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AT1454/AT1454A/AT1454B
Preliminary Product Information Photoflash Capacitor Charger for DSC Feature • 2.5V to 5.5V Supply Voltage Operating • • • • • • • • • • •
Range. Low Current Consumption:1mA in operation. Adjustable Output Voltage. Adjustable Switch On-Time. Charge Complete Indicator. Built-in IGBT Driver. Soft-Start Circuitry. Thermal Protection Charges Any Size Photoflash Capacitor. AT1454 with Auto-Refresh Function. AT1454A/B without Auto-Refresh Function. Small 10-lead MSOP Package.
Description
The AT1454 series is a charger IC for Photoflash capacitor with soft-start function, an IGBT driver for igniting flash tube, adjustable output voltage and adjustable switch on-time to perform energy transition on each charge cycle. The output voltage can be adjusted by simply changing the turn ratio of transformer. AT1454B is sensed by voltage divider connecting to the anode of the rectifying diode. The voltage sensing path is cut off when charging function to be completed to maintain minimum output voltage decay. The device allows user to control automatic refresh rate on Charge pin. While the Ready pin signals that the capacitor is fully charged. AT1454/AT1454A/AT1454B MSOP-10 package. is available in
Application • Digital / Film Camera Flash • PDA / Cell Phone Flash.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
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:
[email protected] 1
AT1454/AT1454A/AT1454B
Preliminary Product Information Photoflash Capacitor Charger for DSC Pin Configuration
1 0
9
8
7
6
1454
1 2 3 4 5
Ordering Information
Part number AT1454M_GRE AT1454AM_GRE AT1454BM_GRE Package MSOP-10 , Green MSOP-10 , Green MSOP-10 , Green Marking AT1454, Date code with one bottom line AT1454A, Date code with one bottom line AT1454B, Date code with one bottom line
*For more marking information, contact our sales representative directly
Pin Description
Pin N0. Symbol 1 CHARGE 2 FB 3 TRIGGER 4 5 6 7 8 9 10 ISEC GND LX DRIVER VCC READY Rsense I/O I I I I P I O P O I Description Charge enable input Comparator input IGBT Trigger signal input. Detecting transformer secondary current. Take care to use the correct phasing of the transformer. Ground Power MOSFET N-channel Drain. Connect Primary transformer. Take care to use the correct phasing of the transformer. IGBT Driver output. Power supply. Charge ready open drain output. A resistor from Rsense to VCC or VBAT sets the constant On-time.
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:
[email protected] 2
AT1454/AT1454A/AT1454B
Preliminary Product Information Photoflash Capacitor Charger for DSC Absolute Maximum Ratings*1
Parameter VCC , TRIGGER , DRIVER , CHARGE , FB and READY voltage LX voltage SEC Current Continuous power dissipation (MSOP-10,Ta=+25 C) Junction Temperature Lead Temperature (Soldering 10 sec) HBM MM Storage Temperature ESD Susceptibility*2
O
Rated Value -0.3 to +6.0 +30 ±300 555 125 260 -40~125 2 200
Unit V V mA mW ℃ ℃ ℃ KV V
1. 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. 2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF capacitor discharged through a 1.5KΩ resistor into each pin.
Recommended Operation Conditions
Parameter Power supply voltage Operating temperature LX voltage Symbol VCC Top VLX Min. 2.5 -30 VCC Values Typ. ― +25 ― Max. +5.5 +85 28 Unit V ℃ V
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:
[email protected] 3
AT1454/AT1454A/AT1454B
Preliminary Product Information Photoflash Capacitor Charger for DSC Electrical Characteristics
(VCC=3.3V, Ta=+25℃, unless otherwise noted)
Parameter Input operating voltage Input under-voltage threshold VCC UVLO hysteresis Feedback voltage Shutdown current Quiescent Current Primary side current limit Secondary side transit current LX Switch On-Resistance LX Leakage Current IGBT Driver Rising time IGBT Driver Falling time IGBT Trigger signal high IGBT Trigger signal low Charge input voltage high Charge input voltage low Charge pin Bias current Ready output signal high Ready output signal low Thermal Shutdown
Symbol VCC VUVLO VFB IOFF Icc ILX(MAX) Isec
Test Condition VCC falling Ta=+25℃ CHARGE pin=GND No Switch.