LT3482 LINER [Linear Technology], LT3482 Datasheet - Page 10

• Manufacturer Part Number: LT3482
• Description: 90V Boost DC/DC Converter with APD Current Monitor
• Manufacturer: LINER [Linear Technology]

LT3482
OFF ON
TYPICAL APPLICATIO S
OFF ON
10
3.3V
V
V
5V
IN
IN
3.3V to 70V APD Bias Power Supply with Fast Current Monitor Response
C1
1µF
C1
1µF
C1: MURATA X7R GRM21BR71C105KA01B
C2: AVX 06035C104KAT2A
C3, C6: AVX 08051C104KAT2A
C4, C5: MURATA X7R GRM31MR71H474KA01B
L1: COILCRAFT ME3220-682ML OR EQUIVALENT
C1: MURATA X7R GRM21BR71C105KA01B
C2: AVX 06035C104KAT2A
C3, C6: AVX 08051C104KAT2A
C4, C5: MURATA X7R GRM31MR71H474KA01B
C7: MURATA GRM2167U1H103JA01B
L1: COILCRAFT ME3220-103KL OR EQUIVALENT
5V to 85V APD Bias Power Supply
10µH
6.8µH
L1
10nF
L1
C7
V
f
SHDN
CTRL
GND
V
f
SHDN
CTRL
GND
SET
SET
IN
IN
SW
MON
SW
MON
R4
10k
LT3482
LT3482
0.1µF
0.1µF
C2
C2
R3
10k
PUMP
PUMP
MONIN
APD
MONIN
APD
V
V
V
V
OUT2
OUT1
OUT2
OUT1
FB
FB
U
70V
AT 2mA
85V
AT 2.5mA
C3
0.1µF
C4
0.47µF
C5
0.47µF
C4
0.47µF
C5
0.47µF
APD Input Load for Current Monitor
Step Response Measurement
C6
0.1µF
NODE A
C6
0.1µF
100Ω
R2
1M
R3
16.5k
R1
3482 TA02a
R1
1M
R2
14k
2
10k
2k
3482 TA03a
APD
C3
0.1µF
2mA
0mA
5V
0V
REF GND
REF GND
20V/DIV
V
2V/DIV
NODE A
V
MON
60
50
30
20
10
60
50
40
30
20
10
40
0
0
0
0
0.5
Current Monitor Step Response
0.5
1
Effi ciency
Effi ciency
I
I
MONIN
1
MONIN
1.5
500ns/DIV
(mA)
(mA)
2
1.5
2.5
2
3482 TA02b
3
3482 TA03b
3482 TA03c
3482fa
3.5
2.5