FAN6747 Datasheet, PDF (8/15 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

Electrical Characteristics
VDD=15V and TA=25°C, unless otherwise specified.
Symbol
SG
VOZ-ON
VFB-ZDC
(VOZ-OFF)
VOZ-ON
- VOZ-OFF
fDV
fDT
Parameter
Conditions
Slope for Green-Mode Modulation
FB Threshold Voltage for Zero-
Duty Recovery
FB Threshold Voltage for Zero-
Duty
FB Voltage Hysteresis for VOZ-ON
to VOZ-OFF
Frequency Variation vs. VDD
Deviation
VDD=12V to 22V
Frequency Variation vs.
Temperature Deviation
TA=-40 to 105°C
Min.
1.6
1.5
50
Typ.
85
1.8
1.7
100
Max.
2.0
1.9
150
5
5
Units
Hz/mV-
V
V
mV
%
%
Figure 10. PWM Frequency
Figure 11. Burst-Mode Diagram
Feedback Input Section
AV
Input-Voltage to Current-Sense
Attenuation
ZFB
Input Impedance
VFBO
FB Pin Open Voltage
VFB-OLP
FB Open-Loop Protection
Threshold Voltage
tD-OLP
Open-Loop Protection Delay
VFB < VFB-G
1/4.5
13.4
4.8
4.3
190
© 2009 Fairchild Semiconductor Corporation
FAN6747 • Rev. 1.0.1
8
1/4.0
15.5
5.0
4.6
215
1/3.5
V/V
17.6
kΩ
5.2
V
4.9
V
240
ms
www.fairchildsemi.com