AT1454B 데이터 시트보기 (PDF) - Unspecified

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AT1454B

Preliminary Product Information Photoflash Capacitor Charger for DSC

Unspecified 

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:

I PK −PRI

= VBAT × 2 ×10−6

VRsense × LPRI

,VRsense

= VBAT (or,VCC ) ×

25KΩ

R4 + 25KΩ

TON

=

I PK −PRI × LPRI

VBAT

where

LPRI: primary inductance (µH)

IPK-PRI: peak primary current (A)

R4: It is recommended several KΩ 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.

VBAT

L1 33uH

/Option

T1

ST-982610A

1:25

10uH/6.1mH

VCC

R10

C1

R4 22u/6V3

Css

0.1uF

VCC

Rsense

LX

AT1454/AT1454A/AT1454B

Isec

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

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