)器
文件頁數(shù)： 8/12頁
文件大?。?/td> 652K
代理商： A8436EEJTR-T
A8436-DS, Rev. 2
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Photoflash Capacitor Charger with IGBT Driver
A8436
8
Figure 4A. Initial two cyles of charging
a completely discharged photoflash
capacitor. In these two cycles, off-time
(V
SW
low) is controlled by the internal
18
μ
s timer (Timer mode). Note that, in the
first cycle, I
Primary
starts near 0 A, but in
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
OUT
, has increased.
I
Secondary
goes discontinuous, leading to
the ringing of V
SW
. The amplitude of the
ringing is not great enough, however,
to pull V
SW
below 1.2 V, so the A8436
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
SW
is able to ring
down below 1.2 V in every cycle as a result
of increased V
OUT
, triggering the turn-on of
the main MOSFET switch.
Charging Cycles for a Completely Discharged Photoflash Capacitor
Symbol
C1
C2
C3
C4
t
Conditions
Parameter
V
OUT
V
SW
V
BATT
I
Primary
time
Parameter
V
BATT
Units/Division
50 V
10 V
5 V
500 mA
5
μ
s
Value
V
IN
t
V
BATT
V
OUT
C4
C1
C3
C2
V
SW
I
Primary
t
V
BATT
V
OUT
C4
C1
C3
C2
V
SW
I
Primary
t
V
BATT
V
OUT
C1
C3
C2
V
SW
I
Primary
C4
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