AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Features General Description • 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. The AT1452 is a charger control IC for Photoflash capacitor with soft start function, adjustable maximum duty cycle, auto refresh and autodischarge circuit. Adjustable soft start is programmed with an external capacitor on SS pin. It is ideal for DSC flash unit. Applications •Digital Still Cameras flash unit Block Diagram 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: [email protected] 1 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Pin Configuration Ordering Information Part number AT1452A Package 8-pin Plastic SOP 8-pin Plastic TSSOP 8-pin Plastic SOP 8-pin Plastic TSSOP AT1452B Remarks AT1452AS AT1452AP AT1452BS AT1452BP A:50kHz B:100kHz Pin Description Pin No. Symbol I/O 1 2 3 4 5 6 7 8 CHARGE FB DUTY GND OUT VCC READY SS I I I O O I Description Charge enable input Error amplifier input Duty control input Ground Push-pull output Power supply Charge ready open drain output Soft-start setting 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: [email protected] 2 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Absolute Maximum Ratings Parameter 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 Condition — — — — TSSOP8（Ta=+25℃） SOP8（Ta=+25℃） — — — — Rated Value Min. Max. +7 -50 50 6.5 450 500 -30 +85 +125 -40 +150 +300 Unit V mA mA V mW mW 0 C 0 C 0 C 0 C 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 (Ta=+250C) Parameter Power supply voltage Operating temperature Symbol VCC TOP Values Min. 2.5 -30 Typ. -+25 Unit Max. 5.5 +85 Ｖ °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: [email protected] 3 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Electrical Characteristics (VCC = 3.3V,Ta =+25℃, unless otherwise noted.) Parameter Symbol Condition Values Unit Min. Typ. Max. Entire device Input Supply Range VCC Feedback Voltage VFB Auto-Refresh Level VFB1 Feedback Voltage line-regulation VFB-Line 2.5 5.5 V 1.089 1.1 1.111 VFB1 / VFB V - 90 - % - 1 5 mV - 0.5 5 % CHRGE=GND - - 400 μA Duty=50%, fOSC=50KHz - 1.0 - mA A 40 50 60 kHZ B 90 100 110 kHZ - 0.3 - V VCC=2.5V to 5.5V Ta =-30℃ to +85℃ Feedback Variation with Temperature -- Standby current ICCS Operating Current ICC Frequency fosc Threshold voltage of SS VSS_0 Soft-Start and Duty Threshold voltage of SS Section Charging current Maximum duty cycle VSS 100 ISS TDUTY Duty Cycle=100% VSS=0V -- 1.1 1.0 -- 90 V μA % ISOURCE ISINK ROH ROL Duty≧95%, OUT=0V Duty≦5%, OUT=5V OUT = -15mA OUT = 15mA 65 - -130 100 18 16 -80 30 25 mA mA Ω Ω 0.8 V V Oscillator Output Section Charge ON/OFF Section Output source current Output sink current Output ON resistor Output OFF resistor Active mode Threshold Disable mode Threshold VONH VONL Duty Cycle=0% 2.0 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: [email protected] 4 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Timing Chart AT1452 Auto Refresh Mode AT1452 Charge Toggling Refresh Mode 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: [email protected] 5 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC CH1:Vout(310V) CH2:READY CH3:SS CH4:IBAT Fig 1. Charge ON Soft-Start (VCC=3.3V VBAT=1.8V CSS=10uF) Fig 2. Auto-Refresh (VCC=3.3V VBAT=1.8V CSS=10uF) 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: [email protected] 6 AT1452 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 + RDUTY ( KΩ) = DUTY 1.15 15 1.1 ( ) − 1.073 VDUTY example: Set duty cycle is 50% VDUTY = 0.3 + RDUTY = 0.5 = 0.734 1.15 15 1.1 ( ) − 1.073 0.734 ≈ 35.2 KΩ 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: [email protected] 7 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Typical Application Schematic (A) IGBT Trigger 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: [email protected] 8 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC (B) SCR Trigger 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: [email protected] 9 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC (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: [email protected] 10 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC CH1:READY CH2: CHARGE CH3:IBAT CH4:VOUT(290V) Fig3. VCC=3.0V VBAT=3.0V Fig4. VCC=3.0V VBAT=2.5V 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: [email protected] 11 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Fig5. VCC=3.0V VBAT=2.0V 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: [email protected] 12 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Small Outline 8-pin Plastic SOL SYMBOL A B C D E F H J K M L e1 α INCHES MIN MAX 0.188 0.197 0.149 0.158 0.228 0.244 0.050 BSC 0.013 0.020 0.004 0.010 0.053 0.069 0.011 0.019 0.007 0.010 0.016 0.050 0.150 REF 450 0 80 0 MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 5.80 6.20 1.27 BSC 0.33 0.51 0.10 0.25 1.35 1.75 0.28 0.48 0.19 0.25 0.40 1.27 3.81 REF 450 0 0 80 NOTES - 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: [email protected] 13 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Small Outline 8-pin TSSOP SYMBOL A B C D E F H K M α INCHES MIN MAX 0.114 0.122 0.169 0.177 0.244 0.260 0.026 BSC 0.010 0.012 0.002 0.006 0.041 0.047 0.005 BSC 0.020 0.028 80 00 MILLIMETERS MIN MAX 2.90 3.10 4.30 4.50 6.20 6.60 0.65 BSC 0.25 0.30 0.05 0.15 1.05 1.20 0.127 BSC 0.50 0.70 00 80 NOTES - 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: [email protected] 14 AT1452 Preliminary Product Information Photoflash Capacitor Charger for DSC Reflow Condition (IR/Convection or VPR Reflow) Reference JEDEC Standard J-STD-020A Classification Reflow Profiles Convection or IR/Convction Average Heating Rate(180°C to peak) 5°C/second max. 120 seconds max. Preheat Temperature(125±20°C) 10~150 seconds Temperature maintained above 180°C Time within 5°C of actual Peak 10~20 seconds Temperature Peak Temperature Range(Note 1) 219~225°C or 235~240°C Cooling Rate 6°C /second max. 6 minutes max. Time 25°C to Peak Temperature VPR 10°C/second max. 60 seconds 219~225°C or 235~240°C 10°C/second max. *1 The maximum peak temperatures for IR and VP reflow are depending on package dimensions. Package Reflow Conditions Pkg. Thickness ≥2.5mm Pkg. Thickness <2.5mm Pkg. Thickness <2.5mm and and and all bags Pkg. Volume ≥350 mm3 Pkg. Volume <350 mm3 Convection 219~225°C VPR 219~225°C IR/Convection 219~225°C Convection 235~240°C VPR 235~240°C IR/Convection 235~240°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: [email protected] 15