IC PFC CONTROLLER CCM/DCM 16SOIC

NCP1651DR2G

Manufacturer Part NumberNCP1651DR2G
DescriptionIC PFC CONTROLLER CCM/DCM 16SOIC
ManufacturerON Semiconductor
NCP1651DR2G datasheet
 


Specifications of NCP1651DR2G

ModeContinuous Conduction (CCM), Discontinuous Conduction (DCM)Frequency - Switching250kHz
Current - Startup8.5mAVoltage - Supply10 V ~ 18 V
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case16-SOIC (3.9mm Width)Switching Frequency25 KHz to 250 KHz
Maximum Operating Temperature+ 125 CMounting StyleSMD/SMT
Minimum Operating Temperature- 40 CLead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesNCP1651DR2GOS
NCP1651DR2GOS
NCP1651DR2GOSTR
  
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NCP1651
Single Stage Power Factor
Controller
The NCP1651 is an active, power factor correction controller that
can operate over a wide range of input voltages. It is designed for
50/60 Hz power systems. It is a fixed frequency controller that can
operate in continuous or discontinuous conduction modes.
The NCP1651 provides a low cost, low component count solution
for isolated AC- -DC converters with mid- -high output voltage
requirements. The NCP1651 eases the task of meeting the
IEC1000- -3- -2 harmonic requirements for converters in the range of
50 W - - 250 W.
The NCP1651 drives a flyback converter topology to operate in
continuous/discontinuous mode and programs the average input
current to follow the line voltage in order to provide unity power
factor. By using average current mode control CCM algorithm, the
NCP1651 can help provide excellent power factor while limiting the
peak primary current. Also, the fixed frequency operation eases the
input filter design.
The NCP1651 uses a proprietary multiplier design that allows for
much more accurate operation than with conventional analog
multipliers.
Features
Fixed Frequency Operation
Average Current Mode PWM
Internal High Voltage Startup Circuit
Continuous or Discontinuous Mode Operation
High Accuracy Multiplier
Overtemperature Shutdown
External Shutdown
Undervoltage Lockout
Low Cost/Parts Count Solution
Ramp Compensation Does Not Affect Oscillator Accuracy
This is a Pb- -Free Device
Typical Applications
High Current Battery Chargers
Front Ends for Distributed Power Systems
 Semiconductor Components Industries, LLC, 2010
December, 2010 - - Rev. 9
http://onsemi.com
SOIC- -16
16
D SUFFIX
CASE 751B
1
A
= Assembly Location
WL
= Wafer Lot
Y
= Year
WW
= Work Week
G
= Pb--Free Package
PIN CONNECTIONS
OUT
1
GND
2
C
3
T
RAMP COMP
4
I
5
S+
I
6
avg--fltr
I
7
avg
FB/SD
8
(Top View)
ORDERING INFORMATION
Device
Package
NCP1651DR2G
SOIC--16
(Pb--Free)
†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.
1
MARKING
DIAGRAM
NCP1651G
AWLYWW
STARTUP
16
15
NC
14
NC
13 V
CC
V
12
ref
AC COMP
11
AC REF
10
AC INPUT
9
Shipping
2500/Tape & Reel
Publication Order Number:
NCP1651/D

NCP1651DR2G Summary of contents

  • Page 1

    ... I 7 avg FB/SD 8 (Top View) ORDERING INFORMATION Device Package NCP1651DR2G SOIC--16 (Pb--Free) †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. 1 MARKING DIAGRAM NCP1651G AWLYWW ...

  • Page 2

    PIN FUNCTION DESCRIPTION Pin No. Function 1 Output Drive output for power FET or IGBT. Capable of driving small devices, or can be connected to an external driver for larger transistors. 2 Ground Ground reference for the circuit ...

  • Page 3

    MAXIMUM RATINGS (Maximum ratings are those that, if exceeded, may cause damage to the device. Electrical Characteristics are not guaranteed over this range.) Rating Power Supply Voltage (Operating) Output (Pin 1) Current Sense Amplifier Input (Pin 5) FB/SD Input (Pin ...

  • Page 4

    ELECTRICAL CHARACTERISTICS values. For min/max values T is the applicable junction temperature.) j Characteristic OSCILLATOR Frequency T = --40C to +125C j Frequency Range (Note 1) Max Duty Cycle Ramp Peak (Note 1) Ramp Valley (Note 1) Ramp Compensation Peak ...

  • Page 5

    ELECTRICAL CHARACTERISTICS typical values. For min/max values T is the applicable junction temperature.) j Characteristic DRIVE OUTPUT Source Resistance (1.0 Volt Drop) Sink Resistance (1.0 Volt Drop) Rise Time (C = 1.0 nF) L Fall Time (C = 1.0 nF) ...

  • Page 6

    3.8 k FB/SD 8 V--I CONVERTER A REFERENCE 0.75 V MULTIPLIER AC INPUT REF 4 COMP AVERAGE CURRENT COMPENSATION GND 2 ...

  • Page 7

    DRIVE LATCH Q AC Error Amp + Ramp Comp + Inductor Current 4 V GND FB/SD 0.5 V GND OSCILLATOR RAMP OSCILLATOR BLANKING PULSE 9.8 V OFF STARTUP ENABLE ON MAX OUTPUT CURRENT 0 ...

  • Page 8

    TND308/ PIN 100 200 300 I (mV) S+ Figure 4. Current Sense Amplifier Gain 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 ...

  • Page 9

    TEMPERATURE (C) Figure 10. UVLO versus Temperature 5 4.5 FB/ 3.5 3 2.5 2 1 INPUT (V) ...

  • Page 10

    Typical Performance Characteristics (Test circuits are located in the document TND308/ 100 150 200 FREQUENCY (kHz) Figure 16. Maximum Duty Cycle versus Frequency 2.0 ms/div Figure 18. Transient Response for 6.5 ...

  • Page 11

    TND308/D) 4.12 NOTE: Valley Voltage is Zero 4.10 4.08 4.06 4.04 --50 -- TEMPERATURE (C) Figure 20. Peak Ramp Voltage versus Temperature 1 0.8 0.6 0.4 0.2 0 --50 Typical ...

  • Page 12

    FB/SD 9 680 SHUT DOWN 5 AC INPUT (Allows external converters to be synchronized to the switching frequency of this unit.) Figure 23. External Shutdown Circuit 33 k BAS16LT1 MMBT2907AL 0.33 mF Figure 24. Soft- -Start Circuit http://onsemi.com 6.5 V ...

  • Page 13

    ... I ON Semiconductor’s NCP1651 offers a unique alternative for Power Factor Correction designs, where the NCP1651 has been designed to control a PFC circuit operating in a flyback topology. There are several major advantages to using the flyback topology ...

  • Page 14

    If we look at a single application and compare the results watts O Vin = 85- -265 V (analyzed rms Efficiency = 80 108 Vdc O Freq ...

  • Page 15

    ... CCM range) and range of duty cycles over the operational line and load range. ON Semiconductor has designed an Excel- -based spreadsheet to help design with the NCP1651 and balance these trade- -offs. The design aid is downloadable free- -of- -charge from our website (www ...

  • Page 16

    Figure 30. Simplified Block Diagram of Basic PFC Control Circuit http://onsemi.com 16 ...

  • Page 17

    The key to understanding how the input current is shaped into a high quality sine wave is the operation of the AC error amplifier. The inputs of an operational amplifier operating in its linear range, must be equal. There are ...

  • Page 18

    DC Reference and Buffer The internal DC reference is a precision bandgap design with a nominal output voltage of 4.0 volts temperature compensated, and trimmed for a 1% tolerance of its nominal voltage, with an overall tolerance of ...

  • Page 19

    The reference multiplier contains an internal loading resistor, with a nominal value of 25 kΩ. This is because the resistor that converts the A input voltage into a current is internal. Making both of these resistors internal, allows for good ...

  • Page 20

    Oscillator + -- 4 Ramp Compensation R RC Figure 35. Ramp Compensation Circuit The current mirror is designed with a 1:1.6 current ratio. The ramp signal injected can be calculated by the following formula: 1.6 Vosc pk ...

  • Page 21

    The input to the current sense amplifier is a common base configuration. The voltage developed across the current shunt is sensed at the Is+ input. The amplifier input is designed for positive going voltages only; the power stage should resemble ...

  • Page 22

    There is a hysteresis of 30C on this circuit, which will allow the chip to cool down to 130C before resuming operation. While in the overtemperature shutdown mode, the startup circuit will be operational and the V CC 10.8 and ...

  • Page 23

    See Figure 3 for timing diagram. The unit will remain operational as long as the V voltage remains above the UVLO undervoltage trip point. If the V voltage is reduced to the undervoltage trip ...

  • Page 24

    ... ON Semiconductor provides a spread sheet that incorporates the relevant equations, and will calculate the bias components for a circuit using the schematic shown ...

  • Page 25

    ... If you are designing your own transformer, the ON Semiconductor spreadsheet (NCP1651_Design.xls) that is available as a design aid for this part can be of help. Enter various values of inductance as well as the turns ratio and observe the variation in duty cycle and peak current vs. ...

  • Page 26

    Error Amplifier The error amplifier resides on the secondary side of the circuit, and therefore is not part of the chip. A minimal solution would include either a discrete amplifier and reference integrated circuit that combines both, such ...

  • Page 27

    AC Voltage Divider The voltage divider from the input rectifiers to ground is a simple but important calculation. For this calculation it is necessary to know the maximum line that the unit can operate at. The peak input voltage will ...

  • Page 28

    Current Scaling Resistor & Filter Capacitor R sets the gain of the averaged current signal out of the 7 current sense amplifier which is fed into the AC error amplifier used to scale the current to the appropriate ...

  • Page 29

    R R dc1 opto V FB/ V ref2 + 0.022 mF ERROR AMP R dc2 DIVIDER ERROR AMP R dc2 V′ ...

  • Page 30

    Optocoupler Transfer The optocoupler is used to allow for galvanic isolation for the error signal from the secondary to primary side circuits. The gain is based on the Current Transfer Ratio of the device. This can change over temperature and ...

  • Page 31

    FREQUENCY (Hz) Figure 45. Forward Gain Plot For a crossover frequency of 10 Hz, the error amplifier needs a gain of - -25 dB ...

  • Page 32

    ... *For additional information on our Pb--Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D. 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. “ ...