lt3571 Linear Technology Corporation, lt3571 Datasheet - Page 7

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

BLOCK DIAGRAM
R4
EXTERNAL
CONTROL
BLOCK
FB
C2
C3
R3
16
14
15
8
2
APD
MON
CTRL
FB
SYNC
1V
APD CURRENT
MIRROR
–
+
+
A2
1V
+
+
+
–
SOFT-START
Figure 1. Block Diagram
A3
A6
EAMP
ADJUST
FREQ
A1
9
Q2
+
–
R5
R
T
RAMP GENERATOR
FB
2MHz TO 250kHz
OSCILLATOR
R
1V
C
C
C
–
+
C
V
11
PL
IN
COMPARATOR
A4
x5
PWM
R1
R2
–
+
R
S
, C
SHDN
R
3
S
12
R
MONIN
OPTIONAL SOFT-START COMPONENTS
SENSE
S
REFERENCE
Q
C
MAIN SWITCH
R
S
1.22V
S
4
DRIVER
V
OUT
A5
D1
OFF
C
+
–
I
ON
5, 6
SW
Q1
MAIN
SWITCH
7, 10
V
GND
L1
REF
3571 F01
13
LT3571
C
IN
V
IN
7
3571f