AS3635 TAOS | Alldatasheet
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Technical content
The technical content of this austriamicrosystems datasheet is still valid. Contact information: Headquarters: ams AG Tobelbaderstrasse 30
8141 Unterpremstaetten, Austria
Tel: +43 (0) 3136 500 0 e-Mail: ams_sales@ams.com Please visit our website at www.ams.com
1 General Description
the charge-pump 20 seconds after charging. photoflash capacitor to ±3% accuracy. over the -30ºC to +85ºC temperature range. ing to handle high voltages. Figure 1. Typical Operating Circuit
2 Key Features
Reliable Flash on/off for IGBT timing.
3 Applications
4 Pinout
Figure 2. Pin Assignments (Top Through View) Table 1. Pin Description for AS3635
5 Absolute Maximum Ratings
Table 2. Absolute Maximum Ratings
- Depending on actual PCB layout and PCB used
- Assembled on PCB board (requires capacitor CVBAT); special PCB layout (spark gaps) and external resistors
6 Electrical Characteristics
TAMB = +25ºC, unless otherwise specified. Table 3. Electrical Characteristics
- Minimum VVBAT is set to 2.51V to allow a little margin to maximum VUVLO undervoltage lockout of 2.5V.
- Setting CHARGE=1 resets the timeout timer. Additionally the timeout timer is automatically stopped at power
on reset and once it has expired.
- Measured with VBAT=3.7V, CHARGE or FLASH = 1.26V
Table 3. Electrical Characteristics (Continued)
7 Typical Operating Characteristics
QIGBT=RJP4002ANS, ISW=750mA. Figure 3. Charging Waveform Figure 4. Charging Time vs. VBAT Figure 5. Charging Waveform VBAT=2.51V Figure 6. Charging Waveform VBAT=4.2V Figure 7. Efficiency vs. VFLASH Figure 8. Efficiency vs. Charging Time
8 Detailed Description
charges VFLASH to the final charging voltage (e.g. 320V) and the IGBT driver starts the actual Xenon flash. independent of the battery supply. output voltage resulting in an improved use of the available energy in the photoflash capacitor. Figure 15. Internal circuit color balancing (between pre-flash and flash cycle).
Figure 16. AS3635 Charging Cycle without recharging between Pre-Flash and Flash
Figure 18. AS3635 Charging Cycle Details The input CHARGE is set to high and charging begins (1). voltage VCFLASH on the flash capacitor CFLASH rises (5). CHARGE is set to low afterwards (9), DONE returns to high (10) finishing a full charging cycle. Note: For simplicity the number of actual charging cycles (NMOS SW on/off) are reduced in Figure 18.
- The 8 cycles required for actual detection of the end of charge conditions are not shown in Figure 18.
Figure 19. AS3635 trimming circuit2
- The production test equipment starts a charging cycle (CHARGE=1) and waits until DONE=0
- The voltage on VFLASH is measured and a correction code is calculated
- The trimmode control is unlocked using a special sequence
- The one time programmable memory (OTP) is programmed with the above calculated code
- The trimmode control can be disabled by fusing the OTP bit trimm_lock
setup and the trimming procedure.
Figure 20. IGBT Driver circuit antee at least 4V driving signal for the IGBT). not add any external pulldown resistor on pin IGBT_GATE.
- Exception: If the Sanyo IGBT TIG058E8 is used, add a series resistor of 50Ω for the gate drive. For Rene-
sas RJP4006AGE add a series resistor of 68Ω.
Figure 21. ESD Diodes
- Exception: The diode between SW and PGND is designed to be operated in forward direction for very
short pulses during charging.
9 Application Information
specification during charging.
- Powering of the Xenon tube and generating together with the oscillation circuit consisting of TTRIG, CTRIG,
- Switching off the current through the Xenon tube at the end of the flash pulse to accurately control the light
to different trigger coils and IGBTs. Table 4. Recommended Transformers Table 5. Recommended IGBTs
- Add a series resistor of 68Ω in the gate drive.
- Add a series resistor of 47Ω in the gate drive.
higher value capacitors as shown in Table 6 is possible, but will increase the charging time. If a different output capacitor is chosen, ensure low ESR values and voltage ratings. Table 6. Recommended Photoflash Capacitors
- Different capacitor values are possible to be used together with the AS3635. Lower capacitor value will reduce
- A low parasitic capacitance improves charging efficiency.
Table 7. Recommended Rectification Diodes Table 8. Recommended CVBAT and CV5V Capacitor
www.austriamicrosystems.com/AS3635 1.4-8 17 - 20 AS3635 Datasheet - Application Information PCB Layout Guideline Following layout recommendations apply: 1. Keep the path (and area) of GND - CVBAT - VBAT - TCHARGE(primary) - SW - GND as short as possible to min- imize the leakage inductance of TCHARGE and ensure a proper supply connection for the AS3635 2. Place CVBAT as close as possible to the AS3635. 3. Ensure wide and short PCB paths for the path GND - CFLASH - XFLASH - QIGBT - GND to allow 150A to flow dur- ing the flash pulse. Connect this GND only at a single place to the main GND plane. 4. The IGBT has two ground connections: One ground for the driving input and one ground for the power path. 5. Ensure larger spacings for all high voltage paths; check with the PCB manufacturer to ensure proper minimum spacing for 320V paths and 4kV (Xenon tube trigger pin) paths. 6. Minimize the parasitic capacitance of the PCB on the anode of DCHARGE especially to GND and VFLASH 7. See austriamicrosystems “WLP-CSP-Handling-Guidelines_1V0.pdf” for proper handling, PCB layout and sol- dering of the WL-CSP AS3635 device. See austriamicrosystems demoboard layout (described in application note ‘AN3635’). ams AG Technical content still valid
Figure 22. 9 pin WL-CSP 1.5x1.5mm Marking Figure 23. 9 pin WL-CSP 1.5x1.5mm Package Dimensions
The devices are available as the standard products shown in Table 9. Note: All products are RoHS compliant and austriamicrosystems green. Table 9. Ordering Information
www.austriamicrosystems.com/AS3635 1.4-8 20 - 20 AS3635 Datasheet - Ordering Information Copyrights Copyright © 1997-2011, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriami- crosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life- sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the tech- nical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 Schloss Premstaetten A-8141 Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact ams AG Technical content still valid