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UCC3857 Datasheet

  • UCC3857

  • Isolated Boost PFC Preregulator Controller

  • 129.78KB

  • 10頁

  • TI

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UCC1857
UCC2857
UCC3857
Isolated Boost PFC Preregulator Controller
FEATURES
鈥?/div>
PFC With Isolation, V
O
< V
IN
鈥?/div>
Single Power Stage
鈥?/div>
Zero Current Switched IGBT
鈥?/div>
Programmable ZCS Time
鈥?/div>
Corrects PF to >0.99
鈥?/div>
Fixed Frequency, Average Current
Control
鈥?/div>
Improved RMS Feedforward
鈥?/div>
Soft Start
鈥?/div>
9V to 18V Supply V Range
鈥?/div>
20-Pin DW, N, J, and L Packages
PRELIMINARY
DESCRIPTION
The UCC3857 provides all of the control functions necessary for an Iso-
lated Boost PFC Converter. These converters have the advantage of trans-
former isolation between primary and secondary, as well as an output bus
voltage that is lower than the input voltage. By providing both power factor
correction and down conversion in a single power processing stage, the
UCC3857 is ideal for applications which require high efficiency, integration,
and performance.
The UCC3857 brings together the control functions and drivers necessary
to generate overlapping drive signals for external IGBT switches, and pro-
vides a separate output to drive an external power MOSFET which pro-
vides zero current switching (ZCS) for both the IGBTs. Full programmability
is provided for the MOSFET driver delay time with an external RC network.
ZCS for the IGBT switches alleviates the undesirable turn off losses typi-
cally associated with these devices. This allows for higher switching fre-
quencies, smaller magnetic components and higher efficiency. The power
factor correction (PFC) portion of the UCC3857 employs the familiar aver-
age current control scheme used in previous Unitrode controllers. Internal
circuitry changes, however, have simplified the design of the PFC section
and improved performance.
(continued)
TYPICAL APPLICATION CIRCUIT
T1
RECTIFIED
AC INPUT
C
F
BIAS
SUPPLY
QA
Q1
Q2
+
V
OUT
鈥?/div>
R
S
REF
R
AC
13
3
7
CA鈥?/div>
Z
C
OPTO
8
4
15
VD
FEEDBACK
CKT
PKLMT MOUT
1
IAC
CAO VIN
MOSDRV
2
CRMS
VA鈥?/div>
UCC3857
14
IGDRV1
16
10
Z
V
11
IGDRV2
VAO
18
DELAY
12
REF
REF
5
VREF
SS
20
RT
19
CT
20
PGND
17
AGND
6
UDG-98065
02/99

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