FAN6754_10 Datasheet, PDF (6/14 Pages) Fairchild Semiconductor – Highly Integrated Green- Mode PWM Controller

Electrical Characteristics (Continued)
VDD=15V and TA=25°C unless otherwise noted.
Symbol
Parameter
Conditions
Oscillator Section
fOSC Frequency in Normal Mode
tHOP Hopping Period
fOSC-G
fDV
fDT
Green-Mode Frequency
Frequency Variation vs. VDD Deviation
Frequency Variation vs. Temperature
Deviation
Center Frequency
Hopping Range
FB > VFB-N
FB=VFB-G
VDD=11V to 22V
TA=-40 to +105°C
Feedback Input Section
AV
ZFB
VFB-OPEN
VFB-OLP
tD-OLP
Input Voltage to Current-Sense Attenuation
Input Impedance
Output High Voltage
FB Open-Loop Trigger Level
Delay Time of FB Pin Open-Loop Protection
VFB-N Green-Mode Entry FB Voltage
VFB-G Green-Mode Ending FB Voltage
VFB-ZDCR FB Threshold Voltage for Zero-Duty Recovery
VFB-ZDC FB Threshold Voltage for Zero-Duty
FB Pin Open
Pin, FB Voltage
(FB =VFB-N)
Hopping Range
Pin, FB Voltage
(FB =VFB-G)
Hopping Range
Min. Typ. Max. Units
61
65
69
KHz
±3.7 ±4.2 ±4.7
3.9
4.4
4.9 ms
10.2 11.5 12.8 ms
19
22
25 KHz
5
%
5
%
1/4.5 1/4.0 1/3.5 V/V
14
16
18 kΩ
4.8
5.0
5.2
V
4.3 4.6 4.9 V
50
55
60 ms
2.6
2.8
3.0
V
±3.7 ±4.2 ±4.7 kHz
2.1
2.3
2.5
V
±1.27 ±1.45 ±1.62 kHz
1.9
2.1
2.3
V
1.8
2.0
2.2
V
Continued on the following page…
PWM Frequency
fOSC
fOSC-G
VFB-ZDC VFB-ZDCR V_FB-G
VFB-N
VFB
Figure 5. VFB vs. PWM Frequency
© 2010 Fairchild Semiconductor Corporation
FAN6754 • Rev. 1.0.2
6
www.fairchildsemi.com