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PDF AS3635 Data sheet ( Hoja de datos )
| Número de pieza | AS3635 | |
| Descripción | Xenon Flash Driver | |
| Fabricantes | austriamicrosystems | |
| Logotipo |  |
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Datasheet
AS3635
Xenon Flash Driver with 5V IGBT Control
1 General Description
The AS3635 is a highly integrated photoflash charger
with build in IGBT driver.
A build in 5V charge-pump guaranties constant IGBT
drive at any battery voltage. The build in timer turns off
the charge-pump 20 seconds after charging.
In circuit fuse trimming allows to set the voltage on the
photoflash capacitor to ±3% accuracy.
The AS3635 is available in a space-saving WL-CSP
package measuring only 1.5mm x 1.5mm and operates
over the -30ºC to +85ºC temperature range.
Warning: Lethal voltages are present on applications
using AS3635! Do not operate without train-
ing to handle high voltages.
Figure 1. Typical Operating Circuit
2 Key Features
Build in 5V charge-pump for IGBT gate drive
Photoflash voltage accuracy programmable to ±3%
(in circuit One Time Programmable - OTP)
Trip voltage accuracy ±1.5%
Small Size 1.5mm x 1.5mm x 0.6mm
PCB: No microvias need
Average input current < 320mA
Few external components
- No Schottky-Diode needed
- No output voltage divider needed
Reliable Flash on/off for IGBT timing.
Charge time < 4sec @ Vbat>2.7V, CFLASH =22µF
Charge complete indicator
Undervoltage lockout
Available in a tiny WL-CSP Package
3x3 balls 0.5mm pitch, 1.5x1.5mm package size
3 Applications
Xenon Flash driver for mobile phones, PDA and DSC
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AS3635
www.austriamicrosystems.com/AS3635
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1 page  
AS3635
Datasheet - Electrical Characteristics
Table 3. Electrical Characteristics (Continued)
Symbol
Parameter
Condition
Min Typ Max
VIH
High Level Input
Voltage
Pins CHARGE, FLASH;
1.26
VIL
Low Level Input
Voltage
pin DONE in trimmode
0.0 0.54
VOL
Low Level Output
Voltage
Pin DONE, ILOAD=4mA
0.2
ILEAK
Leakage current
Pin DONE
-1 +1
Pulldown resistance to
RPD
GND3
Pins CHARGE, FLASH
52
Recommended Transformer parameters - see Table 4, “Recommended Transformers,” on page 15
LPRIMARY Primary Inductance
6
LLEAK
Primary Leakage
Inductance
0.4
N
VISOLATION
Turns Ratio
Isolation Voltage
for VFLASH=320V (final charged
voltage on CFLASH)
10.2
500
ISATURATION
Primary Saturation
Current
0.84
RPRIMARY
Primary Winding
Resistance
0.4
RSECUNDAR Secondary Winding
Y Resistance
60
Unit
V
V
V
µA
kΩ
µH
µH
V
A
Ω
Ω
1. Minimum VVBAT is set to 2.51V to allow a little margin to maximum VUVLO undervoltage lockout of 2.5V.
2. Setting CHARGE=1 resets the timeout timer. Additionally the timeout timer is automatically stopped at power
on reset and once it has expired.
3. Measured with VBAT=3.7V, CHARGE or FLASH = 1.26V
www.austriamicrosystems.com/AS3635
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5 Page 
AS3635
Datasheet - Detailed Description
A typical charging cycle and its voltages and current on the different pins and signals are shown in Figure 18:
Figure 18. AS3635 Charging Cycle Details
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The input CHARGE is set to high and charging begins (1).
During a single cycle, the internal NMOS transistor connects the pin SW to PGND (2). Therefore the current ISW rises
(3) until it reaches ISW current limit (4). Then the energy is transferred to the secondary side of the transformer and the
voltage VCFLASH on the flash capacitor CFLASH rises (5).
The output voltage VCFLASH gradually increases and once it hits the end of charge detection threshold (6) (detected on
VSW during the off time of the NMOS transistor between SW and PGND) 8 times (7)1, DONE is pulled low (8). When
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.
1. The 8 cycles required for actual detection of the end of charge conditions are not shown in Figure 18.
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11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AS3635.PDF ] | |
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