概述
数据手册AT1454A 概述
Photoflash Capacitor Charger for DSC 照相闪光灯电容充电器DSC
AT1454A 数据手册
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PDF下载AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Feature
Description
• 2.5V to 5.5V Supply Voltage Operating
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.
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.
The device allows user to control automatic refresh
rate on Charge pin. While the Ready pin signals
that the capacitor is fully charged.
Application
• Digital / Film Camera Flash
• PDA / Cell Phone Flash.
AT1454/AT1454A/AT1454B is available in
MSOP-10 package.
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
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
1
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Pin Configuration
1
0
7
4
9
8
6
5
1454
3
1
2
Ordering Information
Part number
Package
Marking
AT1454M_GRE
AT1454AM_GRE
AT1454BM_GRE
MSOP-10 , Green
MSOP-10 , Green
MSOP-10 , Green
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
I / O
Description
1
2
3
CHARGE
I
I
I
Charge enable input
Comparator input
FB
TRIGGER
IGBT Trigger signal input.
Detecting transformer secondary current. Take care to use the
correct phasing of the transformer.
4
5
6
ISEC
I
P
I
GND
LX
Ground
Power MOSFET N-channel Drain. Connect Primary transformer.
Take care to use the correct phasing of the transformer.
IGBT Driver output.
7
8
DRIVER
VCC
READY
Rsense
O
P
O
I
Power supply.
9
Charge ready open drain output.
A resistor from Rsense to VCC or VBAT sets the constant On-time.
10
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
2
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Absolute Maximum Ratings*1
Parameter
Rated Value
Unit
VCC , TRIGGER , DRIVER , CHARGE , FB and READY voltage -0.3 to +6.0
V
V
LX voltage
+30
SEC Current
±300
555
mA
mW
℃
Continuous power dissipation (MSOP-10,Ta=+25OC)
Junction Temperature
125
Lead Temperature (Soldering 10 sec)
Storage Temperature
260
℃
-40~125
2
℃
ESD Susceptibility*2
HBM
MM
KV
V
200
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
Symbol
Values
Unit
Min.
2.5
-30
Typ.
Max.
+5.5
+85
28
Power supply voltage
VCC
―
+25
―
V
℃
V
Operating temperature Top
LX voltage
VLX
VCC
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
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
Symbol
Test Condition
Min. Typ. Max. Units
Input operating voltage
VCC
―
2.5
―
―
5.5
―
―
V
V
Input under-voltage threshold VUVLO VCC falling
VCC UVLO hysteresis
2.1
100
mV
V
Feedback voltage
Shutdown current
Quiescent Current
VFB
IOFF
Icc
Ta=+25℃
1.08 1.10 1.12
CHARGE pin=GND
No Switching , FB=1.2V
―
0.01
40
1
µA
µA
A
―
―
―
―
―
―
―
―
―
60
―
―
―
6
Primary side current limit
Secondary side transit current Isec
ILX(MAX)
2.5
5
mA
Ω
LX Switch On-Resistance
LX Leakage Current
RLX(ON) ILX=2A
0.17
0.01
55
ILC
VLX=28V
µA
ns
VCC=3.3V, CL=3900pF
VCC=3.3V, CL=8200pF
VCC=3.3V, CL=3900pF
VCC=3.3V, CL=8200pF
―
―
―
―
IGBT Driver Rising time
tr
90
ns
55
ns
IGBT Driver Falling time
IGBT Trigger signal high
tf
90
ns
0.45Vc
c
―
―
V
IGBT Trigger signal low
Charge input voltage high
Charge input voltage low
Charge pin Bias current
―
0.9
―
―
―
―
―
3
0.3Vcc
―
V
V
VON
0.1V hysteresis
VCHARGE =3.3V
VOFF
0.8
V
―
µA
Ready output signal high
100kΩ from Vcc to Ready
pin
33µA into Ready pin
―
―
3.27
V
Ready output signal low
Thermal Shutdown
―
―
1.0
0
mV
―
140
℃
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
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
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
5
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Typical Operating Characteristics
VLX & Primary Current ，Time(1us/Div) [CH2:VLX; CH4:IPRI
]
Vout=100V
VLX(5V/Div)
IPRI(1A/Div)
VLX & Primary Current ，Time(1us/Div) [CH2:VLX; CH4:IPRI
]
Vout=300V
VLX(10V/Div)
IPRI(1A/Div)
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
6
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
VLX & Secondary Current ，Time(1us/Div) [CH2:VLX; CH4:ISEC
]
Vout=100V
VLX(5V/Div)
ISEC(50mA/Div
Charging waveform without auto-refresh function , Time(1 s/Div)
VCC=3.3V, VBAT=4.2V, C=120uF
CH1:READY CH2:CHARGE CH3:Output Voltage
CH4:Input Current
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
7
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Charging waveform with auto-refresh function , Time(1 s/Div)
VCC=3.3V, VBAT=3.0V, C=47uF
CH1:READY CH2:CHARGE CH3:Output Voltage CH4:Input Current
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
8
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Application Circuit
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
9
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
10
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
11
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Application Information
AT1454 series is designed to precise control of switching current to charge photoflash
capacitors quickly and efficiently. When the Charge pin is first driven high, a one shot
set SR latches in the correct state. The built-in power MOSFET turns on and primary
current ramps up linearly according to VBAT and primary inductance. Comparator
monitors the switch On-time and when the switch on-time reaches limit value,
MOSFET is turned off. During this phase, stored energy of primary transformer is
delivered to the photoflash capacitor via the secondary and diode. The secondary
current is decreased linearly at a rate determined by the secondary inductance. The
secondary current is monitored by the Isec pin. When the secondary current drops
below 10mA, the fires a one shot will turn on MOSFET. The charging cycle repeats to
deliver power to the output.
AT1454 series can adjust external resistance RSENSE to set N-MOS switch on-time, but
switch on-time value must match with electrical characteristic of transformer. It is
usually equal to or less than saturation current of transformer otherwise transformer
will be saturated. Therefore, efficiency will be reduced.
The output voltage is detected by a voltage divider connecting to output capacitor.
When the output voltage reaches the desired voltage set by resistive voltage-divider,
comparator output goes high which resets the master latch and disable the charging
block. The N-channel MOSFET is turned off pulling the Ready pin high, indicating
that the part has finished charging. Power delivery can be restarted automatically
when feedback voltage is less than 90% of reference voltage. Power delivery can only
be restarted by toggling the Charge pin. The Charge pin gives full control of the part
to the user. The IGBT buffer will provide a sufficient current to drive IGBT to ignite
flash tube.
Transformer Design
The Fly-back transformer is a key element for AT1454 series. It must be designed
carefully and checked that it does not cause excessive current or voltage on any pin of
the part. The first transformer parameter that needs to be set is the turns ratio N,
should be high enough so that the absolute maximum voltage rating for the NMOS
drain to source voltage is not exceeded. Choose the minimum turns ratio according to
following formula:
VOUT
VDS(MAX ) −VBAT
NMIN
≥
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
12
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Vout: Target Output Voltage
VDS(MAX):Maximum drain to source voltage of NMOS.
Adjustable Output Voltage
The AT1454/1454A/B senses output voltage by a voltage divider connecting to output
terminal. R7 to (R8+R9) ratio determines the output voltage as shown in the
application circuit Figure 1. The feedback reference voltage is 1.1V. Calculate the
remaining resistors with following equations:
R8 + R9
VOUT =VFB × (1+
)
R7
R8and R9 must be greater than 0805 size resistor for enduring secondary HV.
Rectifying Diode
The rectifying diode should be low capacitance type with sufficient reverse
recovery-voltage and forward current ratings. The peak reverse recovery-voltage that
diode is approximately:
V
PK-R≅ VOUT + (N x VCC)
The peak current of the diode is simply:
PK-SEC= IPK-PRI / N
I
Primary Inductance
A fly-back transformer needs to store substantial amounts of energy in the core during
each switching cycle. The transformer will generally require an air gap. The use of an
air gap in the core makes the energy storage. While the power switch is off, energy
transferred to the output capacitor is proportional to the primary inductance for a
constant primary current. The primary inductance needs to be equal or larger than a
certain minimum value to ensure that AT1454 series has adequate time to respond to
the fly-back waveform. The switch off time should be 500ns or larger for the AT1454
series. The minimum inductance can be calculated with the following formula:
−9
500×10 ×VOUT
LPRI
≥
N × IPK −PRI
Vout: Target Output Voltage
N: Transformer Turns Ratio
IPK-PRI: Primary Peak Current
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
13
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Leakage Inductance and Parasitic Capacitance
The leakage inductance on the primary of the transformer results in the first spike
voltage when NMOS turns off. The spike voltage is proportional to the leakage
inductance. The spike voltage must not exceed the dynamic rating of the NMOS drain
to source voltage. It is important not to minimize the leakage inductance to a very
low level. Although this would result in a very low leakage spike, the parasitic
capacitance of the transformer will be high between windings. This will result in the
initial spike of current in the primary becoming excessively high while the NMOS
turns on. Therefore, trade off is necessary between leakage inductance and parasitic
capacitance.
Spike Voltage @Switching，Time(1us/Div)
Swing Current @Switching，Time(1us/Div)
VLX(5V/Div) , IPRI(1A/Div)
VLX(10V/Div) , IPRI(1A/Div)
Spike Voltage
CH1
Swing Current
CH2
CH1:VLX; CH2:Input Current
Transformer Secondary Capacitance
The total capacitance on the secondary of the transformer will severely affect the
efficiency of the circuit. Any secondary capacitance is multiplied by N2 when
reflected to the primary. Since this capacitance forms a resonant circuit with the
primary leakage inductance of the transformer. As such, both the primary leakage
inductance and secondary side capacitance should be minimized.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
14
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Adjustable Input Current
The AT1454/1454A/B can adjust N-MOS switch on-time by a resistor connecting to
Rsense pin. This resistor determines the primary peak current and on-time of primary
N-MOS as the following equation:
−6
VBAT × 2×10
V
25KΩ
R4 + 25KΩ
IPK −PRI
=
,VRsense =VBAT (or,VCC ) ×
Rsense × LPRI
IPK −PRI × LPRI
TON
=
VBAT
where
LPRI: primary inductance (µH)
IPK-PRI: peak primary current (A)
R4: It is recommended several KΩ grade
If setting constant on-time by a resistor R10 is connected to VCC, then R4 resistor
need to remove from application circuitry. In this case, on-time is a constant. At
another topology, if R4 connect to VBAT to set constant on-time, then R10 need to
remove from application circuitry. However, on-time can change dependent on VBAT
because battery voltage level is different from full energy to low power. External
capacitor Css is connected to VCC and Rsense to perform soft-start function to reduce
inrush current on VBAT input current and avoid the internal switching noise.
T1
ST-982610A
1:25
L1 33uH
/Option
VBAT
R10
10uH/6.1mH
C1
22u/6V3
VCC
R4
Css
0.1uF
VCC
Rsense
LX
Isec
AT1454/AT1454A/AT1454B
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
15
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Auto-Refresh
AT1454 supports auto-refresh function required in some DCS application. When the
output capacitor is charged complete, the READY pin will goes high and Vout will
decrease slightly due to leakage current. The refresh block trip point is VFBx90%.
While the Vout is decreased to the refresh trip point, it enables the charge block,
disable the refresh block and pull low the READY pin. This cycle of recharge
operation will repeat again until charge pin is pulled low.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the AT1454 series.
When the junction temperature exceeds Tj=140 ℃, a thermal sensor activates the
thermal protection, which shuts down the IC, allowing the IC to cool. Once the device
cools down by 15 ℃, IC will automatically recover normal operation. For continuous
operation , do not exceed the absolute maximum junction-temperature rating of
Tj=130 ℃.
Prevent the Leakage of READY pin
CHARGE
READY
VCC
READY
If pull-high resistor of READY signal connect to Charge pin, then it can reduce power
consumption on pull-high resistor of READY during charge pin goes low.
Board Layout
The high voltage operation of the AT1454/AT1454A/AT1454B demands careful
attention to board layout. You will not get advertised performance with careless layout.
Keep the area for the high voltage end of the secondary as small as possible. Also note
the larger than minimum spacing for all high voltage nodes in order to meet
breakdown voltage requirements for the circuit board. Remember that lethal voltages
are present in this circuit. Use caution when working with the circuit.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
16
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Outline 10-pin MSOP
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
17
AT1454/AT1454A/AT1454B
Preliminary Product Information
Photoflash Capacitor Charger for DSC
Reflow Profiles
Profile Feature
Sn-Pb Eutectic Assembly
Pb-Free Assembly
Large Body
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3
Small Body
Pkg. thickness
<2.5mm or Pkg.
volume <350mm3
Large Body
Small Body
Pkg. thickness
≥2.5mm or Pkg.
Pkg. thickness
≥2.5mm or Pkg.
volume ≥350mm3 volume ≥350mm3
3°C/second max.
Average ramp-up rate
3°C/second max.
(T to T )
L
P
Preheat
-Temperature Min(Tsmin)
-Temperature Max (Tsmax)
-Time (min to max)(ts)
100°C
150°C
150°C
200°C
60-120 seconds
60-180 seconds
3°C/second max.
Tsmax to T
L
-Ramp-up Rate
Time maintained above:
-Temperature (T )
L
183°C
217°C
60-150 seconds
60-150 seconds
-Time (t )
L
Peak Temperature(T )
P
225+0/-5°C
10-30 seconds
240+0/-5°C
10-30 seconds
245+0/-5°C
10-30 seconds
250+0/-5°C
20-40 seconds
Time within 5°C of actual Peak
Temperature (t )
P
Ramp-down Rate
6°C/second max.
6 minutes max.
3°C/second max.
8 minutes max.
Time
25°C
to
Peak
Temperature
*All temperatures refer to topside of the package, measured on the package body surface.
7F, No.9,PARK AVENUE. II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.
Tel: 886-3-563-0878
3/24/2006 REV:1.2
Fax: 886-3-563-0879
WWW: http://www.aimtron.com.tw
Email: service@aimtron.com.tw
18
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| AT15 | ETC | Analog IC | 获取价格 |
|
| AT15-0001 | TE | Digital Attenuator, 31 dB, 5-Bit, TTL Driver DC - 2.0 GHz | 获取价格 |
|
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