ETC FAN7527D

www.fairchildsemi.com
FAN7527
Power Factor Correction Controller
Features
Description
• Internal Startup Timer
• Internal R/C filter eliminates the Need for an External
R/C filter
• Very Precise Adjustable Output Over Voltage Protection
• Zero Current Detector
• One Quadrant Multiplier
• Trimmed 1.5% Internal Bandgap Reference
• Under Voltage Lock Out with 3V of Hysteresis
• Totem Pole Output with High State Clamp
• Low Startup and Operating Current
• 8-Pin DIP or 8-Pin SOP
The FAN7527 provides simple and high performance active
power factor correction. FAN7527 is optimized for
electronic ballast and low power, high density power
supplies which require minimum board area reduced
component count and low power dissipation. Internal R/C
filter eliminates the need for an external R/C filter. Internally
clamping the error amplifier and multiplier outputs,
improves turn on overshoot characteristics and current
limiting. Special circuitry has also been added to prevent no
load runaway conditions. Independent of supply voltage, the
output drive clamping circuit limits overshoot of the power
MOSFET gate drive. This greatly enhances the system
reliability.
Applications
• Electronic Ballast
• SMPS
8-DIP
1
8-SOP
1
Rev 1.0.3
©2001 Fairchild Semiconductor Corporation
FAN7527
Internal Block Diagram
Vcc
8
Vcc
2.5V Ref
+
UVLO
Internal
Internal
Bias
Drive
Output
12V ↔ 9V
7
OUT
1
INV
Timer R
Idet
5
S
+
6.5V
7.2V
-
2V ↔ 1.5V
Zero Current
Detector
Static OVP
Q
40K
CS
+
+
4
R
8pF
2.25V
-
Current Sense
Comparator
Vref
1.8V
Veao(L) = 2.25V
Vmo
0.25V
-
Vm1
MULT 3
+
+
-
0 ~ 3.8V
Vm2
Vref ~ Vref+2.5V
Multiplier
K =
2
Vref
Vea(-)
Error Amp
OVP Current
Detector
Vmo
Vm1 * (Vm2-Vref)
GND
6
2
GND
EA_OUT
Isovp=30uA
Idovp=40uA
FAN7527
PIN Description
INV
1
8
Vcc
EA_OUT
2
7
OUT
MULT
3
6
GND
CS
4
5
ldet
(Top View)
Pin Number
Pin Name
Pin Function Descrition
1
INV
Inverting input of the error amplifier. The output of the boost converter
should be resistively divided to 2.5V and connected to this pin.
2
EA_OUT
The output of the error amplifier. A feedback conpensation network is
placed between this pin and the INV pin.
3
MULT
Input to the multiplier stage. The full-wave rectified AC is devided to
less than 2V and is connected to this pin.
Input to the PWM comparator. Current is sensed in the boost stage
MOSFET by a resistor in the source lead. An internal leading edge
blanking circuitry has been included to reject any high frequency noise
present on the current waveform.
4
CS
5
ldet
6
GND
The ground potential of all the pins.
7
OUT
Gate driver output . A push pull output stage is able to drive the Power
MOSFET with peak current of 400mA.
8
Vcc
Supply voltage of driver and control circuits.
The zero current detector senses the inductor current by monitoring
when the boost inductor auxilary winding voltage falls below 1.8V. If it
is connected to GND, the device is disabled.
3
FAN7527
Absolute Maximum Ratings (Ta=25°°C)
Characteristics
Symbol
Value
Unit
VCC
30
V
Peak Drive Output Current
IOH,IOL
±500
mA
Driver Output Clamping Diodes Vo > Vcc or Vo < -0.3V
lclamp
±10
mA
Detector Clamping Diodes
ldet
±10
mA
Error Amp, Multiplier And Comparator Input Voltages
Vin
-0.3 to 6
V
Supply Voltage
Tj
150
°C
Operating Temperature Range
Topr
-25 to 125
°C
Storage Temperature Range
Tstg
-65 to 150
°C
Pd
0.8
W
Operating Junction Temperature
Power Dissipation
Temperature Characteristics (-25°°C ≤ Ta ≤ 125°°C)
4
Characteristics
Symbol
Min.
Typ.
Max.
Unit
Temperature Stability for Reference Voltage (Vref)
∆ Vref
-
20
-
mV
Temperature Stability for Multiplier Gain (K)
∆ K/∆T
-
0.2
-
%/°C
FAN7527
Electrical Characteristics
VCC= 14V, -25°C ≤ Ta ≤ 125°C, unless otherwise stated.
Characteristics
Symbol
Test Condition
Min.
Typ.
Max.
Unit
10.5
11.5
12.5
V
2
3
4
V
20
60
100
uA
-
3
6
mA
Vinv = 3V
-
1.7
4
mA
50KHz, CI = 1nF
-
4
8
mA
Iref =0mA, Ta =25°C
2.465
2.5
2.535
V
0 ≤ Ta ≤ 125°C
2.44
2.5
2.56
V
< UNDER VOLTAGE LOCK OUT SECTION>
Start Threshold Voltage
Vth(st)
UVLO Hysteresis
HY(st)
Vcc Increasing
-
< SUPPLY CURRENT SECTION >
Start-up Supply Current
Ist
Vcc =Vth(st) -0.2V
Operating Supply Current
Icc
Output not switching
Operating Current at OVP
Icc(ovp)
Dynamic Operating Supply Current
Idcc
< ERROR AMPLIFIER SECTION >
Voltage Feedback Input Threshold
Vref
Line Regulation
∆Vref1
14V ≤ Vcc ≤ 25V
-
0.1
10
mV
Temperature Stability Of Vref (Note1)
∆Vref3
-25 ≤ Ta ≤ 125°C
-
20
-
mV
Input Bias Current
Ib(ea)
-0.5
-
0.5
uA
Output Source Current
Isource
Vm2 = 4V
-2
-4
-
mA
Isink
Vm2 = 4V
2
4
-
mA
-
6
-
V
Output Sink Current
-
Output Upper Clamp Voltage (Note2)
Veao(H)
Isource = 0.1mA
Output Lower Clamp Voltage (Note3)
Veao(L)
Isink = 0.1mA
Large Signal Open Loop Gain (Note4)
Gv
Power Supply Rejection Ratio (Note5)
PSRR
Unity Gain Bandwith (Note6)
GBW
-
2.25
-
V
60
80
-
dB
60
80
-
dB
-
-
1
-
MHz
SR
-
-
0.6
-
V/us
Input Bias Current (Pin3)
Ib(m)
-
-0.5
-
0.5
uA
M1 Input Voltage Range (Pin3)
∆Vm1
-
0
-
3.8
V
M2 Input Voltage Range (Pin2)
∆Vm2
-
Vref
-
Vref+2.5
V
Slew Rate (Note7)
14V ≤ Vcc ≤ 25V
< MULTIPLIER SECTION>
Multiplier Gain (Note8)
Maximum Multiplier Output Voltage
Temperature Stability Of K (Note9)
K
Vm1 = 1V, Vm2 = 3.5V
Vomax(m) Vinv =0V, Vm1 = 4V
∆K/∆T
-25 ≤ Ta ≤ 125°C
0.36
0.44
0.52
1/V
1.65
1.8
1.95
V
-
-0.2
-
%/°C
5
FAN7527
Electrical Characteristics(Continued)
VCC= 14V, -25°C ≤ Ta ≤ 125°C, unless otherwise stated.
Characteristics
Symbol
Test Condition
Min.
Typ.
Max.
Unit
< CURRENT SENSE SECTION>
Input Offset Voltage (Note8)
Vio(cs)
Vm1=0V , Vm2 = 2.2V
-10
3
10
mV
Input Bias Current
Ib(cs)
0V ≤ Vcs ≤ 1.7V
-1
-0.1
1
uA
Current Sense Delay To Output
(Note11)
tb(cs)
-
200
500
ns
1.7
2
2.3
V
-
< DETECT SECTION >
Input Voltage Threshold
Detect Hysteresis
Vth(det)
Vdet Increasing
HY(det)
-
0.2
0.5
0.8
V
Idet = -100uA
0.45
0.75
1
V
6.5
7.2
7.9
V
-1
-0.1
1
uA
-
-
±3
mA
Input Low Clamp Voltage
Vclamp(I)
Input High Clamp Voltage
Vclamp(h) Idet = 3mA
Input Bias Current
Input High/low Clamp Diode Current
(Note12)
Ib(det)
1V ≤ Vdet ≤ 5V
Iclamp(d)
-
< OUTPUT SECTION >
Output Voltage High
Voh
Io = -10mA
10.5
11
-
V
Output Voltage Low
VoI
Io = 10mA
-
0.8
1
V
CI = 1nF
-
130
200
ns
Rising Time (Note13)
Falling Time (Note14)
tr
-
50
120
ns
Maximum Output Voltage
Vomax(o)
tf
Vcc = 20V, Io = 100uA
CI = 1nF
12
14
16
V
Output Voltage With UVLO Activated
Vomin(o)
Vcc = 5V , Io = 100uA
-
-
1
V
td(rst)
Vm1 = 1V, Vm2 = 3.5V
-
500
-
us
< RESTART TIMER SECTION>
Restart Time Delay
<OVER VOLTAGE PROTECTION SECTION>
Soft OVP Detecting Current
Isovp
-
25
30
35
uA
Dynamic OVP Detecting Current
Idovp
-
35
40
45
uA
Static OVP Threshold Voltage
Vovp
Vinv = 2.7V
2.1
2.25
2.4
V
Note : 1 ~ 14 These parameters, although guaranteed, are not 100% tested in production.
Pin4_Threshold
Multiplier Gain: K = ------------------------------------------------------- ...... ( Vm1 = Vpin3,Vm2 = Vpin2 )
Vm1 × ( Vm2 – Vref )
6
FAN7527
Typical Performance Characteristics
Fig.2 Multiplier Input Voltage vs. C.S. Threshold
Fig.1 E.A. Output Voltage vs. C.S. Threshold
2.0
2.0
Vm1=3.0V Vm1=2.5V Vm1=2.0V
Vm1=1.5V
1.5
C.S. Threshold Voltage(V)
C.S Threshold Voltage(V)
Veao=4.25V Veao=4.0V Veao=3.75V
1.8
Vm1=3.5V
Vm1=4.0V
Vm1=1.0V
1.0
Vm1=0.5V
0.5
1.6
Veao=4.5V
Veao=3.5V
Veao=3.25V
1.4
1.2
Veao=3.0V
1.0
0.8
Veao=2.75V
0.6
0.4
Veao=2.5V
0.2
Vm1=0V
0.0
0.0
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0
1
EA Output Voltage(V)
2
3
4
5
Multiplier Input Voltage(V)
Figure 2. Multiplier Input Voltage
vs Current Sensing Threshold
Figure 1. Error Amplifier Output Voltage
vs Current Sensing Threshold
Fig.4 Reference Voltage vs. Temperature
Fig.3 Supply Current vs. Supply Voltage
2.7
0.015
Reference Voltage(V)
Supply Current(A)
0.012
0.009
0.006
2.6
2.5
2.4
0.003
0.000
2.3
0
10
20
30
40
50
-25
0
25
Supply Voltage(V)
50
75
100
125
Temperature (℃)
Figure 4. Reference Voltage vs Temperature
Figure 3. Supply Current vs Supply Voltage
Fig.6 UV Lockout Hysteresis vs. Temperature
Fig.5 Start-up Threshold vs. Temperature
5
14
4
UV Lockout Hyteresis(V)
Startup Threshold(V)
12
10
8
6
4
3
2
1
2
0
0
-25
0
25
50
75
100
Temperature (℃)
Figure 5. Start-Up Threshold vs Temperature
7
125
-25
0
25
50
75
100
125
Temperature (℃)
Figure 6. UV Lockout Hysteresis vs Temperature
FAN7527
Typical Performance Characteristics (continued)
Fig.7 Start-up Supply Current vs. Temperature
Fig.8 E.A. Source CurrenT vs. Temperature
100
0
90
-1
EA Source Current(mA)
Start-up Supply Current(uA)
80
70
60
50
40
30
20
-2
-3
-4
10
0
-5
-25
0
25
50
75
100
125
-25
0
25
Temperature (℃)
50
75
100
125
Temperature (℃)
Figure 8. Error Amplifier Source Current
vs Temperature
Figure 7. Start-Up Supply Current vs Temperature
Fig.10 E.A. Input Bias Current vs. Temperature
Fig.9 E.A. Sink Current vs. Temperature
0.5
5
0.4
EA Input Bias Current(uA)
EA Sink Current(mA)
4
3
2
1
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
-0.4
-0.5
0
-25
0
25
50
75
100
-25
125
0
25
100
125
Fig.12 Idet Threshold Voltage vs. Temperature
Fig.11 Multiplier Gain vs. Temperature
1.0
4.0
0.8
3.2
Idet Threshold Voltage(V)
Multiplier Gain(1/V)
75
Figure 10. Error Amplifier Input Bias Current
vs Temperature
Figure 9. Error Amplifier Sink Current
vs Temperature
0.6
0.4
0.2
0.0
2.4
1.6
0.8
0.0
-25
0
25
50
75
100
Temperature (℃)
Figure 11. Multiplier Gain vs Temperature
8
50
Temperature (℃)
Temperature (℃)
125
-25
0
25
50
75
100
125
Temperature (℃)
Figure 12. ldet Threshold Voltage vs Temperature
FAN7527
Typical Performance Characteristics (continued)
Fig.13 Idet Input Hysteresis vs. Temperature
Fig.14 Restart Time vs. Temperature
1.0
1000
900
800
700
Restart Time(uS)
Idet Input Hysteresis(mV)
0.8
0.6
0.4
0.2
600
500
400
300
200
100
0.0
0
-25
0
25
50
75
100
125
-25
0
25
Temperature (℃)
75
100
125
Figure 14. Restart Time vs Temperature
Figure 13. ldet Input Hysteresis vs Temperature
Fig.15 Max. Mult. Output Voltage vs. temperature
Fig.16 Supply Current vs. Temperature
2.0
5
1.6
4
Supply Current(mA)
Maximum Mult. Output Voltage(V)
50
Temperature (℃)
1.2
0.8
3
2
1
0.4
0
0.0
-25
0
25
50
75
100
125
Temperature (℃)
Figure 15. Max.Mult.Output Voltage vs Temperature
-25
0
25
50
75
100
125
Temperature (℃)
Figure 16. Supply Current vs Temperature
9
FAN7527
Mechanical Dimensions
Package
Dimensions in millimeters
1.524 ±0.10
#5
2.54
0.100
5.08
MAX
0.200
7.62
0.300
3.40 ±0.20
0.134 ±0.008
+0.10
0.25 –0.05
+0.004
0~15°
10
0.010 –0.002
3.30 ±0.30
0.130 ±0.012
0.33
MIN
0.013
0.060 ±0.004
#4
0.018 ±0.004
#8
9.60
MAX
0.378
#1
9.20 ±0.20
0.362 ±0.008
(
6.40 ±0.20
0.252 ±0.008
0.46 ±0.10
0.79
)
0.031
8-DIP
FAN7527
Mechanical Dimensions (Continued)
Package
Dimensions in millimeters
8-SOP
MIN
#5
6.00 ±0.30
0.236 ±0.012
8°
0~
+0.10
0.15 -0.05
+0.004
0.006 -0.002
MAX0.10
MAX0.004
1.80
MAX
0.071
3.95 ±0.20
0.156 ±0.008
5.72
0.225
0.41 ±0.10
0.016 ±0.004
#4
1.27
0.050
#8
5.13
MAX
0.202
#1
4.92 ±0.20
0.194 ±0.008
(
0.56
)
0.022
1.55 ±0.20
0.061 ±0.008
0.1~0.25
0.004~0.001
0.50 ±0.20
0.020 ±0.008
11
FAN7527
Ordering Information
Product Number
12
Package
FAN7527
8-DIP
FAN7527D
8-SOP
Operating Temperature
-25 ~ +125oC
FAN7527
13
FAN7527
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
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 2001 Fairchild Semiconductor Corporation