Texas Instruments UCC3817-EVM User manual

User’s Guide
1
UCC3817 BiCMOS Power Factor
Preregulator Evaluation Board
User’s Guide

SLUU077C –September 2000 –Revised November 2002
2UCC3817 BiCMOS Power Factor Preregulator
UCC3817 BiCMOS Power Factor Preregulator
Evaluation Board
Mike O’Loughlin Power Supply Control Products
Contents
1 Introduction 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.1 Features 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2 Description 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Operating Guidelines 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Step 1: Load Connections 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Step 2: Applying Input Power 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Step 3: Measuring the Evaluation Board’s Performance 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Evaluation Board Layouts 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Evaluation Board Components 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Typical Performance 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Additional Information 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SLUU077C –September 2000 –Revised November 2002
3
UCC3817 BiCMOS Power Factor Preregulator
1 Introduction
This user’s guide details the Texas Instruments (TI) UCC3817–EVM BiCMOS Power Factor Preregulator
Evaluation Module (EVM) SLUU077. It includes a list of EVM features, a brief description of the module
illustrated with pictorial and schematic diagrams and EVM specifications.
The UCC3817 evaluation board is designed to illustrate the performance of the controller in a 250 W boost
converter with power factor correction. The board is designed to handle a universal input operating voltage
range (i.e. 85–265 V ac) with a regulated 385 V dc output.
CAUTION:
Proper precautions must be taken
when working with the board
DHigh voltage levels are present on the evaluation board whenever it is energized.
DThe output capacitor has high levels of energy storage and it must be discharged before the load is removed.
Improper handling of the evaluation board could cause serious injury.
DIt is important to maintain the ambient temperature around the evaluation board to below 40°C during
operation
1.1 Evaluation Module Features
DDesigned for Compliance with IEC 1000-3-2 (Low Total Harmonic Distortion)
DWorldwide Line Operation 85 VRMS to 265 VRMS
DRegulated 385-V, 250-W(max), dc Output
DAccurate Power Limiting
DAccurate Overvoltage Protection
1.2 Description
The UCCx817 provides all the functions necessary for active power-factor-corrected preregulators. The
controller achieves near-unity power factor by shaping the ac input-line current waveform to correspond to that
of the ac input-line voltage. Average current-mode control maintains stable, low-distortion, sinusoidal line
current.
The controller’s operation is similar to previously designed Unitrode preregulators with an added feature to
reduce the RMS-current in the boost capacitor. The controller uses leading-edge modulation that, when
synchronized properly with a downstream dc-to-dc converter, reduces the RMS current in the boost capacitor.

SLUU077C –September 2000 –Revised November 2002
4UCC3817 BiCMOS Power Factor Preregulator
UDG-01001
1
11
7
16GND DRVOUT
R17
20 Ω
15
C3
1µF CER
VCC
C2
100µF AI EI
14 C1 560 pF
13 C4 0.01µF
12 R1 12
kΩ
R3 20
kΩ
R2
499
kΩR4
249
kΩ
R5 10
kΩ
C5 1µF
9
4
10
VCC
CT
SS
RT
VSENSE
OVP/EN
VREF
VAOUT
3
8
2
VFF
C6 2.2µF
C7 150 nF
R7
100
kΩ
6
5
R9
4.02
kΩ
C8 270 pF
R8 12
kΩ
D6
(OPTIONAL)
R10
4.02
kΩ
D5
(OPTIONAL)
R11
10
kΩ
R12
2
kΩ
R14
0.25Ω5
W
C13
0.47µF
600 V
C14
1.5 µF
400 V
R13
383
kΩ
IAC
R15
51
kΩ
R16
100 Ω
VCC
C10
1µFC11 1µF
D7 D8
L1
1 mH D2
8 A, 600 V
D1
6 A, 600 V
C12
220µF
450 V
VOUT
385VDC
+
PKLIMIT
CAOUT
CAI
MOUT
IAC
VO
UCC3817
VLINE
85–265
VRMS
VREF
C9 1.2 nF
R6 30
kΩ
6 A
600 V
D3
F1
R21
383
kΩ
R19
499
kΩ
R20
274
kΩ
C15
3.3µF
D4
Q1
GND
AC2
AC1
VREF
IAC
VOVO
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.

SLUU077C –September 2000 –Revised November 2002
5
UCC3817 BiCMOS Power Factor Preregulator
2.1 Step 1. Load Connections
A resistive or electronic load should be applied to the output connections of VOand GND.
NOTE: For safety reasons the load should be connected before power is supplied to the evaluation
board.
2.2 Step 2. Applying Input Power
A 50- or 60-Hz ac power source not exceeding 265 VRMS needs be applied across terminals AC1 and AC2 for
proper operation.
2.3 Step 3. Measuring the Evaluation Board’s Performance
With the ac source set between 85 VRMS and 265 VRMS, the output voltage should be regulated and the input
current should track the input-voltage shape with near-unity power factor. The operation of the circuit is verified
over the line and load range and shows efficiency in the 90–95% range. At lighter loads, there may be some
distortion in the line current due to DCM operation. Please refer to Figure 3 and Figure 4 for typical evaluation
board performance.
3 Evaluation Board Layouts
R16 R10
R9
R11
C9
C8
C10
C11
R21
R13
C2
C3
U1
R5
R4
R3
R19
R2
R1
R20
SYNC
VCC
R22
C1
C4
D4
C5
R6
R7
C14
C7
C15
C6
D5 D6
R8
R12
FA1
UCC3817 EVALUATION BOARD
D3
AC1
XC12
AC2 C13
D8 L1
XL1
D7 R18
R15
D2
D1
V0
Q1
HS1
GND
C12
GND
R17
R14
HIGH TEMPERATURE
SEE EVM WARNINGS
AND RESTRICTIONS
HIGH VOLTAGE
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 2. UCC3817 Evaluation Board Layout Assembly

SLUU077C –September 2000 –Revised November 2002
6UCC3817 BiCMOS Power Factor Preregulator
4 Evaluation Board Components
. Bill of Materials
Reference Qty DESCRIPTION Manufacturer Part Number
C1 1 560 pF, 50 V, ceramic Panasonic ECU–S1H561JCA
C2 1 100 µF, 25 V, electronic Panasonic EEU–FC1V101S
C3, C5 21 µF, 50 V, ceramic Panasonic ECU–S1H105MEB
C4 1 0.01 µF, 50 V, ceramic Panasonic ECU–S1H103KBA
C6, C15 22.2 µF, 50 V, ceramic Panasonic ECU–S1H225MEB
C7 1 150 nF, 50 V, ceramic, ±10% Panasonic ECU–S1H154KBB
Capacitors C8 1270 pF, 50 V, ceramic, ±10% Panasonic ECU–S1H271JCA
Ca acitors
C9 1 1.2 nF, 50 V, ceramic, ±10% Panasonic ECU–S1H122JCB
C10, C11 21 µF, 50 V, stacked metal poly Panasonic ECQ–V1H105JL
C12 1 220 µF, 450 V electronic Panasonic ECO–S2WB221DA
C13 1 0.47 µF, 600 V (optional for user, not used on EVM) Panasonic ECQ–E6474KF
C14 1 1.5 µF, 400 V Poly Panasonic ECW–F4155JB
C16 1 Not used Panasonic ECU–S2A330JCA
D1 1 6 A, 600 V, ultra fast diode International Rectifier HFA08TB60
D2 1 8 A, 600 V, 400 A surge General Instruments GI756CT
D3 1 6 A, 600 V, bridge General Instruments PB66
Diodes D4, D5,
D7, D8 41 A, 40 V, schottky 1N5819
D6 1 100 mA, 20 V, schottky BAT85
D9 1 Not used
F ses
F1 1 6 A, 250 V, 3 AG glass fast acting cartridge type
Fuses FH1, FH2 23AG fuse clip
Heat Sink
HS1 1 Heat sink for Q1 Aavid 513201
Heat Sink HS2 1Heat sink for D1 Aavid 579302 B 0 00 00
Inductors L1 1 1 mH, 5.5 A, 20:1 TR Cooper Electronic
Technologies CTX08–13679–02
MOSFETs Q1 1 International Rectifier IRFP450
R1 1 12.1 kΩ, 1/4 W
R3 1 20 kΩ
R4 1 249 kΩ
R5, R11 210 kΩ
R6 1 30.1 kΩ
R7 1 100 kΩ
Resistors R8 112.1 kΩ
Resistors
R9, R10 24.02 kΩ
R12 1 2 kΩ
R13, R21 2383 kΩ
R14 1 0.25 Ω, 3 W
R15, R18 224 kΩ, 1W, metal oxide/metal film Panasonic ERG 1S G 243
R16 1 100 Ω

SLUU077C –September 2000 –Revised November 2002
7
UCC3817 BiCMOS Power Factor Preregulator
Reference Qty DESCRIPTION Manufacturer Part Number
R17 1 20 Ω
R18 1 24 kΩ, 1W, metal oxide/metal film ERX 1S G 243
Resistors R2, R19 2499 kΩ
Resistors
R20 1 274k
R22 1 Zero Ohm jumper or 26AWG wire
Integrated
Curcuit U1 1 UCC3817N Texas Instruments UCC3817N
Sockets X @ U1 116 pin DIP socket
Board PCB 1 UCC3817 BARE PC BOARD
X1 @ Q1 1Thermal Pad Silicone TO220
Hardware X2 @ HS1 1Screw Pan Hd #6–32 X 3/8
Hardware
X3 @ HS1 1Nut #6X32
NOTE: Unless otherwise specified, all resistors are 0.25 W metal film with a 1% tolerance.
5 Typical Performance
75 25 50 75 100 125 150 175 200 225 250
85
80
90
100
95
Efficiency (%)
POUT –Output Power –W
VIN = 85 V
VIN = 265 V
VIN = 175 V
EFFICIENCY vs. OUTPUT POWER
Figure 3.

SLUU077C –September 2000 –Revised November 2002
8UCC3817 BiCMOS Power Factor Preregulator
0.4
0.5
0.6
0.7
0.8
0.9
1.0
1.1
25 50 75 100 125 150 175 200 225 250
Power Factor
POUT –Output Power –W
VIN = 265 V
VIN = 175 V
VIN = 85 V
POWER FACTOR
vs.
OUTPUT POWER
Figure 4.
6 Additional Information
For more information, pin description and specifications for the UCC3817 PFC Controller, please refer to the
UCC3817 datasheet, TI Literature Number SLUS395, or contact the Texas Instruments Semiconductor Product
Information Center at 1–800–336–5236 or 1–972–644–5580. Product information can also be found on the at
http://www.ti.com.
This evaluation module can also be used to evaluate the performance of the UCC3818 PFC control IC by
removing R16 and applying the bias voltage to the VCC pin through a separate bias supply.

SLUU077C –September 2000 –Revised November 2002
9
UCC3817 BiCMOS Power Factor Preregulator
DYNAMIC WARNINGS AND RESTRICTIONS
It is important to operate this EVM within the input voltage range of 85 V to 265 V ac and the output voltage of
385 V +/–10%.
Exceeding the specified input range may cause unexpected operation and/or irreversible damage to the EVM.
If there are questions concerning the input range, please contact a TI field representative prior to connecting
the input power.
Applying loads outside of the specified output range may result in unintended operation and/or possible
permanent damage to the EVM. Please consult the EVM User’s Guide prior to connecting any load to the EVM
output. If there is uncertainty as to the load specification, please contact a TI field representative.
During normal operation, some circuit components may have case temperatures greater than 50°C. The EVM
is designed to operate properly with certain components above 50°C as long as the input and output ranges are
maintained. These components include but are not limited to linear regulators, switching transistors, pass
transistors, and current sense resistors. These types of devices can be identified using the EVM schematic
located in the EVM User’s Guide. When placing measurement probes near these devices during operation,
please be aware that these devices may be very warm to the touch.
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Texas Instruments
Post Office Box 655303
Dallas, Texas 75265
Copyright 2001, Texas Instruments Incorporated

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Post Office Box 655303
Dallas, Texas 75265
Copyright 2002, Texas Instruments Incorporated