Datasheet

Control
Logic
Over
temp
OSC RAMP
INT
SS
VREF
+
-
AVIN
EN
SYNC
SS/TRK
FB
COMP
AGND
PGND
PGOOD
SW
PVIN
PWM
comparator
UVLO
Precision
enable
UVP
SD
Ilimit low
Ilimit high
Zero-cross
Driver
OVP
Powerbad
PWM
0.68V
0.54V
PLL
AVIN
AVIN
PVIN
PVIN
OR
OR
OR
+
-
+
-
+
-
+
-
+
-
EA
+
-
+
-
Driver
2.7V
1.35V
0.6V
LM21215A
SNOSB87B –MARCH 2011–REVISED MARCH 2013 www.ti.com
BLOCK DIAGRAM
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