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參數(shù)資料
| 型號： | AT1454BM-GRE |
| 廠商： | Aimtron Technology Corp. |
| 英文描述： | Photoflash Capacitor Charger for DSC |
| 中文描述： | 照相閃光燈電容充電器的數(shù)碼相機 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 494K |
| 代理商： | AT1454BM-GRE |
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Adjustable Input Current
The AT1454/1454A/B can adjust N-MOS switch on-time by a resistor connecting to
Rsense pin. This resistor determines the primary peak current and on-time of primary
N-MOS as the following equation:
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2 Email:
service@aimtron.com.tw
15
BAT
PRI
PRI
V
PK
ON
CC
BAT
Rsense
PRI
Rsense
×
BAT
V
PRI
PK
L
I
T
K
R
K
25
V
or
V
V
L
V
I
=
+
×
=
×
×
×
=
25
)
,
(
,
10
2
4
6
where
L
PRI
: primary inductance (
μ
H)
I
PK-PRI
: peak primary current (A)
R4: It is recommended several K
Ω
grade
If setting constant on-time by a resistor R10 is connected to VCC, then R4 resistor
need to remove from application circuitry. In this case, on-time is a constant. At
another topology, if R4 connect to VBAT to set constant on-time, then R10 need to
remove from application circuitry. However, on-time can change dependent on VBAT
because battery voltage level is different from full energy to low power. External
capacitor Css is connected to VCC and Rsense to perform soft-start function to reduce
inrush current on VBAT input current and avoid the internal switching noise.
LX
VCC
VBAT
Rsense
L1 33uH
/Option
C1
22u/6V3
T1
ST-982610A
1:25
10uH/6.1mH
AT1454/AT1454A/AT1454B
VCC
Isec
R4
Css
0.1uF
R10
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