SLUU077C – September 2000 – Revised November 2002
4
UCC3817 BiCMOS Power Factor Preregulator
UDG-01001
1
11
7
16
GND
DRVOUT
R17
20
Ω
15
C3
1
µ
F CER
VCC
C2
100
µ
F AI EI
14
C1 560 pF
13
C4 0.01
µ
F
12
R1 12
k
Ω
R3 20
k
Ω
R2
499
k
Ω
R4
249
k
Ω
R5 10
k
Ω
C5 1
µ
F
9
4
10
VCC
CT
SS
RT
VSENSE
OVP/EN
VREF
VAOUT
3
8
2
VFF
C6 2.2
µ
F
C7 150 nF
R7
100
k
Ω
6
5
R9
4.02
k
Ω
C8 270 pF
R8 12
k
Ω
D6
(OPTIONAL)
R10
4.02
k
Ω
D5
(OPTIONAL)
R11
10
k
Ω
R12
2
k
Ω
R14
0.25
Ω
5
W
C13
0.47
µ
F
600 V
C14
1.5
µ
F
400 V
R13
383
k
Ω
IAC
R15
51
k
Ω
R16
100
Ω
VCC
C10
1
µ
F
C11
1
µ
F
D7
D8
L1
1 mH
D2
8 A, 600 V
D1
6 A, 600 V
C12
220
µ
F
450 V
VOUT
385VDC
+
PKLIMIT
CAOUT
CAI
MOUT
IAC
VO
UCC3817
VLINE
85–265
VRMS
VREF
C9 1.2 nF
R6 30
k
Ω
6 A
600 V
D3
F1
R21
383
k
Ω
R19
499
k
Ω
R20
274
k
Ω
C15
3.3
µ
F
D4
Q1
GND
AC2
AC1
VREF
IAC
VO
VO
HIGH VOLTAGE –
SEE EVM WARNINGS
AND RESTRICTIONS
HIGH TEMPERATURE –
SEE EVM WARNINGS
AND RESTRICTIONS
HIGH VOLTAGE –
SEE EVM WARNINGS
AND RESTRICTIONS
NOTE: High-Voltage component. See EVM Warnings and Restrictions at the back of this document.
NOTE: High-Temperature component. See EVM Warnings and Restrictions at the back of this document.
Figure 1. Evaluation Board Schematic
2
Operating Guidelines
The operating guidelines for the evaluation board are provided with reference to the schematic in Figure 1.
NOTE: In order for the output voltage to regulate, a load of 10 W must be applied to the evaluation
board’s output. In order to maintain power factor near unity, the voltage loop is designed with a slow
frequency response. Large transient steps in output current can cause the evaluation module to go
out of regulation.