XR79106 Datasheet, PDF (10/19 Pages) Exar Corporation – 22V, 6A Synchronous Step-Down

XR79106
Functional Block Diagram
VIN
PGOOD
SS
FB
EN/
MODE
VCC
TON
BST
PVIN
Enable LDO
LDO
V_CC UVLO
4.25V
V_CC
OTP
T_J
150 C
10µA
Switching
Enabled
FB 0.6V
Current
Emulation &
DC Correction
V_IN
On Time
V_CC
C_IN
1µF
PGND
Switching
Enabled
0.6V
PGOOD Comparator
0.555V
Short-Circuit Detection
0.36V
Enable LDO
Enable LDO
1.9V
CCM or CCM/DCM
3V
Zero Cross Detect
SW
-2mV
Feedback
Comparator
Switching
Enabled
RQ
SQ
R Q ^tON
SQ
Dead
Minimum
On Time
Time
Control
Enable
Hiccup
Hiccup
Mode
If 8 Consecutive
ZCD Then DCM
If 1 Non-ZCD
Then Exit DCM
If Four
Consecutive OCP
OCP
Comparator
50µA
C_BST
0.1µF
GH
L
V_CC
GL
XR79106
SW
VOUT
AGND
ILIM
PGND
Figure 24. Functional Block Diagram
REV1B
10/19