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LT3468ES5 데이터시트 PDF




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부품번호 LT3468ES5 기능
기능 Photoflash Capacitor Charger in ThinSOT
제조업체 Linear Technology
로고 Linear Technology 로고


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LT3468ES5 데이터시트, 핀배열, 회로
FEATURES
s Highly Integrated IC Reduces Solution Size
s Uses Small Transformers:
5.8mm × 5.8mm × 3mm
s Fast Photoflash Charge Times:
4.6s for LT3468 (0V to 320V, 100µF, VIN = 3.6V)
5.5s for LT3468-1 (0V to 320V, 50µF, VIN = 3.6V)
s Controlled Input Current:
500mA (LT3468)
225mA (LT3468-1)
s Supports Operation from Single Li-Ion Cell, or Any
Supply from 2.5V up to 16V
s Adjustable Output Voltage
s No Output Voltage Divider Needed
s Charges Any Size Photoflash Capacitor
s Low Profile (1mm) SOT-23 Package
U
APPLICATIO S
s Digital / Film Camera Flash
s PDA / Cell Phone Flash
s Emergency Strobe
Final Electrical Specifications
LT3468/LT3468-1
Photoflash Capacitor
Charger in ThinSOTTM
October 2003
DESCRIPTIO
The LT®3468/LT3468-1 are highly integrated ICs designed
to charge photoflash capacitors in digital and film cam-
eras. A new control technique* allows for the use of
extremely small transformers. Each device contains an
on-chip high voltage NPN power switch. Output voltage
detection* is completely contained within the device,
eliminating the need for any discrete zener diodes or
resistors. The output voltage can be adjusted by simply
changing the turns ratio of the transformer. The LT3468
has a primary current limit of 1.4A while the LT3468-1 has
a 0.7A limit. These different current limit levels result in
well controlled input currents of 500mA for the LT3468
and 225mA for the LT3468-1. Aside from the differing
current limit, the two devices are otherwise equivalent.
The CHARGE pin gives full control of the part to the user.
Driving CHARGE low puts the part in shutdown. The DONE
pin indicates when the part has completed charging. The
LT3468 series of parts are housed in tiny low profile
(1mm) SOT-23 packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation. *U.S. Patent # 6, 518, 733
TYPICAL APPLICATIO S
DANGER HIGH VOLTAGE – OPERATION BY HIGH VOLTAGE TRAINED PERSONNEL ONLY
VIN
2.5V TO 8V
C1
4.7µF
T1
1:10.2
D1
14
25
+
R1
100k
DONE
VIN SW
LT3468
DONE
GND
D2
320V
COUT
PHOTOFLASH
CAPACITOR
VIN
2.5V TO 8V
C1
4.7µF
T1
1:10.2
D1
45
36
+
R1
100k
DONE
VIN SW
LT3468-1
DONE
GND
D2
320V
COUT
PHOTOFLASH
CAPACITOR
CHARGE
CHARGE
CHARGE
CHARGE
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6-1, LPRI = 10µH, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
Figure 1. LT3468 Photoflash Charger Uses
High Efficiency 4mm Tall Transformer
3468 TA01
C1: 4.7µF, X5R OR X7R, 10V
T1: KIJIMA MUSEN PART# SBL-5.6S-1, LPRI = 24µH, N = 10.2
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ZETEX ZHCS400 OR EQUIVALENT
R1: PULL UP RESISTOR NEEDED IF DONE PIN USED
Figure 2. LT3468-1 Photoflash Charger Uses
High Efficiency 3mm Tall Transformer
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
3468 TA02
34681i
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LT3468ES5 pdf, 반도체, 판매, 대치품
LT3468/LT3468-1
TYPICAL PERFOR A CE CHARACTERISTICS LT3468 curves use the circuit of Figure 1 and
LT3468-1 curves use the circuit of Figure 2 unless otherwise noted.
LT3468 Output Voltage
324
323 TA = –40°C
322
321 TA = 25°C
320
TA = 85°C
319
LT3468-1 Output Voltage
324
323
TA = –40°C
322
TA = 25°C
321
TA = 85°C
320
319
LT3468 Switch Current Limit
1.5
VIN = 3V
VOUT = 0V
1.4
1.3
1.2
318
2345678
VIN (V)
3468 G09
318
2345678
VIN (V)
3468 G10
1.1
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3468 G11
LT3468-1 Switch Current Limit
0.700
0.660
VIN = 3V
VOUT = 0V
LT3468 Switching Waveform
VIN = 3.6V
VOUT = 100V
0.620
0.580
0.540
VSW
10V/DIV
IPRI
1A/DIV
0.500
–40 –20
0 20 40 60
TEMPERATURE (°C)
80 100
3468 G12
1µs/DIV
3468 G13
LT3468-1 Switching Waveform
VIN = 3.6V
VOUT = 100V
LT3468-1 Switching Waveform
VIN = 3.6V
VOUT = 300V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
VSW
10V/DIV
IPRI
1A/DIV
3468 G15
1µs/DIV
3468 G16
LT3468 Switching Waveform
VIN = 3.6V
VOUT = 300V
VSW
10V/DIV
IPRI
1A/DIV
1µs/DIV
3468 G14
LT3468/LT3468-1 Switch
Breakdown Voltage
50 SW PIN IS RESISTIVE UNTIL BREAKDOWN
45 VOLTAGE DUE TO INTEGRATED
RESISTORS. THIS DOES NOT INCREASE
40 QUIESCENT CURRENT OF PART
35
30 T = 25°C
25
20
T = –40°C
T = 85°C
15
10
5
0 VIN = VCHARGE = 5V
0 10 20 30 40 50 60 70 80 90 100
SWITCH VOLTAGE (V)
3468 G17
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LT3468ES5 전자부품, 판매, 대치품
LT3468/LT3468-1
APPLICATIO S I FOR ATIO
Choosing The Right Device (LT3468/LT3468-1)
The only difference between the two versions of the
LT3468 is the peak current level. For the fastest possible
charge time, use the LT3468. The LT3468-1 has a lower
peak current capability, and is designed for applications
that need a more limited drain on the batteries. Due to the
lower peak current, the LT3468-1 can use a physically
smaller transformer.
Transformer Design
The flyback transformer is a key element for any LT3468/
LT3468-1 design. It must be designed carefully and checked
that it does not cause excessive current or voltage on any
pin of the part. The main parameters that need to be
designed are shown in Table 1.
The first transformer parameter that needs to be set is the
turns ratio N. The LT3468/LT3468-1 accomplish output
voltage detection by monitoring the flyback waveform on
the SW pin. When the SW voltage reaches 31.5V higher
than the VIN voltage, the part will halt power delivery. Thus,
the choice of N sets the target output voltage as it changes
the amplitude of the reflected voltage from the output to
the SW pin. Choose N according to the following equation:
N = VOUT + 2
31. 5
Where: VOUT is the desired output voltage. The number
2 in the numerator is used to include the effect of the
voltage drop across the output diode(s).
Thus for a 320V output, N should be 322/31.5 or 10.2.
For a 300V output, choose N equal to 302/31.5 or 9.6.
The next parameter that needs to be set is the primary
inductance, LPRI. Choose LPRI according to the following
formula:
LPRI
VOUT
• 200 • 109
N • IPK
Where: VOUT is the desired output voltage. N is
the transformer turns ratio. IPK is 1.4 (LT3468), 0.7
(LT3468-1)
LPRI needs to be equal or larger than this value to ensure
that the LT3468/LT3468-1 has adequate time to respond
to the flyback waveform.
Table 1. Recommended Transformer Parameters
PARAMETER
LPRI
LLEAK
N
VISO
ISAT
RPRI
RSEC
NAME
Primary Inductance
Primary Leakage Inductance
Secondary: Primary Turns Ratio
Secondary to Primary Isolation Voltage
Primary Saturation Current
Primary Winding Resistance
Secondary Winding Resistance
TYPICAL RANGE
LT3468
>5
100 to 300
8 to 12
>500
>1.6
<300
<40
TYPICAL RANGE
LT3468-1
>10
200 to 500
8 to 12
>500
>0.8
<500
<80
UNITS
µH
nH
V
A
m
34681i
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