AS3635
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
External Components
Transformers T CHARGE and T TRIG
Following transformers are recommend for the AS3635 (due to the OTP programming features see section Trimming
Procedure on page 12 , the output voltage V FLASH can be programmed):
Table 4. Recommended Transformers
Component
T CHARGE
T TRIG
Part Number
C3-T2.5R
TTRN-3825H
TTRN-3822H
TTRN-5820H
TTRN-0520H
LDT4520T-01
ATB322515
BO-02
N
10.2
10.2
10.2
10.2
10.41
10.2
10.2
L
6.7μH
7μH
7μH
8.87μH
8.35μH
10μH
7μH
Size (mm)
3.4x3.4x2.5
3.8x3.8x2.5
3.8x3.8x2.2
5.8x5.8x2.0
5.0x5.0x2.0
4.7x4.5x2.0
3.2x2.5x1.55
(H is max)
7.3x2.5(3.5)x2.2
Manufacturer
Mitsumi Electric
www.mitsumi.co.jp
Tokyo Coil
www.tokyo-coil.co.jp
TDK
www.tdk.com
Tokyo Coil
www.tokyo-coil.co.jp
Always check if the voltage on the pin SW does never exceed the AS3635 maximum V SW (see Table 3 on page 4 )
specification during charging.
IGBT
As the AS3635 has an internal charge pump included, 2.5V, 2.7V and 4V IGBT can be used without limit on the supply
V VBAT . The IGBT is used for two purposes:
1. Powering of the Xenon tube and generating together with the oscillation circuit consisting of T TRIG , C TRIG ,
R TRIG a sufficiently high trigger pulse to ignite the Xenon tube (about 3.5kV) - this is accomplished by a fast ris-
ing edge of the gate of the IGBT
2. Switching off the current through the Xenon tube at the end of the flash pulse to accurately control the light
emitted by the flash. To protect the IGBT the switching off falling edge voltage should be less than 400V/μs
(measured on the emitter of the IGBT)
Both requirements are achieved with the internal driving circuit of the AS3635. Internal OTP trimming allows to adopt
to different trigger coils and IGBTs.
Table 5. Recommended IGBTs
Component
Q IGBT
Part Number
RJP4002ANS
RJP4003ANS
1
RJP4006AGE
GT8G133
min. Drive Voltage
2.5V
4.0V
2.7V
4.0V
Size
VSON-8
3 x 4.8mm
2.85x3.05x1.1
mm (H is max.)
TSSOP-8
3.3 x 6.4mm
Manufacturer
Renesas
www.renesas.com
Toshiba
www.semicon.toshiba.co.jp
TIG058E8
2
4.0V
ECH8
2.8 x 2.9mm
Sanyo
www.sanyo.com
1. Add a series resistor of 68 Ω in the gate drive.
2. Add a series resistor of 47 Ω in the gate drive.
www.austriamicrosystems.com/AS3635
1.4-8
15 - 20
相关PDF资料
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AS3647-ZWLT IC LED DVR 1600MA FLASH 13WLCSP
AS3648-ZWLT-500 IC WHITE LED FLASH DVR 13WLCSP
AS3665-ZWLT IC LED DRIVER SMARTLIGHT 25WLCSP
AS3685B-T IC DVR PHOTOFLASH 1A 10-DFN
AS3685C-T IC DVR PHOTOFLASH 1A 10-DFN
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