AS3635 datasheet(18/21 Pages) AMSCO

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AS3635

Datasheet - A p p l i c a t i o n I n f o r m a t i o n

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’).

AS3635 Datenblatt(PDF) 18 Page - ams AG