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Datasheet AT1453 PDF ( 特性, スペック, ピン接続図 )

部品番号 AT1453
部品説明 Photoflash Capacitor Charger
メーカ Aimtron Technology
ロゴ Aimtron Technology ロゴ 
プレビュー
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AT1453 Datasheet, AT1453 PDF,ピン配置, 機能
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AT1453
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Features
• 2.5 to 5.5V supply voltage operating range.
• Low current consumption: 1mA in operation,
• 50 kHz or 100kHz operation frequency .
• Built-in maximum duty control.
• Push-pull output.
• Built-in soft start circuit.
• Built-in auto-discharge function.
Applications
•Digital Still Cameras flash unit
General Description
The AT1453 is a charger control IC for Photoflash
capacitor with soft start function, adjustable
maximum duty cycle and auto-discharge (soft start
capacitor) circuit. Adjustable soft start is
programmed with an external capacitor on SS pin.
The control technique allows for the use of
external resistor to change the switching duty and
use of transformer to control the input current. A
logic high on the CHARGE pin initiates charging,
while the READY pin signals that the capacitor is
fully charged. It is ideal for DSC flash unit.
* Protected by U.S. Patent #6,724,989
Block Diagram
VCC
READY
GND
CHARGE
Reference
Vref
1.1V
Output
Control
Block
Enable
Block
OUT
SS
DUTY
FB
Aimtron reserves the right without notice to change this circuitry and specifications.
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
1

1 Page



AT1453 pdf, ピン配列
AT1453
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Absolute Maximum Ratings
Parameter
Condition
Rated Value
Unit
Min. Max.
Power Supply Voltage
Source Average Current of OUT
Sink Average Current of OUT
Input Voltage to Error Amplifier
Continuous power dissipation
Operating temperature
Junction temperature
Storage temperature
Lead temperature
TSSOP8Ta=+25℃)
SOP8Ta=+25℃)
- +6.5
- -50
- 50
- 6.5
- 450
- 500
-30 +85
- +125
-40 +150
- +300
V
mA
mA
V
mW
mW
0C
0C
0C
0C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may affect device reliability.
Recommended Operating Conditions
Parameter
Symbol
Power supply voltage
Operating temperature
VCC
TOP
Min.
2.5
-30
Values
Typ. Max.
-- 5.5
+25 +85
(Ta=+250C)
Unit
°C
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
3


3Pages


AT1453 電子部品, 半導体
AT1453
Preliminary Product Information
Photoflash Capacitor Charger for DSC
DUTY Setting
The DUTY resistor selection depends on Duty Cycle , choose the component using the following
equation:
V DUTY
(V )
=
0.3
+
DUTY
1.15
RDUTY
(K)
=
15
( 1.1
VDUTY
)
1.073
Example:
Set duty cycle is 50%
V DUTY
=
0.3
+
0.5
1.15
= 0.734
R DUTY
=
(
15
1.1
0.734
)
1.073
35.2K
Output Voltage Setting
VOUT
=
R1 + R2
R2
×
VFB
VFB = 1.1V
2F, No.10, Prosperity RD. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
WWW: http://www.aimtron.com.tw
Fax: 886-3-563-0879
Email: service@aimtron.com.tw
6

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