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FAN6754 Datasheet(PDF) 7 Page - Fairchild Semiconductor

Part # FAN6754
Description  Highly Integrated Green- Mode PWM Controller
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Manufacturer  FAIRCHILD [Fairchild Semiconductor]
Direct Link  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

FAN6754 Datasheet(HTML) 7 Page - Fairchild Semiconductor

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© 2009 Fairchild Semiconductor Corporation
www.fairchildsemi.com
FAN6754 • Rev. 1.0.1
7
Electrical Characteristics (Continued)
VDD=15V and TA=25°C unless otherwise noted.
Symbol
Parameter
Conditions
Min.
Typ.
Max. Units
Oscillator Section
fOSC
Frequency in Normal Mode
Center Frequency
61
65
69
KHz
Hopping Range
±3.7
±4.2
±4.7
tHOP
Hopping Period
FB > VFB-N
3.9
4.4
4.9
ms
FB=VFB-G
10.2
11.5
12.8
ms
fOSC-G
Green-Mode Frequency
19
22
25
KHz
fDV
Frequency Variation vs. VDD Deviation
VDD=11V to 22V
5
%
fDT
Frequency Variation vs. Temperature
Deviation
TA=-40 to +105°C
5
%
Feedback Input Section
AV
Input Voltage to Current-Sense Attenuation
1/4.5
1/4.0
1/3.5
V/V
ZFB
Input Impedance
14
16
18
kΩ
VFB-OPEN Output High Voltage
FB Pin Open
4.8
5.0
5.2
V
VFB-OLP
FB Open-Loop Trigger Level
4.3
4.6
4.9
V
tD-OLP
Delay Time of FB Pin Open-Loop Protection
50
55
60
ms
VFB-N
Green-Mode Entry FB Voltage
Pin, FB Voltage
(FB =VFB-N)
2.6
2.8
3.0
V
Hopping Range
±
3.7
±
4.2
±
4.7
kHz
VFB-G
Green-Mode Ending FB Voltage
Pin, FB Voltage
(FB =VFB-G)
2.1
2.3
2.5
V
Hopping Range
±
1.27
±
1.45
±
1.62
kHz
VFB-ZDCR FB Threshold Voltage for Zero-Duty Recovery
1.9
2.1
2.3
V
VFB-ZDC
FB Threshold Voltage for Zero-Duty
1.8
2.0
2.2
V
Continued on the following page…
Figure 8. VFB vs. PWM Frequency
PWM Frequency
fOSC
fOSC-G
VFB-N
VFB-G
VFB-ZDC
VFB
VFB-ZDCR


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