Datasheet

LT8582
8
8582f
BLOCK DIAGRAM
Figure 1. Block Diagram
–
+
250k
1.84V
1.31V
50k
V
IN1
2.1V
VC1
55mV
DRIVER
DISABLE
I
SWA1
COMPARATOR
DIE TEMP
165°C
V
IN1
22.2V
(MIN)
2A
(MIN)
GND
SWA1
SWB1
8582 BD
START-UP
AND FAULT
LOGIC
SOFT-START
RQ
S
SR1
DRIVER
–
+
–
+
–
+
–
+
–
+
–
+
–
+
FBX1
1.15V
65mV
FBX1
–
+
–
+
7#&t
T
D
~ 30ns
–
+
1.204V
REFERENCE
FREQUENCY
FOLDBACK
ADJUSTABLE
OSCILLATOR
14.5k
A1
A2
–
+
A3
–
+
A4
SYNC1 RT1
SS1
CLKOUT**
V
C1
14.5k
÷N
UVLO
SYNC
BLOCK
RAMP
GENERATOR
SHDN1
SS1
C
SS
28m
Q2
Q1
R
S
22m
R
T
R
C
C
C
V
OUT
V
IN
R
GATE
FBX1
R
FBX
PG1GATE1
1mA
M
1
R
PG
L1
D1
OPTIONAL
C
IN
C
OUT1
C
OUT2
**BLOCK DIAGRAM FOR CH1 IS SHOWN. BLOCK DIAGRAM FOR CH2 IS IDENTICAL, EXCEPT CLKOUT SIGNAL FOR CH1 IS 180° OUT OF PHASE
WITH THE INTERNAL OSCILLATOR AND HAS A FIXED 50% DUTY CYCLE AND CLKOUT SIGNAL FOR CH2 IS IN PHASE WITH THE INTERNAL OSCILLATOR
AND ITS DUTY CYCLE VARIES LINEARLY WITH THE PART’S JUNCTION TEMPERATURE.