lt3571 Linear Technology Corporation, lt3571 Datasheet - Page 13

• Manufacturer Part Number: lt3571
• Description: 75v Dc/dc Converter For Apd Bias
• Manufacturer: Linear Technology Corporation

TYPICAL APPLICATIONS
2mV/DIV
I
APD
= 1mA
APD Bias Ripple
V
5V
IN
2μs/DIV
L: TDK VLF4012AT-220MR51
C1: TDK X7R C1608X7R1C105KT
C2: MURATA X7R GRM21AR72A224KAC5L
C3: AVX X7R 06031C103K
C4: MURATA X7R GRM188R72A104KA35
C5: MURATA X7R GRM155R7H103K
C6: MURATA X7R GCM155R471C473K
C1
1μF
CONTROL BLOCK
EXTERNAL
R5
20k
5V to 69V APD Bias Supply with Soft-Start
C5
47nF
C5
10nF
3571 TA06
R3
10k
MON
SHDN
V
CTRL
GND
REF
V
SYNC
IN
LT3571
R
22μH
T
L1
R
33.2k
400kHz
T
SW
MONIN
APD
V
OUT
R4
49.9Ω
FB
74V
69V, 2mA
500
450
400
350
300
250
200
150
100
50
C3
10nF
C4
0.1μF
0
0
Input Power vs APD Current
R
20Ω
R1
1M
R2
13.7k
SENSE
0.5
ADP CURRENT (mA)
3571 TA05
C2
0.22μF
1
1.5
3571 TA07
LT3571
2
13
3571f