AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Feature
•
2.5V to 5.5V Supply Voltage Operating
•
•
•
•
•
•
•
•
•
•
•
Range.
Low Current Consumption:1mA in operation.
Adjustable Output Voltage.
Adjustable Switch On-Time.
Charge Complete Indicator.
Built-in IGBT Driver.
Soft-Start Circuitry.
Thermal Protection
Charges Any Size Photoflash Capacitor.
AT1454 with Auto-Refresh Function.
AT1454A/B without Auto-Refresh Function.
Small 10-lead MSOP Package.
Description
The AT1454 series is a charger IC for Photoflash
capacitor with soft-start function, an IGBT driver
for igniting flash tube, adjustable output voltage
and adjustable switch on-time to perform energy
transition on each charge cycle. The output voltage
can be adjusted by simply changing the turn ratio
of transformer. AT1454B is sensed by voltage
divider connecting to the anode of the rectifying
diode. The voltage sensing path is cut off when
charging function to be completed to maintain
minimum output voltage decay.
The device allows user to control automatic refresh
rate on Charge pin. While the Ready pin signals
that the capacitor is fully charged.
AT1454/AT1454A/AT1454B
MSOP-10 package.
is
available
in
Application
•
Digital / Film Camera Flash
•
PDA / Cell Phone Flash.
Block Diagram
Aimtron reserves the right without notice to change this circuitry and specifications.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email:
service@aimtron.com.tw
1
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Pin Configuration
1
0
9
8
7
6
1454
1
2
3
4
5
Ordering Information
Part number
AT1454M_GRE
AT1454AM_GRE
AT1454BM_GRE
Package
MSOP-10 , Green
MSOP-10 , Green
MSOP-10 , Green
Marking
AT1454, Date code with one bottom line
AT1454A, Date code with one bottom line
AT1454B, Date code with one bottom line
*
For more marking information, contact our sales representative directly
Pin Description
Pin N0.
Symbol
1
CHARGE
2
FB
3
TRIGGER
4
5
6
7
8
9
10
I
SEC
GND
LX
DRIVER
VCC
READY
Rsense
I/O
I
I
I
I
P
I
O
P
O
I
Description
Charge enable input
Comparator input
IGBT Trigger signal input.
Detecting transformer secondary current. Take care to use the
correct phasing of the transformer.
Ground
Power MOSFET N-channel Drain. Connect Primary transformer.
Take care to use the correct phasing of the transformer.
IGBT Driver output.
Power supply.
Charge ready open drain output.
A resistor from Rsense to VCC or V
BAT
sets the constant On-time.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email:
service@aimtron.com.tw
2
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Absolute Maximum Ratings
*1
Parameter
VCC , TRIGGER , DRIVER , CHARGE , FB and READY voltage
LX voltage
SEC Current
Continuous power dissipation (MSOP-10,Ta=+25
O
C)
Junction Temperature
Lead
Temperature (Soldering 10 sec)
HBM
MM
Storage Temperature
ESD Susceptibility*2
Rated Value
-0.3 to +6.0
+30
±300
555
125
260
-40~125
2
200
Unit
V
V
mA
mW
℃
℃
℃
KV
V
1. 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
.
2. Device are ESD sensitive. Handling precaution recommended. The Human Body model is a 100pF
capacitor discharged through a 1.5KΩ resistor into each pin.
Recommended Operation Conditions
Parameter
Power supply voltage
Operating temperature
LX voltage
Symbol
VCC
Top
V
LX
Min.
2.5
-30
VCC
Values
Typ.
―
+25
―
Max.
+5.5
+85
28
Unit
V
℃
V
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email:
service@aimtron.com.tw
3
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Electrical Characteristics
(VCC=3.3V, Ta=+25℃, unless otherwise noted)
Parameter
Input operating voltage
Input under-voltage threshold
VCC UVLO hysteresis
Feedback voltage
Shutdown current
Quiescent Current
Primary side current limit
Secondary side transit current
LX Switch On-Resistance
LX Leakage Current
IGBT Driver Rising time
IGBT Driver Falling time
IGBT Trigger signal high
IGBT Trigger signal low
Charge input voltage high
Charge input voltage low
Charge pin Bias current
Ready output signal high
Ready output signal low
Thermal Shutdown
Symbol
VCC
V
UVLO
V
FB
I
OFF
Icc
I
LX(MAX)
Isec
Test Condition
VCC falling
Ta=+25℃
CHARGE pin=GND
No Switching , FB=1.2V
Min.
2.5
―
―
1.08
―
―
―
―
―
―
―
―
―
―
0.45Vc
c
Typ. Max. Units
―
2.1
100
1.10
0.01
40
2.5
5
0.17
0.01
55
90
55
90
―
―
―
―
3
3.27
1.0
140
5.5
―
―
1.12
1
60
―
―
―
6
―
―
―
―
―
0.3Vcc
V
V
mV
V
µA
µA
A
mA
Ω
µA
ns
ns
ns
ns
V
V
V
V
µA
V
mV
℃
R
LX(ON)
I
LX
=2A
I
LC
tr
tf
V
LX
=28V
VCC=3.3V, C
L
=3900pF
VCC=3.3V, C
L
=8200pF
VCC=3.3V, C
L
=3900pF
VCC=3.3V, C
L
=8200pF
―
V
ON
V
OFF
V
CHARGE
=3.3V
100kΩ from Vcc to Ready
pin
33µA into Ready pin
0.1V hysteresis
0.9
―
―
―
―
―
―
0.8
―
―
0
―
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email:
service@aimtron.com.tw
4
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Timing Chart
Vcc
Trige
READY
VOUT
CHARGE
Charge On
Timing
Power OFF
Timing
Shutdown
Charging
Auto charge to Refresh
Storbe
AT1454 Auto-Refresh Mode
Vcc
Trige
READY
VOUT
CHARGE
Charge On
Timing
Power OFF
Timing
Shutdown
Charging
Toggling CHARGE to Refresh
Storbe
1.uP Detected READY pin Low ->High(Charge Complete)
-->allow enter refresh mode or strobe tube
2.Use uP to delay Photoflash Capacitor self-discharge time Ts
3.Toggling CHARGE pin high->low->high, force the IC into refresh
charging mode.
AT1454A/B Charge Toggle-Refresh (Soft-ware control)Mode
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
Fax: 886-3-563-0879
WWW:
http://www.aimtron.com.tw
3/24/2006 REV:1.2
Email:
service@aimtron.com.tw
5
Embedded System
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