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NCP1654 Product Preview Power Factor Controller for Compact and Robust, Continuous Conduction Mode Pre-Converters
The NCP1654 is a controller for Continuous Conduction Mode (CCM) Power Factor Correction step-up pre-converters. It controls the power switch conduction time (PWM) in a fixed frequency mode and in dependence on the instantaneous coil current. Housed in a DIP8 or SO8 package, the circuit minimizes the number of external components and drastically simplifies the PFC implementation. It also integrates high safety protection features that make the NCP1654 a driver for robust and compact PFC stages like an effective input power runaway clamping circuitry.
Features
http://onsemi.com MARKING DIAGRAMS
8 PDIP-8 P SUFFIX CASE 626 1 SO-8 D SUFFIX CASE 751 1 NCP1654, N1654 = Device Code A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W = Work Week G or G = Pb-Free Package 1 8 8 1 N1654 ALYW G NCP1654 AWL YYWWG
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* * * * * * * * * * * * * * * * * * * * *
IEC1000-3-2 Compliant Average Current Continuous Conduction Mode Fast Transient Response Very Few External Components Very Low Startup Currents (<75 mA) Very Low Shutdown Currents (< 400 mA) Low Operating Consumption 1.5 A Totem Pole Gate Drive Accurate Fully Integrated 65 kHz Oscillator Latching PWM for cycle-by-cycle Duty-Cycle Control Internally Trimmed Internal Reference 2 versions of Undervoltage Lockout with Hysteresis Soft-Start for Smoothly Startup Operation (B version only) Shutdown Function Inrush Currents Detection Overvoltage Protection Undervoltage Detection for Open Loop Detection (shutdown) Brown-Out Detection Soft-Start Accurate Overcurrent Limitation True Overpower Limitation
PIN CONNECTIONS
Ground 1 VM 2 CS 3 Brown-Out 4 (Top View) 8 Driver 7 VCC 6 Feedback 5 Vcontrol
Safety Features
ORDERING INFORMATION
See detailed ordering and shipping information in the package dimensions section on page 8 of this data sheet.
Typical Applications
* TV, Monitors, PC Desktop SMPS * AC Adapters SMPS * White Goods, other Off-line SMPS
This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice.
(c) Semiconductor Components Industries, LLC, 2007
March, 2007 - Rev. P0
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Publication Order Number: NCP1654/D
NCP1654
Maximum Ratings Table
Symbol DRV VCC Vin Pin 8 7 7 2, 3, 4, 5, 6 Rating Output Drive Capability - Source Output Drive Capability - Sink Power Supply voltage, VCC pin, continuous voltage Transient Power Supply voltage, duration < 10 ms, IVCC < 10 mA Input Voltage Power Dissipation and Thermal Characteristics P suffix, Plastic Package, Case 626 Maximum Power Dissipation @ TA = 70C Thermal Resistance Junction-to-Air D suffix, Plastic Package, Case 751 Maximum Power Dissipation @ TA-=-70C Thermal Resistance Junction to Air Operating Junction Temperature Range Maximum Junction Temperature Storage Temperature Range Lead Temperature (Soldering, 10 s) Value -1.5 +1.5 -0.3, +20 +25 -0.3, +10 Unit A V V V
PD(DIP) RqJA(DIP) PD(SO) RqJA(SO) TJ TJmax TSmax TLmax
800 100 450 178 -40 to +125 150 -65 to +150 300
mW C/W mW C/W C C C C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. 1. This device series contains ESD protection and exceeds the following tests: Pins 1 - 8: Human Body Model 2000 V per MIL-STD-883, Method 3015. Pins 1 - 8: Machine Model Method 200 V (except pin#7 which complies 150 V) 2. This device contains Latch-up Protection and exceeds 100 mA per JEDEC Standard JESD78.
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NCP1654
Typical Electrical Characteristics Table (VCC = 15 V, TJ from -40C to +125C, unless otherwise specified) (Note 3)
Symbol GATE DRIVE SECTION Rsource Rsink Trise Tfall REGULATION BLOCK Vref IEA GEA IBpin6 Vcontrol Vcontrol(max) Vcontrol(min) DVcontrol VoutL / Vref HoutL / Vref IBOOST CURRENT SENSE BLOCK VS IS(OCP) POWER LIMITATION BLOCK ICS x Iin Over Power Limitation Threshold ICS(OPL1) ICS(OPL2) PWM BLOCK Dcycle OSCILLATOR / RAMP GENERATOR BLOCK Fsw BROWN-OUT DETECTION BLOCK VBOH VBOL IIB CURRENT MODULATION BLOCK IM1 IM2 IM3 IM4 Multiplier Output Current (Vcontrol = Vcontrol(max), VBO = 0.9 V, ICS = 25 mA Multiplier Output Current (Vcontrol = Vcontrol(max), VBO = 0.9 V, ICS = 75 mA Multiplier Output Current (Vcontrol = Vcontrol(min) + 0.2 V, VBO = 0.9 V, ICS = 25 mA Multiplier Output Current (Vcontrol = Vcontrol(min) + 0.2 V, VBO = 0.9 V, ICS = 75 mA 0.7 2.1 8.3 24.2 1.9 5.6 28.1 84.4 3.8 10.3 46.4 146 mA Brown-Out VoltageThreshold (rising) Brown-Out Voltage Threshold (falling) Pin 4 Input Bias Current @ VBO = 1 V TBD 0.65 -500 1.3 0.7 - TBD 0.75 500 V V nA Switching Frequency 58 65 72 kHz Duty Cycle Range 0-97 % Current Sense Pin Offset Voltage, (ICS = 100 mA) Over-Current Protection Threshold - 185 10 200 - 215 mV mA nA2 Voltage Reference Error Amplifier Current Capability Error Amplifier Gain Pin 6 Bias Current @ VFB = Vref Pin5 Voltage Maximum Control Voltage @ VFB = 2 V Minimum Control Voltage @ VFB = 3 V Ratio (Vout Low Detect Thresold / Vref) Ratio (Vout Low Detect Hysteresis / Vref) Pin 5 Source Current when (Vout Low Detect) is activated 2.425 - 100 -500 - - 2.7 94 - 180 2.5 20 200 - 3.7 0.7 3 95 0.5 220 2.575 - 300 500 - - 3.3 96 - 250 V mA mS nA V Source Resistance @ Ipin8 = 100 mA Sink Resistance @ Ipin8 = -100 mA Gate Drive Voltage Rise Time from 1.5 V to 13.5 V (CL = 2.2 nF) Gate Drive Voltage Fall Time from 13.5 V to 1.5 V (CL = 2.2 nF) - - - - 9 6.6 60 40 20 18 - - W W ns ns Rating Min Typ Max Unit
% % mA
+ I CS
V BO 2R
-
4
-
Over-Power Current Threshold (VBO = 0.9 V, VM = 3 V) Over-Power Current Threshold (VBO = 2.67 V, VM = 3 V)
174 56
222 75
308 110
mA
OVER-VOLTAGE PROTECTION VOVP / Vref TOVP Ratio (Over Voltage Threshold / Vref) Propagation Delay (VFB - 107% Vref) to Drive Low 103 - 105 500 107 - % ns
3. The above specification gives the targeted values of the parameters. The final specification will be available once the complete circuit characterization has been performed.
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NCP1654
Typical Electrical Characteristics Table (VCC = 15 V, TJ from -40C to +125C, unless otherwise specified) (Note 3)
Symbol UNDER-VOLTAGE PROTECTION / SHUTDOWN VUVP(on)/Vref VUVP(off)/Vref VUVP(H) TUVP THERMAL SHUTDOWN Tlimit Htemp Vstup Vdisable HUVLO DEVICE CONSUMPTION Icc_stup Icc_op1 Icc_op2 Icc_stdwn Power Supply Current: Start-Up (@ VCC = 12.4 V, version A and VCC = 9.4 V, version B) Operating (@ VCC = 15 V, no load, no switching) Operating (@ VCC = 15 V, no load, switching) Shutdown Mode (@ VCC = 15 V and VFB = 0 V) - - - - - 3.7 4.7 300 75 5 6 400 mA mA mA mA Thermal Shutdown Threshold Thermal Shutdown Hysteresis 150 - - 30 - - C C UVP Activate Threshold Ratio (TJ = 0C to +105C) UVP Deactivate Threshold Ratio (TJ = 0C to +105C) UVP Lockout Hysteresis Propagation Delay (VFB < 8% Vref) to Drive Low 4 6 - - 8 12 4 500 12 18 - - % % % ns Rating Min Typ Max Unit
VCC UNDER-VOLTAGE LOCKOUT SECTION Start-Up Threshold (Under-Voltage Lockout Threshold, VCC rising) - Version A Start-Up Threshold (Under-Voltage Lockout Threshold, VCC rising)- Version B Disable Voltage after Turn-On (Under-Voltage Lockout Threshold, VCC falling) Version A & B Under-Voltage Lockout Hysteresis - Version A Under-Voltage Lockout Hysteresis - Version B 12.5 9.6 8.25 4 1 13.75 10.5 9 4.75 1.5 15 11.4 9.75 - - V V V
3. The above specification gives the targeted values of the parameters. The final specification will be available once the complete circuit characterization has been performed. NOTE:
IM +
I cs 2
V V * Vf Iin , I + BO , I control + control Icontrol in 2R R
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NCP1654
Detailed Pin Description(s)
Pin Number 6 Name Feed-Back / Shutdown Function This pin receives a feedback signal VFB that is proportional to the PFC circuits output voltage. This information is used for both the output regulation, the over-voltage protection (OVP), and output undervoltage protection (UVP). When VFB goes above 105% Vref, OVP is activated and the Drive Output is disabled. When VFB goes below 8% Vref, the device enters a low-consumption shutdown mode. The voltage of this pin Vcontrol directly controls the input impedance and hence the power factor of the circuit. This pin is connected to an external capacitor Ccontrol to limit the Vcontrol bandwidth typically below 20 Hz to achieve near unity power factor. The device provides no output when Vcontrol < 0.7 V. Vcontrol is grounded when the circuits is off. In B version, when it starts to operate, Vcontrol raises slowly by inside 20 mA current source after VFB is higher than 95% of Vref, which obtains a linear control of the increasing duty cycle as a function of time. Hence reduce the voltage and current stress on the MOSFET. Soft Start function is achieved. In A version, when it starts to operate, Vcontrol raises rapidly by inside 200 mA current source. It is to boost the PFC output in a short time before the operation of the converter behind the PFC stage. Connect a resistor network among the rectified input voltage, pin4, and ground. And connect a capacitor between pin4 and ground. Pin4 detects a voltage signal proportional to the average input voltage. When VBO goes below 0.7 V, the circuit that detects too low input voltage conditions (brown- out), turns off the output driver and keeps it in low state till VBO exceeds 1.3 V (0.6 V hysteresis). This signal which is proportional to the RMS input voltage Vac is also for over-power limitation (OPL) and PFC duty cycle modulation. When the product
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Vcontrol / Soft-Start
4
Brown-Out / In
ICS
VBO u 4nA 2, 2R
OPL is activated and the Drive Output duty ratio is reduced by pulling down Vcontrol indirectly to reduce the input power. 3 Current Sense Input This pin sources a current ICS which is proportional to the inductor current IL. The sense current ICS is for over-current protection (OCP), over-power limitation (OPL) and PFC duty cycle modulation. When ICS goes above 200 mA, OCP is activated and the Drive Output is disabled. This pin provides a voltage VM for the PFC duty cycle modulation. The input impedance of the PFC circuits is proportional to the resistor RM externally connected to this pin. The device operates in average current mode if an external capacitor CM is connected to the pin. Otherwise, it operates in peak current mode. - The high current capability of the totem pole gate drive (1.5 A) makes it suitable to effectively drive high gate charge power MOSFET. This pin is the positive supply of the IC. The circuit typically starts to operate when VCC exceeds 13.75 V (version A), 10.5 V (version B) and turns off when VCC goes below 9 V. After start-up, the operating range is 9 V up to 20 V.
2
Multiplier Voltage
1 8 7
Ground Drive VCC
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NCP1654
Figure 1. Block Diagram
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NCP1654
DETAILED OPERATING DESCRIPTION
Introduction
The NCP1654 is a PFC driver designed to operate in fixed frequency, continuous conduction mode. The fixed frequency operation eases the compliance with EMI standard and the limitation of the possible radiated noise that may pollute surrounding systems. In addition, continuous conduction operation reduces the application dI/dt and their resulting interference. More generally, the NCP1654 is an ideal candidate in systems where cost-effectiveness, reliability and high power factor are the key parameters. It incorporates all the necessary features to build a compact and rugged PFC stage: * Compactness and Flexibility: housed in a DIP8 or SO8 package, the NCP1654 requires a minimum of external components. In particular, the circuit scheme simplifies the PFC stage design and eliminates the need for any input voltage sensing. In addition, the circuit offers some functions like the Brown-Out or the true power limiting that enable the optimizations of the PFC design, * Low Consumption and Shutdown Capability: the NCP1654 is optimized to exhibit consumption as small as possible in all operation modes. The consumed current is particularly reduced during the start-up phase and in shutdown mode so that the PFC stage power losses are extremely minimized when the circuit is disabled. This feature helps meet the more stringent stand-by low power specifications. Just ground the Feed-back pin to force the NCP1654 in shutdown mode, * Safety Protections: the NCP1654 permanently monitors the output voltage, the coil current and the die temperature to protect the system from possible over-stresses. Integrated protections (over-voltage protection, coil current limitation, thermal shutdown...) make the PFC stage extremely robust and reliable: - Maximum Current Limit: the circuit permanently senses the coil current and immediately turns off the power switch if it is higher than the set current limit. The NCP1654 also prevents any turn on of the power switch as long as the coil current is not below its maximum permissible level. This feature protects the MOSFET from possible excessive stress that could result from the switching of a current higher than the one the power switch is dimensioned for. In particular, this scheme effectively protects the PFC stage during the start-up phase when large in-rush currents charge the output capacitor, - Under-Voltage Protection / Shut-down: the circuit detects when the feed-back voltage goes below than about 8% of the regulation level. In this case, the circuit turns off and its consumption drops to a very low value. This feature protects the PFC stage from starting operation in case of low AC line conditions
*
or in case of a failure in the feed-back network (e.g., bad connection), - Fast Transient Response: given the low bandwidth of the regulation block, the output voltage of PFC stages may exhibit excessive over or under-shoots because of abrupt load or input voltage variations (e.g. at start up). If the output voltage is too far from the regulation level: Over-V oltage Protection: NCP1654 turns off the power switch as soon as Vout exceeds the OVP threshold (105% of the regulation level). Hence a cost & size effective bulk capacitor of lower voltage rating is suitable for this application, Vout Low Detect: NCP1654 drastically speeds up the regulation loop by its internal 200 mA enhanced current source when the output voltage is below 95% of its regulation level. - Brown-Out Detection: the circuit detects low AC line conditions and disables the PFC stage in this case. This protection mainly protects the power switch from the excessive stress that could damage it in such conditions, - Over-Power Limitation: the NCP1654 computes the maximum permissible current in dependence of the average input voltage measured by the brown-out block. When the circuit detects an excessive power transfer, it resets the PWM latch and pulls down the regulation block output as long as the calculated power keeps too high, - Thermal Shutdown: an internal thermal circuitry disables the circuit gate drive and then keeps the power switch off when the junction temperature exceeds 150C typically. The circuit resumes operation once the temperature drops below about 120C (30C hysteresis), - Soft Start: Vcontrol is pulled low as the IC is off, which VCC is lower than UVLO off, brown-out detection activates, or under-voltage protection activates, and no drive is provided. The soft-start function is done by disable the "200 mA enhanced current source" at start up. So there is only 20 mA to charge the Ccontrol, and makes Vcontrol increase slowly. This is to obtain a slow increasing duty cycle and hence reduce the voltage and current stress on the MOSFET. This soft-start function is designed in B version only. A version doesn't have this soft-start function, because VCC of A version is supposed to start up by the resistors connected to input voltage and should be able to boost the PFC output as soon as possible before the 2nd stage converter operates. So at start up period, Ccontrol will be charged by 220 mA current source and the PFC output will rise rapidly. Output Stage Totem Pole: the NCP1654 incorporates a 1.5A gate driver to efficiently drive TO220 or TO247 power MOSFETs.
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NCP1654
ORDERING INFORMATION
Device NCP1654P NCP1654PG NCP1654DR2 NCP1654DR2G Package PDIP-8 PDIP-8 (Pb-Free) SO-8 SO-8 (Pb-Free) Shipping 50 Units / Rail 50 Units / Rail 2500 Units / Tape & Reel 2500 Units / Tape & Reel
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
PACKAGE DIMENSIONS
SO-8 D SUFFIX CASE 751-07 ISSUE AG
-X- A
8 5
B
1
S
4
0.25 (0.010)
M
Y
M
-Y- G
K
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. DIMENSION A AND B DO NOT INCLUDE MOLD PROTRUSION. 4. MAXIMUM MOLD PROTRUSION 0.15 (0.006) PER SIDE. 5. DIMENSION D DOES NOT INCLUDE DAMBAR PROTRUSION. ALLOWABLE DAMBAR PROTRUSION SHALL BE 0.127 (0.005) TOTAL IN EXCESS OF THE D DIMENSION AT MAXIMUM MATERIAL CONDITION. 6. 751-01 THRU 751-06 ARE OBSOLETE. NEW STANDARD IS 751-07. MILLIMETERS MIN MAX 4.80 5.00 3.80 4.00 1.35 1.75 0.33 0.51 1.27 BSC 0.10 0.25 0.19 0.25 0.40 1.27 0_ 8_ 0.25 0.50 5.80 6.20 INCHES MIN MAX 0.189 0.197 0.150 0.157 0.053 0.069 0.013 0.020 0.050 BSC 0.004 0.010 0.007 0.010 0.016 0.050 0_ 8_ 0.010 0.020 0.228 0.244
C -Z- H D 0.25 (0.010)
M SEATING PLANE
N
X 45 _
0.10 (0.004)
M
J
ZY
S
X
S
DIM A B C D G H J K M N S
SOLDERING FOOTPRINT*
1.52 0.060
7.0 0.275
4.0 0.155
0.6 0.024
1.270 0.050
SCALE 6:1 mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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NCP1654
PACKAGE DIMENSIONS
PDIP-8 P SUFFIX CASE 626-05 ISSUE L
NOTES: 1. DIMENSION L TO CENTER OF LEAD WHEN FORMED PARALLEL. 2. PACKAGE CONTOUR OPTIONAL (ROUND OR SQUARE CORNERS). 3. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. DIM A B C D F G H J K L M N MILLIMETERS MIN MAX 9.40 10.16 6.10 6.60 3.94 4.45 0.38 0.51 1.02 1.78 2.54 BSC 0.76 1.27 0.20 0.30 2.92 3.43 7.62 BSC --- 10_ 0.76 1.01 INCHES MIN MAX 0.370 0.400 0.240 0.260 0.155 0.175 0.015 0.020 0.040 0.070 0.100 BSC 0.030 0.050 0.008 0.012 0.115 0.135 0.300 BSC --- 10_ 0.030 0.040
8
5
-B-
1 4
F
NOTE 2
-A-
L
C -T-
SEATING PLANE
J N D K
M
M TA
M
H
G 0.13 (0.005) B
M
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. "Typical" parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
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NCP1654/D

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