RT8206A/B
Function Block Diagram
TON SKIP
BOOT1
BOOT2
UGATE1
PHASE1
UGATE2
PHASE2
PV
PV
CC
CC
SMPS1
PWM Buck
Controller
SMPS2
PWM Buck
Controller
LGATE1
PGND
LGATE2
VOUT2
VOUT1
FB1
FB2
ILIM2
ILIM1
PGOOD1
PGOOD2
GND
BYP
SW Threshold
VCC
PVCC
ENLDO
EN1
Internal
Logic
Power-On
Sequence
Clear Fault Latch
EN2
LDO
VIN
Thermal
Shutdown
REF
REF
LDO
Function Block Diagram
TON
VIN
UGATE
Q
R
T
OFF
On-Time
Compute
VOUT
REF
T
ON
TRIG 1-Shot
Q
1-Shot
TRIG
+
-
Comp
-
-
+
+
LGATE
Over-Voltage
V
CC
FB
+
Fault
Latch
1.1 x V
0.7 x V
REF
REF
-
-
Blanking
Time
+
-
ILIM
+
Under-Voltage
Current
Limit
-
0.9 x V
+
+
-
SS
Time
REF
PGOOD
+
-
25kHz
Detector
PHASE
Zero
Detector
SKIP
PWM Controller (One Side)
www.richtek.com
4
DS8206A/B-03 December 2009
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
