LT3580
TYPICAL APPLICATIONS
High Voltage Positive Power Supply Uses Tiny 5.8mm × 5.8mm × 3mm Transformer and Switches at 200kHz
Danger High Voltage! Operation by High Voltage Trained Personnel Only
V
T1
OUT
V
350V
4.5mA (V = 5V)
IN
1:10.4
3.3V TO 5V
7, 8
4.7μH
5, 6
1
4
IN
IN
•
2.5mA (V = 3.3V)
D1
•
C2
68nF
D2
V
SW
IN
FOR ANY V
BETWEEN 50V TO
OUT
GND
350V, CHOOSE R ACCORDING TO
FB
SHDN
R
4.22M*
FB
LT3580
V
– 1.215
OUT
R
=
RT
FB
FB
83.3μA
VC
FOR 5V INPUT, KEEP MAXIMUM
OUTPUT POWER AT 1.58W
FOR 3.3V INPUT, KEEP MAXIMUM
OUTPUT POWER AT 0.88W
SYNC
SS
10k
100pF
C1
2.2μF
464k
0.47μF
10nF
*MAY REQUIRE MULTIPLE SERIES
RESISTORS TO COMPLY WITH
MAXIMUM VOLTAGE RATINGS
3580 TA05a
C1: 2.2μF, 25V, X5R, 1206
C2: TDK C3225X7R2J683M
D1: VISHAY GSD2004S DUAL DIODE CONNECTED IN SERIES
D2: ON SEMICONDUCTOR MBR0540
T1: TDK LDT565630T-041
Start-Up Waveforms
I
PRIMARY
1A/DIV
V
OUT
50V/DIV
3580 TA05b
5V INPUT
NO LOAD
2ms/DIV
Switching Waveforms
V
OUT
2V/DIV
AC COUPLED
I
PRIMARY
1A/DIV
3580 TA05c
5V INPUT
4.5mA LOAD
2μs/DIV
3580fc
22
Linear [ Linear ]
