Texas Instruments UCD3138 - Page 28

Fusion Power Peripheral
DPWM2
AD
_
08
COMP
_
E
COMP
_
D
EAP1
DPWM1
PI
(Gv)
+
+
-
-
UCD 3138
Vref
Vb
Ev
Iin
CLA
1
(
Gc)
Calculate
Vrms
Calculate
1/Vrms
2
Iref
A
B
c
Cycle by cycle limit
Ui
Vrms
Conditioning
&
Rectification
Km
DPWM1B
DPWM2B
Vbus_sen
Vin_n
I_CT1
I_CT2
EAP2
UART
Interface
Vin_l
AD
_
07
Cycle by cycle limit
Vbus_ov
AD
_
03
COMP
_
F
OVP
PMBus
Interface
FE1
FE2
-
I_CT2
I_CT1
Iin
Bridgeless PFC
Configuration
Fusion Power Peripheral
DPWM2
AD_03
COMP
_
E
COMP
_
D
AD
_
07
DPWM1
PI
(Gv)
+
+
-
-
UCD 3138
Vref
Vb
Ev
Iin
CLA
1
(
Gc
)
Calculate
Vrms
Calculate
1/Vrms
2
Iref
A
B
c
Cycle by cycle limit
Ui
Vrms
Conditioning
&
Rectification
Km
FE0
DPWM1B
DPWM2B
Vbus_sen
Vin_n
I_CT1
I_CT2
I_shunt
EAP
0
UART
Interface
Vin_l
AD
_
08
Cycle by cycle limit
Vbus_ovCOMP
_
F
OVP
PMBus
Interface
2-phase interleaved
PFC
Configuration
Digital PFC Description www.ti.com
12.2.2 UCD3138 Pin Definition in 2-Phase PFC
UCD3138 pin definition in 2-phase interleaved PFC control, shown in Figure 29.
Figure 29. Definition of UCD3138 in 2-Phase PFC Control
12.2.3 UCD3138 Pin Definition in Bridgeless PFC
UCD3138 pin definition shown in bridgeless PFC control, see Figure 30.
Figure 30. Definition of the UCD3138 in Bridgeless PFC Control
28
Digitally Controlled Single-Phase PFC Pre-Regulator SLUU885B–March 2012–Revised July 2012
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