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參數(shù)資料
| 型號： | A8439 |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | Photoflash Capacitor Charger with IGBT Driver and Refresh |
| 中文描述： | 照相閃光燈電容充電器與IGBT驅(qū)動器和刷新 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 537K |
| 代理商： | A8439 |
A8439-DS, Rev. 1
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
115 Northeast Cutoff, Box 15036
Allegro MicroSystems, Inc.
Photoflash Capacitor Charger with IGBT Driver
A8439
8
Figure 5 shows the timing definition of the primary current
limiting circuit. At the end of the setup period, t
ILIM(SU)
, primary
current starts to ramp up to the set I
SWIM
. The I
SWLIM
setting
remains in effect as long as the CHARGE pin is high. To reset the
ILIM counter, pull the CHARGE pin low before clocking in the
new setting.
After the first start-up or an ILIM counter reset, each new current
limit can be set by sending a burst of pulses to the CHARGE pin.
The first rising edge starts the ILIM counter, and up to 8 rising
edges will be counted to set the I
SWLIM
level. The CHARGE pin
will stay HIGH afterwards. The user has a maximum of 32
μ
s
to clock in the input pulses. The four panels of figure 6 show
examples of the pulse streams and the resulting current levels.
t
ILIM(H)
t
ILIM(L)
t
ILIMSU
Clock input at
CHARGE pin
Figure 4. ILIM Clock Timing Definition
Charging
Action
Primary
Current
CHARGE
Shutdown
Reset ILIM Counter
Start ILIM Counter
t
OFF
I
LIM
tILIM(SU)
Figure 5. Current Limiting Waveforms. Example shows setting at I
SWLIM4
.
Figure 6. ILIM programming waveforms for ILIM = 1.4 A, 1.2 A, 1.0 A, and
0.86 A.
(A) 1.4 A
(B) 1.2 A
(C) 1.0 A
(D) 0.86 A
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