XR76115 Datasheet, PDF (4/16 Pages) Exar Corporation – 15A Synchronous Step Down COT Regulator

XR76115
Block Diagram
VCC
TON
VIN
PGOOD
SS
FB
EN/MODE
Enable LDO
LD O
VCC UVLO
4.25 V
+
-
VCC
OT P
TJ
+
150 C
-
10uA
+
-
Switching
Enabled
FB
0.6V
Current
emulation &
DC correction
VIN
On-Time
Switching
Enabled
0.6 V
PGOOD comparator
+
0.555 V
-
Short-circuit detection
0.36 V
+
-
1.9 V
Enable LDO
Enable LDO
+
-
CCM or CCM/DCM
+
3V
-
Zero Cross Detect
SW
+
-2 mV
-
Feedback
comparator
+
-
Switching
Enabled
RQ
SQ
RQ
SQ
TON
Minimum
On Time
Dead
Time
Control
En able
Hiccup
Hiccup
Mode
If 8 consecutive ZCD
Then DCM
If 1 no n-ZCD
Then exit DCM
If four
consecutive OCP
OCP
comparator
50uA
VCC
VCC
BST PVIN
GH
SW
GL
AGND
ILIM
Figure 3: XR76115 Block Diagram
PGND
© 2015 Exar Corporation
4/16
www.exar.com
Rev. 1B