ISL78228_15 Datasheet, PDF (13/18 Pages) Intersil Corporation – Dual 800mA Low Quiescent Current 2.25MHz High Efficiency Synchronous Buck Regulator

Block Diagram
ISL78228
SHUTDOWN
SOFT
START
+
EN1
BANDGAP ^0.6V _{+ EAMP}
-
FB1
1.6k
3pF
SLOPE
COMP
+
+
0.3V
SCP
-
27pF
200k
+
-COMP
PG
SGND
+
VIN
0.552V _-
1M
PG1
1ms
DELAY
OSCILLATOR
SHUTDOWN
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
+
OCP
-
+
SKIP
-
+
CSA1
-
0.59V
0.09V
ZERO-CROSS
SENSING
SHUTDOWN
SOFT
START
EN2
BANDGAP ^0.6V _EAMP
-
27pF
200k
+
COMP
-
FB2
1.6k
3pF
SLOPE
COMP
+
-
0.3V _+SCP
+
0.552V _-
PG2
THERMAL
SHUTDOWN
SHUTDOWN
SHUTDOWN
PWM/PFM
LOGIC
CONTROLLER
PROTECTION
DRIVER
+
OCP
-
+
CSA-2
0.59V
+
SKIP
-
0.09V
ZERO-CROSS
SENSING
VIN
LX1
PGND
SYNC
VIN
LX2
PGND
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FN7849.3
April 13, 2015