LTC3441 Просмотр технического описания (PDF) - Linear Technology
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LTC3441 Datasheet PDF : 20 Pages
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LT3420/LT3420-1
TYPICAL APPLICATIO S
DANGER HIGH VOLTAGE
OPERATION BY HIGH VOLTAGE
TRAINED PERSONEL ONLY
VBAT
1.8V TO 6V
C1
4.7µF
LT3420 Photoflash Charging Circuit uses Low Cost Toroid Transformer
T1
1:12
3
4
D1
320V
Efficiency
VCC
2.5V TO 10V
CHARGE
DONE
2
1
R1
52.3k
23
6
4
C2
4.7µF
9
8
VBAT RFB
VCC
LT3420
CHARGE
DONE
SW
SEC
RREF
C4
7
100µF +
330V
PHOTOFLASH
CAPACITOR
1
CT
GND
90
VIN = 5V
80
VIN = 3.3V
70
60
50
10
C3
0.1µF
5 R2
2k
40
VCC = VBAT = VIN
50 100 150 200 250 300 350
C1, C2: 4.7µF, X5R or X7R, 10V
C4: RUBYCON 100µF PHOTOFLASH CAPACITOR
T1: PULSE PA0367 FLYBACK TRANSFORMER
D1: GENERAL SEMICONDUCTOR GSD2004S SOT-23
DUAL DIODE. DIODES CONNECTED IN SERIES
3420 TA02a
VOUT (V)
3420 TA02b
Charging Waveform
VOUT
50V/DIV
VCHARGE
5V/DIV
VBAT = 3.3V
0.5s/DIV
3420 TA02c
Charge Time
10 VOUT CHARGED
FROM
50V TO 320V
8
6
COUT = 220µF
4
2
COUT = 100µF
0
2
4
6
8
10
VBAT (V)
3420 TA02d
3420fa
17
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