Datasheet

+–
VIN
12V to 21V
M4
R
B
M3
L4
L3
D4
D3
C
OUT
R
A
C
SS
R
RT
2
T3
T4
R
DMX
2
C
REF
R
S
3
R
S
4
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CAOA
CAOBPKLMT
GND
VAO
VINAC
VSENSE
CSA
CSB
RT
CDR
SS
GDB
GDA
IMO VCC
RSYNTH
VREF
DMAX
RDM
R
IMO
To CSA2
To CSB2
12V to 21V
M2
M1
L2
L1
C
PC
C
ZC
R
ZC
R
ZC
R
RT
1
T1
T2
R
DMX
1
R
PK1
R
PK2
R
S
1
R
S
2
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
CAOA
CAOBPKLMT
GND
VAO
VINAC
VSENSE
CSA
CSB
RT
CDR
SS
GDB
GDA
IMO VCC
RSYNTH
VREF
DMAX
RDM
To CSB1
To CSA1
R
B
R
A
D2
D1
VREF1
From Ixfrms
R
SYN
1
VREF1
Vin
From Ixfrms
VREF2
Synchronized
Clocks
w/ 180
o
Phase Shift
CSB1
CSA1
CSB2
CSA2
R
SYN
2
R
ZC
R
ZC
C
ZC
C
ZC
C
ZC
C
PC
C
PC
C
PC
C
REF
C
ZV
R
ZV
C
PV
V
OUT
UCC28070
SLUS794E – NOVEMBER 2007–REVISED APRIL 2011 www.ti.com
Figure 18. Simplified Four-Phase Application Diagram Using Two UCC28070
20 Copyright © 2007–2011, Texas Instruments Incorporated