Texas Instruments UCD3138 User Manual

Vs
RL
Vbus
Q1
D1
Cb
Rs1
EMI Filter
& Inrush
Relay
Gate
Driver
L1Iin
L2
D2
Q2
Signal
Conditioning
Signal
Conditioning
Vin
Signal
Conditioning
Signal
Conditioning
I_CT1 I_CT2
DPWM1B
DPWM2B
Vin_l
Vbus_sen
Vin_n
Vbus_ov
Vs
RL
Vbus
Q1
D1
Cb
Signal
Conditioning
Rs1
EMI Filter
& Inrush
Relay
Gate
Driver
L1Iin
L2
D2
Q2
D3
Signal
Conditioning
Signal
Conditioning
Vin
Iq1
Iq2
Signal
Conditioning
Signal
Conditioning
I_CT1 I_CT2
DPWM1 B DPWM 2B
Vin_l Vbus_sen
I_shunt
Vin_n
Vbus_ov
Digital PFC Description www.ti.com
12.1.2 2-Phase PFC Block Diagram
A functional block diagram of a 2-phase interleaved PFC is shown in Figure 26. The digital controlled 2-
phase interleaved PFC has the same power stage seen in other analog controlled devices. All signals
interact with UCD3138 and are explained in section 12.2.
Figure 26. Digitally Controlled 2-Phase PFC System Block Diagram
12.1.3 Bridgeless PFC Block Diagram
A function block diagram of a bridgeless PFC is shown in Figure 27. The digital controlled bridgeless PFC
has a same power stage as those seen in analog controlled. All signals interacted with UCD3138 are
explained in the section Section 12.2.
Figure 27. Digitally Controlled Bridgeless PFC System Block Diagram
26
Digitally Controlled Single-Phase PFC Pre-Regulator SLUU885B–March 2012–Revised July 2012
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Texas Instruments UCD3138 Specifications

General

Brand	Texas Instruments
Model	UCD3138
Category	Power Supply
Language	English