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PDF NCP1607 Data sheet ( Hoja de datos )
| Número de pieza | NCP1607 | |
| Descripción | Cost Effective Power Factor Controller | |
| Fabricantes | ON Semiconductor | |
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NCP1607
Cost Effective Power Factor
Controller
The NCP1607 is an active power factor controller specifically
designed for use as a pre−converter in ac−dc adapters, electronic
ballasts, and other medium power off line converters (typically up to
250 W). It utilizes Critical Conduction Mode (CRM) to ensure unity
power factor across a wide range of input voltages and power levels.
The NCP1607 minimizes the number of external components. The
integration of comprehensive safety protection features makes it an
excellent choice for designing robust PFC stages. It is available in a
SOIC−8 package.
General Features
• “Unity” Power Factor
• No Need for Input Voltage Sensing
• Latching PWM for Cycle by Cycle On Time Control (Voltage Mode)
• High Precision Voltage Reference (±1.6% over the Temperature
Range)
• Very Low Startup Current Consumption (≤ 40 mA)
• Low Typical Operating Current (2.1 mA)
• Source 500 mA / Sink 800 mA Totem Pole Gate Driver
• Undervoltage Lockout with Hysteresis
• Pin to Pin Compatible with Industry Standards
• This is a Pb−Free Device
• This Device uses Halogen−Free Molding Compound
Safety Features
• Programmable Overvoltage Protection
• Open Feedback Loop Protection
• Accurate and Programmable On Time Control
• Accurate Overcurrent Detector
Typical Applications
• AC−DC Adapters, TVs, Monitors
• Off Line Appliances Requiring Power Factor Correction
• Electronic Light Ballast
www.onsemi.com
MARKING
8 DIAGRAMS
1
SO−8
D SUFFIX
CASE 751
8
1607B
ALYW
G
1
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
PIN CONNECTION
FB
Control
Ct
CS
(Top View)
VCC
DRV
GND
ZCD
ORDERING INFORMATION
Device
Package
Shipping†
NCP1607BDR2G SOIC−8 2500 / Tape & Reel
(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.
AC Line
EMI
Filter
LBOOST
RZCD
+
CIN
ROUT1
CCOMP
ROUT2
CT
VCC
NCP1607
18
FB VCC
27
Control DRV
3
Ct
6
GND
4
CS
5
ZCD
DBOOST
VOUT
LOAD
(Ballast,
SMPS, etc.)
+
CBULK
RS
Figure 1. Typical Application
© Semiconductor Components Industries, LLC, 2015
July, 2015 − Rev. 2
1
Publication Order Number:
NCP1607/D
1 page  
NCP1607
ELECTRICAL CHARACTERISTICS
(For typical values, TJ = 25°C. For min/max values, TJ = −40°C to +125°C, unless otherwise specified,
VCC = 12 V, VFB = 2.4 V, VCS = 0 V, VCONTROL = open, VZCD = open, CDRV = 1 nF, CT = 1 nF)
Characteristics
Symbol
Min Typ
Max Unit
Current Capability of the Negative Active Clamp:
in normal mode (VZCD = 300 mV)
in shutdown mode (VZCD = 100 mV)
Shutdown Threshold (VZCD falling)
Enable Threshold (VZCD rising)
Shutdown Comparator Hysteresis
Zero Current Detection Propagation Delay
Minimum Detectable ZCD Pulse Width
Drive off Restart Timer
RAMP CONTROL
Ct Charge Current (VCT = 0 V)
−25°C < TJ < +125°C
−40°C < TJ < +125°C
Time to discharge a 1 nF Ct capacitor from VCT = 3.4 V to 100 mV.
Maximum Ct level before DRV switches off
−25°C < TJ < +125°C
−40°C < TJ < +125°C
PWM Propagation Delay
OVER AND UNDERVOLTAGE PROTECTION
Dynamic Overvoltage Protection (OVP) Triggering Current:
TJ = 25°C
TJ = −40°C to +125°C
Hysteresis of the dynamic OVP current before the OVP latch is released
Static OVP Threshold Voltage
ICL(NEG)
VSDL
VSDH
VSD(HYS)
tZCD
tSYNC
tSTART
ICHARGE
tCT(discharge)
VCTMAX
tPWM
IOVP
IOVP(HYS)
VOVP
2.5 3.7
35 70
150 205
− 290
− 85
− 100
− 70
75 179
243 270
235 270
−−
2.9 3.2
2.9 3.2
− 142
5.0
100
250
350
−
170
−
300
297
297
100
3.3
3.4
220
9.0 10.5 11.8
8.7 − 12.1
− 8.5
−
− VEAL +
100 mV
−
mA
mA
mV
mV
mV
ns
ns
ms
mA
ns
V
ns
mA
mA
V
Undervoltage Protection (UVP) Threshold Voltage
VUVP
0.25 0.302
0.4
V
GATE DRIVE SECTION
Gate Drive Resistance:
ROH @ ISOURCE = 100 mA
ROL @ ISINK = 100 mA
ROH
ROL
W
− 12 18
− 6.0 10
Drive voltage rise time from 10% VCC to 90% VCC
trise − 30 80 ns
Drive voltage fall time from 90% VCC to 10% VCC
tfall − 25 70 ns
Driver output voltage at VCC = VCC(on) − 200 mV and Isink = 10 mA
VOUT(start)
−
−
0.2 V
3. Parameter values are valid for transient conditions only.
4. Parameter characterized and guaranteed by design, but not tested in production.
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product
performance may not be indicated by the Electrical Characteristics if operated under different conditions.
www.onsemi.com
5
5 Page 
NCP1607
When the switch is closed, the inductor current increases
linearly to its peak value. When the switch opens, the
inductor current linearly decreases to zero. At this point,
the drain voltage of the switch (Vd) is essentially floating
and begins to drop. If the next switching cycle does not
start, then the voltage will ring with a dampened frequency
around Vin. A simple derivation of equations (such as found
in AND8123), leads to the result that good power factor
correction in CRM operation is achieved when the on time
is constant across an ac cycle and is equal to:
ton
+
2
@
h
POUT @
@ Vac2
L
(eq. 1)
A simple plot of this switching over an ac line cycle is
illustrated in Figure 24. The off time varies based on the
instantaneous line voltage, but the on time is kept constant.
This naturally causes the peak inductor current (IL(pk)) to
follow the ac line voltage.
The NCP1607 represents an ideal method to implement
this constant on time CRM control in a cost effective and
robust solution. The device incorporates an accurate
regulation circuit, a low power startup circuit, and
advanced protection features.
VOUT
VIN(pk)
IL(pk)
IIN(pk)
VIN(t)
IL(t)
IIN(t)
ON
MOSFET
OFF
Figure 24. Inductor Waveform During CRM Operation
ERROR AMPLIFIER REGULATION
The NCP1607 is configured to regulate the boost output
voltage based on its built in error amplifier (EA). The error
amplifier ’s negative terminal is pinned out to FB, the
positive terminal is tied to a 2.5 V ± 1.6% reference, and the
output is pinned out to Control (Figure 25).
ROUT1
ROUT2
FB
RFB
CCOMP
Control
EA
−
+
VREF
VCONTROL
PWM BLOCK
ton(MAX)
ton
Slope
+
Ct
ICHARGE
tPWM
VEAL
VCONTROL
VEAH
Figure 25. Error Amplifier and On Time Regulation Circuits
A resistor divider from the boost output to the input of the
EA sets the FB level. If the output voltage is too low, then
the FB level will drop and the EA will cause the control
voltage to increase. This increases the on time of the driver,
which increases the power delivered and brings the output
back into regulation. Alternatively, if the output voltage
(and hence FB voltage) is too high, then the control level
decreases and the driver on times are shortened. In this way,
the circuit regulates the output voltage (VOUT) so that the
VOUT portion that is applied to FB through the resistor
divider ROUT1 and ROUT2 is equal to the internal reference
(2.5 V). The output voltage is set using Equation 2:
ǒ ǓVOUT + VREF @
ROUT1 ) REQ
REQ
(eq. 2)
Where REQ is the parallel combination of ROUT2 and RFB.
REQ is calculated using Equation 3:
REQ
+
ROUT2 @ RFB
ROUT2 ) RFB
(eq. 3)
www.onsemi.com
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet NCP1607.PDF ] | |
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