UCC3961/UCC38C43 Reference Design (PR127A) SLUU142 March 2003

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UCC3961/UCC38C43 Reference Design (PR127A) SLUU142 March 2003

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UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
UCC3961/UCC38C43 Reference Design (PR127A)
John Bottrill Contents Introduction Caution Schematic Reference Design Layout Electrical Characteristics Operation Reference Design Performance List Materials Power Supply Control Products
Introduction
following reference design 50-W synchronous rectified forward converter using UCC3961 Advanced Primary Side Start Controller primary side startup, driver UCC38C43 regulating controller that takes over after startup. design controls forward synchronous rectified topology which generates 15-A current module designed operate over range 42-V 58-V provides 3.3-VDC regulated output.
Caution
High-voltage levels present evaluation module whenever energized. Proper precautions must taken when working with this power module. Serious injury occur proper safety precautions followed.
UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
Schematic
UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
Reference Design Layout
Electrical Characteristics
3.30 3.37 none UNIT
VOUT Output power Turn-on overshoot Efficiency nominal load Efficiency nominal VIN(max) load
3.23
Operation
reference model described this document operates from input. start converter voltage applied inputs (J1, positive negative Output voltage will appear (pin positive, negative). unit should shut down then power immediately reapplied unit start. voltage primary side must discharged before restart enabled. This also true event momentary fault shutting unit down. primary side voltage must applied monotonic manner during startup. voltage should during startup, unit latch until voltage dropped restart performed.
UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
Reference Design Performance
following figures show reference designs performance.
EFFICIENCY LOAD
1.00 3.40
OUTPUT VOLTAGE OUTPUT POWER
0.95 VOUT Output Voltage
0.90 Efficiency
3.35
0.85 0.75
0.80
0.70 Load
3.30 POUT Output Power
Figure
Figure
OUTPUT VOLTAGE STARTUP TRAJECTORY
GAIN/PHASE FREQUENCY
Phase Gain
V/div
-100 -150 Frequency
Time µs/div
Figure
Figure
UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
List Materials
Table below lists components configured corresponding schematic shown Figure Part types manufacturers modified according specific application requirements. Table List Materials
REFERENCE Capacitor, AlEl, C_FC-K21 Capacitor, AlEl, CAP_ALUM_FC-D Capacitor, chip, 0.01 10%, X7R, C0805 Capacitor, chip, 0.22 10%, X7R, C0805 Capacitor, chip, 10%, X7R, C0805 Capacitor, chip, 10%, X7R, C0805 Capacitor, chip, X7R, C0805 Capacitor, chip, 10%, X5R, C1206 Capacitor, chip, 10%, X7R, C1206 Capacitor, chip, 2700 10%, X7R, C0805 Capacitor, chip, 1500 10%, X7R, C0805 Capacitor, chip, 3300 10%, X7R, C0805 Capacitor, chip, 0.022 10%, X7R, C0805 Capacitor, chip, 4700 10%, X7R, C0805 Capacitor, chip, 2200 10%, X7R, C0805 Capacitor, OsCon, CAP_RV10 Capacitor, chip, 0.015 10%, X7R, C0805 Capacitor, chip, 47000 10%, X7R, C1206 Capacitor, chip, 0.01 10%, X7R, C0805 Diode, 403A Diode, SOT-23 Diode, Zener, SOT-23 Connector, screw term, TB_2x3.5MM Connector, screw term, TB_2x5.1MM Inductor, IND_UP4B Inductor, 3200 MOSFET, 0.18 SMD-220 MOSFET, N-channel depl, 450V, 20ohms, TO-92 MOSFET, N-channel, SO-8 populated Bipolar PNP, SOT-23 Bipolar NPN, SOT-23 Zetex Zetex FMMT2907ACT-ND FMMT3904CT-ND DESCRIPTION MANUFACTURER Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Panasonic Sanyo Panasonic Panasonic Panasonic Digikey(DI) Digikey(ZX) Digikey Altech Altech Coiltronics Toko International Rectifier Supertex Inc. International Rectifier EEV-FC1J471N ECE-V1EA470UP ECJ-2VB1H103K ECJ-2YB1E224K ECJ-2VB1E104K ECJ-2VB2A471K ECJ-2VB2A331K ECJ-3YB1C225K ECJ-3YB1E105K ECJ-2VB1H272K ECJ-2VB1H152K ECJ-2VB1H332K ECJ-2VB1H223K ECJ-2VB1H472K ECJ-2VB1H222K 6SV470M ECJ-2VB1H153K ECJ-3YB2A473K ECJ-2VB2A103K ES2DDICT-ND BAR74ZXCT-ND BZX84C15DICT-ND AK550/2wp AK500/2wp HC2-2R2 875FU-332M IRF640NS DN3545N3 IRF7463 PART NUMBER
C21, C15, C10, C19,
UCC3961/UCC38C43 Reference Design (PR127A)
SLUU142 March 2003
REFERENCE R26, R27, R16, R17, R34, R15, R19, R20, R24, (See Note) (See Note) TP1-TP11 NOTE: either DESCRIPTION Resistor, chip, 32.4 0.125 R1206 Resistor, chip, R0805 Resistor, chip, R0805 Resistor, chip, R2512 Resistor, chip, 76.8 R0805 Resistor, chip, 0.25 R1210 Resistor, chip, R0805 Resistor, chip, 0.25 R1210 Resistor, chip, R0805 Resistor, chip, 46.4 R0805 Resistor, chip, R0805 Resistor, chip, R0805 Resistor, chip, 5.62 R0805 Resistor, chip, R0805 Resistor, chip, 7.50 R0805 Resistor, chip, R0805 Resistor, chip, R2512 Resistor, chip, R0805 Resistor, chip, R0805 Resistor, chip, R0805 Resistor, chip, R2010 populated, Resistor, chip, R0805 Resistor, chip, R0805 Resistor, chip, R0805 Transformer, power, windings, XFMR_EPC25 Transformer, pulse, windings Transformer, pulse, windings Testpoints, TP_FARNELL_1MM primary startup, SO14 BiCMOS controller, MOSFET driver, Century Mag. Pulse Pulse Keystone 2444 PA0128 PA-0115 5012 UCC3961D UCC38C43D TPS2832D MANUFACTURER PART NUMBER
UCC3961/UCC38C43 Reference Design (PR127A)
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