Texas Instruments UCC3580EVM Manual de usuario

User Guide

UCC3580EVM Flyback Converters,

Active Clamp vs Hard-Switched

Evaluation Board and List of

Materials

User’s Guide

EVM IMPORTANT NOTICE

Texas Instruments (TI) provides the enclosed product(s) under the following conditions:

This evaluation kit being sold by TI is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION

PURPOSES ONLY and is not considered by TI to be fit for commercial use. As such, the goods being provided

may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective

considerations, including product safety measures typically found in the end product incorporating the goods.

As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic

compatibility and therefore may not meet the technical requirements of the directive.

Should this evaluation kit not meet the specifications indicated in the EVM User’s Guide, the kit may be returned

within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE

WARRANTY MADE BY SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED,

IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY

PARTICULAR PURPOSE.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user

indemnifies TI from all claims arising from the handling or use of the goods. Please be aware that the products

received may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). Due to the open construction

of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic

discharge.

EXCEPT TO THE EXTENT OF THE INDEMNITY SET FORTH ABOVE, NEITHER PARTY SHALL BE LIABLE

TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

TI currently deals with a variety of customers for products, and therefore our arrangement with the user is not

exclusive.

TI assumes no liability for applications assistance, customer product design, software performance, or

infringement of patents or services described herein.

Please read the EVM User’s Guide and, specifically, the EVM Warnings and Restrictions notice in the EVM

User’s Guide prior to handling the product. This notice contains important safety information about temperatures

and voltages. For further safety concerns, please contact the TI application engineer.

Persons handling the product must have electronics training and observe good laboratory practice standards.

No license is granted under any patent right or other intellectual property right of TI covering or relating to any

machine, process, or combination in which such TI products or services might be or are used.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

EVM WARNINGS AND RESTRICTIONS

It is important to operate this EVM within the input voltage range of 0 VAC to 135 VAC and the output voltage

of 0 VDC to 14 VDC.

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 60°C. The EVM

is designed to operate properly with certain components above 125°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.

Mailing Address:

Texas Instruments

Post Office Box 655303

Dallas, Texas 75265

SLUU085 –November 2001

4UCC3580EVM

UCC3580EVM

Flyback Converters, Active Clamp vs Hard-Switched

Evaluation Board and List of Materials

Power Supply Control Products

Contents

1 Introduction 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Features 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Description 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.1 Operating Guidelines 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.2 Added Features 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3.3 Re-Configuration Instructions 6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4 Test Setup and Test Points 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5 Application Drawings and Parts List 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.1 Active Clamp Configuration 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5.2 Hard-Switched Configuration 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6 Traces and Silkscreen 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.1 Traces 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6.2 Silkscreen 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

7 Reference 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Figures

1Recommended Test Setup for the UCC3580 Flyback Evaluation Board 7. . . . . . . . . . . . . . . . . . . . . . . . .

2Flyback Converter Populated for Active Clamp Operation 8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3Flyback Converter Populated for Hard-Switched Operation 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4UCC3580EVM Layout, Top Traces 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

5UCC3580EVM Layout, Bottom Traces 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

6UCC3580EVM Silk Screen (only top layer has a silk screen) 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Tables

1List of Test Points 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2Parts List for Active Clamp Configuration 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3Conversion From Active Clamp to Hard-Switched Configuration: Remove List 12. . . . . . . . . . . . . . . . .

4Conversion From Active Clamp to Hard-Switched Configuration: Add List 12. . . . . . . . . . . . . . . . . . . .

SLUU085 –November 2001

UCC3580EVM

1 Introduction

This user’s guide describes the UCC3580EVM flyback converter evaluation board for comparing an

active-clamp configuration with a hard-switched configuration. The UCC3580EVM is originally configured as

an active-clamp flyback converter. Instructions and parts list are included in order to reconfigure the

UCC3580EVM as a hard-switched flyback converter. Both configurations use the UCC3580 PWM controller.

The active clamp configuration operates noticeably more efficiently than the hard switched configuration. Most

of the efficiency differences will be seen in the primary-side components.

2 Features

DProvides auxiliary-switch activation complementary to main-power switch drive

DProgrammable dead time (turnon delay) between activation of each switch

DVoltage mode control with feedforward operation

DProgrammable limits for both transformer volt-second product and PWM duty cycle

DHigh-current gate driver for both main and auxiliary outputs

DMultiple protection features with latched shutdown and soft restart

DLow supply current (160-µA startup, 2.5-mA operation)

3 Description

3.1 Operating Guidelines

WARNING:

DANGER: HIGH VOLTAGE! This evaluation board is intended for professional use

only. It has exposed high voltages. Do not operate this board without proper

isolation and high-voltage/high-current safety practices.

Refer to the recommended test setup, as shown in Figure 1, and the test points in Table 1. Connect the

UCC3580EVM, configured for either active clamp operation or hard-switched operation, as shown in Figure 1.

Close the ac line switch and verify that the UCC3580EVM is operating correctly (12 V should be measured by

the hand-held DVM on the converter output). Using the appropriate oscilloscope probes, observe the main

transistor drain source voltage (TP14 to TP13) and the cathode to anode voltage of the output rectifier (TP6 to

TP8). The active clamp implementation will have crisp, clamped voltages and no overshoot on the output

rectifier. Converter dynamics can be observed [1] using TP3, 4 and 5.

Other test points are included to observe voltages and currents that are of interest for a specific application.

Table 1 describes the intended purpose of the test points that are installed in the board and how they should

be used.

SLUU085 –November 2001

6UCC3580EVM

3.2 Added Features

Flyback converters require a voltage clamp in order to limit the main switch voltage at turnoff. The effect is due

to energy that is stored in the primary leakage inductance of the power transformer. Older hard-switched

technology captures the excess leakage inductance energy at turnoff and merely dissipates it in a resistor. In

contrast, the active clamp uses the leakage inductance energy to facilitate zero voltage transitions. Efficient ZVS

transitions occur at turnon of both the main MOSFET and the auxiliary MOSFET.

Active-clamp technology is made possible here with the UCC3580 single ended active clamp/reset PWM

controller. Essentially, this controller is a voltage mode PWM controller with complementary outputs and

programmable delay between output transitions. The controller also includes over-current protection,

volt-seconds protection and a soft-start feature. The programmable delay is set to be long enough for the

leakage inductance energy to forward bias the power MOSFETs before their respective turnon, thus achieving

zero voltage switching.

The schematic for the active clamp configuration is shown in Figure 2 and its parts list is in Table 2. The

schematic for the hard-switched configuration is shown in Figure 3. Both configurations operate with the same

input voltage (110 VAC + 10%) and produce the same output voltage (12 V) and current (10 A). Heat sink HS1

is selected to accommodate the hard-switched configuration and it is thus over-sized for active clamp operation.

The thermal resistance of HS1 is 6.5°C/W, which is required for hard-switched operation. In contrast, heat sink

HS1 only needs a thermal resistance of 10°C/W for active-clamp operation, which was verified in the laboratory.

Thus transistor QM operates more efficiently, and it requires a smaller heat sink in the active-clamp

configuration. Also, notice that the active-clamp configuration does not require secondary rectifier snubber

components (R31 and C30). These features are the result of efficient active clamp technology.

For more information, pin descriptions and specifications for the UCC3580 single ended active clamp/reset

PWM, please refer to the UCC3580 data sheet.

3.3 Re-Configuration Instructions

WARNING:

Danger: Remove power from the UCC3580EVM before removing or installing

components.

These instructions describe how to reconfigure the UCC3580EVM from the active clamp configuration to the

hard switched configuration. This section requires components, de-soldering, soldering, and assembly

equipment and skills. The components are listed in Table 4.

Begin with an UCC3580EVM in the active-clamp configuration (original configuration). Refer to Table 3 and

Table 4 for the components to remove and add, respectively in order for the UCC3580EVM to match the

schematic in Figure 3. The additional components in Table 4 are supplied in the kit that is included with the

UCC3580EVM.

De-solder the components listed in Table 3. Solder the components listed in Table 4.

Conversion is now complete and comparisons can be made using the test setup in Figure 1 and the test points

in Table 1.

SLUU085 –November 2001

UCC3580EVM

4 Test Setup and Test Points

LINE

HIGH

NEUTRAL

ISOLATION

TRANSFORMER

1:1

VARIAC

SAFETY

GROUND

1.2 Ω, minimum

120 Watts

10 Amps

Oscilloscope

Tektronix

TDS460A

Tektronix

P5205

100MHz

High Voltage

Differential

Probe

+–Tektronix

P5100 100X

Probe,

2500V,peak

Tektronix

P6138A

10X Probe,

300V,peak

1 2 3

NOTES:

Warning, High Voltage!

This test setup is connected to the ac

line, observe isolation requirements.

Use the P5202 for all differential observations,

both high and low voltage.

Use the P5100 for all voltage observations that

are more than 200V and ground referenced.

Use the P6138A for all voltage observations

that are less than 200V and ground

referenced.

J1–1

Chassis

J1–2

Neutral

J1–3

Line

J2–2

GND2

J2–1

+12V

Demonstration

Hand–Held DVM

+–

UCC3580EVM

Figure 1. Recommended Test Setup for the UCC3580EVM

Table 1. List of Test Points

Test Point Signal Name Voltage Range GND REF Measurement

TP1 GND2 SEC Secondary ground

TP2 12 V 12 V SEC 12 V, observe relative to TP1

TP3

TP4

TP5

12 V, 0.1 VAC SEC Injection and observation points for control loop. Refer to [1]

TP6

TP7

TP8

12 V

50 V

SEC Differentially observe V(D17) between TP6 and TP8.

Differentially observe snubber power between TP6 and TP7.

TP9 PRI GND PRI Primary ground for controller observations

TP10 OUT1 12 V PRI Main MOSFET (QM) gate control signal

TP11 OUT2 12 V PRI Auxiliary MOSFET (QA) gate control signal

TP12 EAOUT 5 V PRI Error amplifier output to PWM comparator

TP13 PRI GND PRI PRI GND reference for QM and CSENSE observations

TP14 DRAIN 300 V PRI Observe QM drain voltage relative to PRI GND

TP15 CSENSE 1 V PRI Observe drain current of QM

TP16

TP17

TP18

SOURCE

BULK

DRAIN

300 V

PRI Differentially observe QA drain–source voltage between TP18 and

TP16

Differentially observe clamp voltage, V(C25) between TP18 and TP17

TP19

TP20 PRI GND

BULK 200 V PRI Observe bulk capacitor voltage ( the dc input voltage to the converter)

SLUU085 –November 2001

8UCC3580EVM

5 Application Drawings and Parts List

5.1 Active Clamp Configuration

UDG–00014

3.92k R6

5.62k

C14

1µF

50V

IC1

UCC3580–4

DELAY

LINE

VDD

OUT1

PGND

OUT2

CLK

GND

SHDN

REF

EAIN

EAOUT

OSC1

OSC2

RAMP

680pF C8

470pF

33.2k

R14

33.2k

R13

1.62k

TP12

EAOUT

C17

0.047µF

R17

130k R10

20.0k C12

0.01µF

R11 511k

R16

3.32k

D11

1N5819

C18

2200pF

R21 1k

240k

C10

330pF

500V

1N5819

C15

0.1µFR4 47k

2N3904

R19

15 D9

1N5819

2N3906

R18

4.7k

R12

10k

IRF740

HS1

R24

0.10

M.E.

TP15

CSENSE

TP14

DRAIN

L3 16µH

2 4

D16

MUR460

TP9

PRI GND

C19

100µFD14

1N4744

R22 20

C24

0.1µF

D15

MUR120 3

3 TURNS

C21

0.1µF

400V

R23

10k

R15

4.7k

2N3904

2N3906

D10 1N4148

TP11

OUT2

1N4148

0.1µF

R5 30

C11 0.1µF

TP10

OUT1

TP16

SOURCE

TP18

DRAIN

C25

0.068µF

400V

TP17

BULK 24

TURNS

158µH

TP20

BULK

1000µF

TP19

TPI GND

68k

1N5406

4700pF

250V

4700pF

250V

J1–1

CHASSIS

C4 0.1µF

250V

C5 0.1µF

250V

18µH

470k

C3 0.1µF

250V

J1–3

LINE J1–2

NEUTRAL

3 TURNS

C34

180µFC33

180µF

C32

180µFC31

180µF

++++

R31

NOT

USED

HS3

D17

MBRF2545CT

C30

NOT

USED

TP8

ANODE TP6

CATHODE

TP7

SNUB

TP12

+12V

TP1

GND2

TP4

TP5

R32

C29

470pF

R29

3.01k

R27

60.4k C28

4.7nF

R30

54.9k

C26

220pF

IC3

TL431 R28

14.3k

C27

1.0nF 250VAC

TP3

J2–2

RETURN

J2–1

+12V

IC2

CNY17–2

AC INPUT

115V

60Hz

CAUTION:

LINE VOLTAGE

PRIMARY SECONDARY

2mH

IRF740

HS2

D13 1N4148

TP13

PRI GND

R26

3.01k

TH1

HIGH

TEMPERATURE–

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH

TEMPERATURE–

SEE EVM WARNINGS

AND RESTRICTIONS

HIGH

TEMPERATURE–

SEE EVM WARNINGS

AND RESTRICTIONS

Note: High-temperature component. See EVM Warnings and Restrictions at the front of this document.

Figure 2. Flyback Converter Populated for Active Clamp Operation

SLUU085 –November 2001

UCC3580EVM

Table 2. Parts List for Active Clamp Configuration

Ref Des Qty Description MFG Size Part Number

C1,2 2 Y Cap, 4700 pF, 250 Vac Sprague 6.5 mm 5GAD47

C3 –C5 3X Film Cap, 0.1 µF, 250 Vac Philips 15 mm 222 330 40104

C6, C11,

C15, C24 4Ceramic, 0.1 µF, 50 V Panasonic 5 mm ECU–S1H104KBB

C7 1 Aluminum electrolytic, 1000 µF,

200 V United Chemi–con 10 mm KMH200VN102M35X35

C8 1 Ceramic, 470 pF, 50 V Panasonic 2.5 mm ECU–S1H471JCA

C9 1 Ceramic, 680 pF, 50 V Panasonic 2.5 mm ECK–F1H681KB

C10 1 Ceramic Disk, 330 pF, 500 V Philips 5 mm D331K20Y5PLAAEU

C12 1 Ceramic, 0.01 µF, 50 V Panasonic 2.5 mm ECU–S1H103KBA

acitor

C14 1 Ceramic, 1 µF, 50 V Panasonic 5 mm ECU–S1H105MEB

apac

or C17 1Ceramic, 47 nF, 50 V Panasonic 2.5 mm ECU–S1H473MEA

C18 1 Ceramic, 2200 pF, 50 V Panasonic 2.5 mm ECK–F1H222KB

C19 1 Aluminum Electrolytic, 100 µF, 25 V Panasonic 2 mm ECE–A1EU101

C21 1 Foil, 0.1 µF, 400 V Panasonic 20 mm ECQ–P4104JU

C25 1 Foil, 0.068 µF, 400 V Panasonic 20 mm ECQ–P4683JU

C26 1 Ceramic, 220 pF, 50 V Panasonic 2.5 mm ECU–S1H221JCA

C27 1 Y1 Ceramic, 1000 pF, 250 Vac Panasonic 10 mm ECK–DNA102MB

C28 1 Ceramic, 4.7 nF, 50 V Panasonic 2.5 mm ECU–S1H472KBA

C29 1 Ceramic, 470 pF, 50 V Panasonic 7.5 mm ECU–S1H471JCA

C31 –C34 4Os–Con, 180 µF, 20 V Sanyo 5 mm 20SP180M

D1 –D4 4General Purpose, 3 A, 600 V DO–201AD 1N5406

D5, D10,

D13 3Switching, 75 mA, 75 V DO–35 1N4148

Diode

D6, D7,

D9, D11 4Schottky, 1 A, 40 V DO–41 1N5819

eD14 1Zener, 15 V, 1 W DO–41 1N4744A

D15 1 Ultra Fast, 1 A, 200 V DO–41 MUR120

D16 1 Ultra Fast, 4 A, 400 V DO–201AD MUR460

D17 1 Schottky, Dual, 25 A, 45 V ITO–220AB MBRF2545CT

Fuse F1 1 3 A, AGC3A Buss, 3 A Buss 31.75 mm AGC3A

Fuse clips FCa,b 2 2 required, spacing per dwg Keystone 7.62 mm 3510

HS1 1 For QM, 6.5 C/W Thermalloy 50.44 mm 7022B–MT

Heatsink HS2 1For QA, 13 C/W Thermalloy 24.38 mm 6021PB

Heatsink

HS3 1 For D53, 4.4 C/W Thermalloy 27.94 mm 7023B–MT

PWM IC1 1 IC control TI–Unitrode DIL–16 UCC3580N–4

Optocoupler IC2 1 CNY17–2 DIL–6 CNY17–2

Voltage

Reference IC3 1 2.495 V TI TO–226AA TL431CLP

Connector J2 1 2 pos, 5.08 mm spacing Phoenix Contact 5.08 mm 1730612

L1 1 Toroid, 18 µH Magnetek 12.06 mm FIT68–7

Choke L2 1Common mode, 2 mH Panasonic 10X16.5 mm ELF–18N032A

Choke

L3 1 E25/10/6–3F3 core, 10-pins, 16 µHCentury Magnetics 5.1X15.6 mm CMI–2408

MOSFET QA, QM 2400 V, 0.55 Ω, 10 A IR TO–220AB IRF740

SLUU085 –November 2001

10 UCC3580EVM

Ref Des Qty Description MFG Size Part Number

Screw 3 #4–40 x 3/8”round head, philips, for QA, QM & D17

Nut 3#4–40 hex for QA, QM & D17

Washer 3#4, flat for QA, QM & D17

Washer 3#4, split lock, for QA, QM & D17

Heat sink pad 2TO220, for QA, QM Bergquist 3.18 mm

hole SP600–58

Shoulder

washer 2Hi temp plastic, for QA, QM & D17 Bivar for #4 screw SW–031–145

Tit

Q1, Q4 2PNP, 40 V, 200 mA TO–226AA 2N3906

Transistor Q2, Q3 2NPN, 40 V, 200 mA TO–226AA 2N3904

R1 1 1 W, Metal Oxide, 68 kΩ, 5% Panasonic 20 mm P68kW–1BK–ND

R2 1 1/4 W, carbon comp, 470 kΩ, 5% Multicomp 15.24 mm RC1/4G474JT

R3 1 1 W, Metal Oxide, 240 kΩ, 5% Panasonic 20 mm P240kW–1BK–ND

R4 1 2 W, 47 kΩ, 5% Panasonic 25.4 mm P47kW–2BK–ND

R5 1 1/4 W, 30 Ω, 5% 10.16 mm

R6 1 1/4 W, 5.62 kΩ, 1% 10.16 mm

R7 1 1/4 W, 3.92 kΩ, 1% 10.16 mm

R8 1 1/4 W, 33.2 kΩ, 1% 10.16 mm

R10 1 1/4 W, 20.0 kΩ, 1% 10.16 mm

R11 1 1/4 W, 511 kΩ, 1% 10.16 mm

R12, R23 21/4 W, 10 kΩ, 5% 10.16 mm

R13 1 1/4 W, 1.62 kΩ, 1% 10.16 mm

Resistor R14 11/4 W, 33.2 kΩ, 1% 10.16 mm

Resistor

R15 1 1/4 W, 4.7 kΩ, 5% 10.16 mm

R16 1 1/4 W, 3.32 kΩ, 1% 10.16 mm

R17 1 1/4 W, 130 kΩ, 1% 10.16 mm

R18 1 1/4 W, 4.7 kΩ, 5% 10.16 mm

R19 1 1/4 W, 15 Ω, 5% 10.16 mm

R21 1 1/4 W, 1 kΩ, 1% 10.16 mm

R22, R32 21/4 W, 20 Ω, 5% 10.16 mm

R24 1 3 W, Metal Element, 0.1 Ω, 1% IRC 20 mm LOB–3–0.10 Ω

R26, R29 21/4 W, 3.01 kΩ, 1% 10.16 mm

R27 1 1/4 W, 60.4 kΩ, 1% 10.16 mm

R28 1 1/4 W, 14.3 kΩ, 1% 10.16 mm

R30 1 1/4 W, 54.9 kΩ, 1% 10.16 mm

T1 1 Gate drive, 8-pins Coiltronics 2.5X8 mm CTX08–14086–X1

Transformer T2 1PC40EER35 core, 12-pins,

158 µH pri, 24:3 Century Magnetics 5X22.5 mm CMI–2409

Thermistor TH1 1 Jumper, insulated, 20AWG 10.16 mm

Test Point TP1 to

TP20 20 White, 0.063 inch dia. Keystone 1.6 mm 5012

Jumper W1 1 2 holes 7.62 mm

Support Post 4Nylon, in PWB corner holes Richco 156”hole,

15.9 mm SP3–10–01

PCB –– 12-Layer, 2 oz, 9.00”(L) x 6.00”(W) x 0.062”(T) SLUP054

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