XR75100 Datasheet, PDF (6/15 Pages) Exar Corporation – 40V Synchronous Step Down COT Controller

Functional Block Diagram
XR75100
VCC
TON
VIN
PGOOD
SS
FB
EN/Mode
Enable LDO
LDO
VCC UVLO
4.25 V
+
-
VCC
TJ
150 C
OTP
+
-
Switching
Enabled
FB
0.6V
Switching
Enabled
10uA
+
-
0.6 V
PGOOD comparator
+
0.555 V
-
Short-circuit detection
0.36 V
+
-
1.9 V
Enable LDO
Enable LDO
+
-
Forced CCM or DCM/CCM
+
3V
-
Zero Cross Detect
SW
+
-1 mV
-
Current
emulation & VIN
DC correction
On-Time
Feedback
comparator
+
-
Switching
Enabled
RQ
SQ
RQ
SQ
TON
Minimum
On Time
Dead
Time
Control
Enable
Hiccup
Hiccup
Mode
If 8 consecutive ZCD
Then DCM
If 1 non-ZCD
Then exit DCM
If four
consecutive OCP
50uA
OCP
+ - ^comparator
VCC
VCC
AGND ILIM
PGND
BST
GH
SW
GL
© 2016 Exar Corporation
6 / 15
exar.com/XR75100
Rev 1C