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UC1854B UC2854A, UC2854B UC3854A, UC3854B
ADVANCED HIGH POWER FACTOR PREREGULATOR
FEATURES Controls Boost Near-Unity Power
Factor Limits Line Current Distortion World-Wide Operation Without Switches Accurate Power Limiting Fixed-Frequency Average Current-Mode Control High Bandwidth MHz), Low-Offset Current Amplifier Integrated Current- Voltage Amplifier Output Clamps Multiplier Improvements: Linearity, Offset (Eliminates External Resistor), Multout Common-Mode Range VREF GOOD Comparator Faster Improved Accuracy ENABLE Comparator UVLO Options V/10 10.5 V/10 300-µA Start-Up Supply Current
10.5 2.65 2.15 VSENSE VRMS MOUT MOUT
DESCRIPTION
UC3854A/B products compatible enhanced versions UC3854. Like UC3854, these products provide functions necessary active power factor corrected preregulators. controller achieves near unity power factor shaping input line current waveform correspond input line voltage. this UC3854A/B uses average current mode control. Average current mode control maintains stable, distortion sinusoidal line current without need slope compensation, unlike peak current mode control. reference, fixed frequency oscillator, PWM, voltage amplifier with soft-start, line voltage feedforward (VRMS squarer), input supply voltage clamp, over current comparator round list features. Available 16-pin (PDIP), (SOICWide), (CDIP) 20-pin (PLCC) package. ordering information page availability temperature range.
PKLMT POWER
BLOCK DIAGRAM
GTDRV
ISENSE
RSET
UDG-03110
PRODUCTION DATA information current publication date. Products conform specifications terms Texas Instruments standard warranty. Production processing does necessarily include testing parameters.
Copyright 2003, Texas Instruments Incorporated
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
DESCRIPTION (continued)
UC3854A/B products improve upon UC3854 offering wide bandwidth, offset current amplifier, faster responding improved accuracy enable comparator, VREF GOOD comparator, UVLO threshold options V/10 offline, 10.5 V/10 startup from auxiliary regulator), lower startup supply current, enhanced multiply/divide circuit. features like amplifier output clamps, improved amplifier current sinking capability, offset reduce external component count while improving performance. Improved common mode input range multiplier output/current amplifier input allow designer greater flexibility choosing method current sensing. Unlike predecessor, RSET controls only oscillator charging current effect clamping maximum multiplier output current. This current clamped maximum times which simplifies design process provides foldback power limiting during brownout extreme line conditions.
These devices have limited built-in protection. leads should shorted together device placed conductive foam during storage handling prevent electrostatic damage gates.
ABSOLUTE MAXIMUM RATINGS
over operating free-air temperature range unless otherwise noted(1) UCX854A, UCX854B Supply voltage, GTDRV current, IGTDRV GTDRV Current, IGTDRV Input voltage Input current Power dissipation Junction temperature, Storage temperature, Tstg Continuous duty cycle VSENSE, VRMS, ISENSE MOUT PKLMT RSET, IAC, PKLMT, UNIT
Lead temperature, Tsol, (1/16 inch) from case seconds Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. voltages with respect GND. Currents positive into negative specified terminal. input internally clamped approximately
RECOMMENDED OPERATING CONDITIONS
Supply voltage, UC1854X Operating junction temperature, UC2854X UC3854X UNIT
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
PACKAGE DESCRIPTION
PACKAGES (TOP VIEW) PACKAGE (TOP VIEW)
PKLMT ISENSE MOUT VRMS
GTDRV RSET VSENSE VREF
PKLMT GTDRV
ISENSE CAOUT MOUT
RSET VSENSE
connection
ORDERING INFORMATION
UVLO TURN-ON -55°C 125°C -40°C 85°C 70°C 10.5 10.5 10.5 UVLO TURN-OFF PART NUMBERS CDIP-16 UC1854BJ UC2854AJ UC2854BJ PDIP-16 UC2854AN UC2854BN UC3854AN UC3854BN SOIC-16 (DW) UC2854ADW UC2854BDW UC3854ADW UC3854BDW PLCC-20 UC2854AQ UC2854BQ
packages available taped reeled. suffix device type (e.g. UC2854ADWTR) order quantities 2,000 devices reel package 1,000 devices reel package.
THERMAL RESISTANCE
PACKAGED DEVICES RESISTANCES (°C/W) (°C/W) CDIP-16 28(2) 80-120 PDIP-16 90(3) SOP-16 (DW) 50-130(3) PLCC-20 43-75(3)
data values stated derived from MIL-STD-1835B which states "the baseline values shown worst case (mean +2s) microcircuit device silicon applicable devices with sizes 14,400 square mils. device sizes greater than 14,400 square mils following values, dual-in-line, 11°C/W; flat pack grid array, 10°C/W. (junction-to-ambient) applies devices mounted five square inch board with ounce copper where noted. When resitance range given, lower values five square inch aluminum board. Test 0.062 inches thick typically uses 0.635 trace widths power packages trace widths non-power packages with probe land each trace.
VRMS VREF
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
ELECTRICAL CHARACTERISTICS
VPKLMT VVRMS IIAC IISENSE VCAO VVAO VVSENSE -40°C 85°C UC2854A UC2854B, <70°C UC3854A UC3854B, (unless otherwise noted) PARAMETER OVERALL Supply current, Supply current, UCx854A turn-on threshold voltage turn-off threshold voltage clamp VOLTAGE AMPLIFIER Input voltage VSENSE bias current Open loop gain High-level output voltage Low-level output voltage Output short-circuit current Gain bandwidth product(1) VOUT ILOAD -500 ILOAD VOUT kHz, VOUT ILOAD -500 ILOAD VOUT -0.3 kHz, mVP-P 7.35 7.50 7.65 mVP-P 25°C overtemperature -5.5 -500 -500 UCx854B IVCC IVCC(on) 15.0 VUVLO-0.3 16.0 10.5 17.5 11.2 TEST CONDITIONS UNIT
CURRENT AMPLIFIER Input offset voltage Input bias current, ISENSE Open loop gain CMRR High-level output voltage Low-level output voltage Output short-circuit current Common mode rejection range Gain bandwidth product(1)
REFERENCE Output voltage Load regulation Line regulation Short circuit current Ensured design. production tested. Gain constant.
IREF 25°C IREF IREF VREF
MOUT
VRMS
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
ELECTRICAL CHARACTERISTICS
VPKLMT VVRMS IIAC IISENSE VCAO VVAO VVSENSE -40°C 85°C UC2854A UC2854B, <70°C UC3854A UC3854B, (unless otherwise noted) PARAMETER OSCILLATOR Initial accuracy Voltage stability Total variation Ramp amplitude (peak-to-peak) Ramp valley voltage ENABLE/SOFT-START/CURRENT LIMIT Enable threshold voltage Enable hysteresis Enable input bias current Propagation delay disable time(1) Soft-start charge current Peak limit offset voltage Peak limit input current Peak limit propagation delay time(1) MULTIPLIER Output current, limited Output current, zero Output current, power limited RSET VRMS VRMS VRMS VRMS VRMS VRMS IOUT -200 IOUT IOUT IOUT CLOAD CLOAD CLOAD VRMS RSET 25°C -1.1 12.0 -220 -2.0 -230 -200 -0.2 -200 -156 -1.0 12.8 -0.9 -170 -170 VPKLMT -0.1 VFAULT VENA Enable overdrive -200 -100 2.35 2.55 2.80 25°C Line, temperature TEST CONDITIONS UNIT
Output current
Gain constant(2) GATE DRIVER High-level output voltage Low-level output voltage Low-level UVLO voltage Output rise time(1) Output fall time(1) Output peak current(1) Ensured design. production tested. Gain constant.
MOUT
VRMS
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
TERMINAL FUNCTIONS
TERMINAL PACKAGES NAME J/N/DW Output wide bandwidth current amplifier inputs duty-cycle comparator. output signal generated this amplifier commands force correct input current. output swing from Capacitor from sets oscillator frequency nominal voltage above 2.65 this allows device begin operating. Once operating, device shuts this goes below 2.15 nominal. bypass timing capacitors connected should have leads short direct possible. voltages measured with respect GND. Output 1.5-A peak totem-pole MOSFET gate driver GTDRV. This output internally clamped that device operated with high series gate resistor least prevent interaction between gate impedance GTDRV output driver that might cause GTDRV output overshoot excessively. Some overshoot GTDRV output always expected when driving capacitive load. Current input multiplier, proportional instantaneous line voltage. This input analog multiplier current. multiplier tailored very distortion from this current input (IAC) MOUT, this only multiplier input that should used sensing instantaneous line voltage. nominal voltage addition resistor from rectified connect resistor from VREF. resistor VREF one-fourth value resistor rectifier, then offset cancelled, line current minimal cross-over distortion. Switch current sensing input. This inverting input current amplifier. This input non-inverting input MOUT remain functional down below GND. Care should taken avoid taking these inputs below -0.5V, because they protected with diodes GND. Multiplier output current sense plus. output analog multiplier non-inverting input current amplifier connected together MOUT. cautions about taking ISENSE below -0.5V also apply MOUT. multiplier output current, this high-impedance input similar ISENSE, current amplifier configured differential amplifier reject noise. Peak limit. threshold PKLMT Connect this input negative voltage current sense resistor. resistor offset negative current sense signal GND. Oscillator charging current multiplier limit set. resistor from RSET ground programs oscillator charging current maximum multiplier output. Multiplier output current does exceed 3.75V divided resistor from RSET ground. Soft-start. remains long device disabled low. pulls over internal 14-mA current source when both becomes valid device enabled. acts reference input voltage amplifier below VREF. With large capacitor from GND, reference voltage regulating amplifier rises slowly, increase duty cycle slowly. event disable command supply dropout, will quickly discharge ground disable PWM. Voltage amplifier output Positive supply rail Used peak limit point internal reference various device functions. This voltage must present device operate. inputs into multiplier. This provides input voltage multiplier circuitry. This provides feedback from output. This input goes into voltage error amplifier output error amplifier another inputs into multiplier circuit. DESCRIPTION
GTDRV
ISENSE
MOUT
PKLMT RSET
VREF VRMS VSENSE
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
FUNCTIONAL DESCRIPTION
UC3854A UC3854B family products designed compatible upgrades industry standard UC3854 active power factor correction circuits. circuit enhancements allow user eliminate most cases several external components currently required successfully apply UC3854. addition, linearity improvements multiply, square divide circuitry optimizes overall system performance. Detailed descriptions circuit enhancements provided below. in-depth design applications reference data refer application notes, UC3854 Controlled Power Factor Correction Circuit Design (SLUA144) UC3854A UC3854B Advanced Power Factor Correction Control (SLUA177).
Multiply/Square Divide
UC3854A/B multiplier design maintains same gain constant (K=-1) UC3854. relationship between inputs output current given MOUT VRMS
This nearly same UC3854, circuit differences have improved performance application. first difference with input. UC3854A/B regulated this voltage nominal over full operating temperature range, rather than used UC3854. offset voltage eliminates need line zero crossing compensating resistor VREF from that UC3854 designs require. maximum current high line into should limited best performance. Therefore, VVAC(max) 1.414 1.53
VRMS linear operating range improved with UC3854A/B well. input range VRMS extends from Since UC3854A squaring circuit employs analog multiplier, rather than linear approximation, accuracy improved, discontinuities eliminated. external divider network connected VRMS should produce line VAC). This puts 4.77 VRMS high line VAC) which well within operating range. voltage amplifier output forms third input multiplier internally clamped This eliminated external zener clamp often used UC3854 designs. offset voltage this input multiplier been raised UC3854A/B multiplier output pin, which also common current amplifier non-inverting input, -0.3 output range, compared -0.3 range UC3854. This improvement allows UC3854A/B used applications where current sense signal amplitude very large.
Voltage Amplifier
UC3854A/B voltage amplifier design essentially similar UC3854 with exceptions. first with internal connection. lower voltage reduces amount charge compensation capacitors, which provides improved recovery form large signal events, such line dropouts, power interruption. also minimizes current flowing through feedback. output voltage amplifier also changes. addition temperature compensated clamp, output short circuit current been lowered typical, active pull down replaced passive pull down UC3854.
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
Current Amplifier
current amplifier average current controller needs offset voltage order minimize line current distortion. With this mind, UC3854A/B current amplifier improved input offset voltage from negative offset UC3854A/B guarantees that circuit will drive MOSFET current command zero (both current amplifier inputs zero.) Previous designs required external offset cancellation network implement this feature. bandwidth current amplifier been improved well typical. While this generally issue inputs, essential input avionics applications
Miscellaneous
Several other important enhancements have been implemented UC3854A/B. supply voltage clamp allows controller current desired. lower startup supply current (250 typical), substantially reduces power requirements offline startup resistor. 10.5 V/10 UVLO option (UC3854B) enables controller powered auxiliary supply. VREF GOOD comparator guarantees that MOSFET driver output remains supply reference This improvement eliminates need external Schottky diodes PKLMT Mult pins that some UC3854 designs require. propagation delay disable feature been improved typical. This delay proportional size VREF capacitor UC3854, typically several orders magnitude slower.
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
TYPICAL CHARACTERISTICS
GATE DRIVE TIMING LOAD CAPACITANCE
GATE DRIVE MAXIMUM DUTY CYCLE OSCILLATOR CHARGING RESISTANCE
Fall Time Time Rise Time 0.01 0.02 0.03 0.04 0.05 CLOAD Load Capacitance Duty Cycle
1000
RSET Oscillator Charging Resistance
Figure
MULTIPLIER GAIN CONSTANT SUPPLY CURRENT
1.16 Multiplier Gain Constant- 1.12 1.08 1.04 1.00 0.96 0.92 0.88 0.84 0.80 Supply Current VRMS VRMS VRMS 1.16 1.12 Multiplier Gain Constant- 1.08 1.04 1.00 0.96 0.92 0.88 0.84 0.80 VRMS
Figure
MULTIPLIER GAIN CONSTANT SUPPLY CURRENT
1.20
1.20
VRMS
VRMS
Supply Current
Figure
Figure
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UC1854B UC2854A, UC2854B UC3854A, UC3854B
Gain
CURRENT AMPLIFIER GAIN FREQUENCY
PHASE Phase Gain
VOLTAGE AMPLIFIER GAIN FREQUENCY
PHASE
Phase
GAIN 5.992
1000
GAIN
Frequency
Frequency
Figure
OSCILLATOR FREQUENCY LIMIT RESISTANCE TIMING CAPACITANCE
Figure
fOSC Oscillator Frequency
RSET Multiplier Limit Resistance
Figure
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