FAN6862WLTY Datasheet, PDF (6/16 Pages) Fairchild Semiconductor – Highly Integrated Green-Mode PWM Controller

Electrical Characteristics (Continued)
V_DD = 15 V and T_A = 25°C, unless otherwise noted.
Symbol
Parameter
Condition
Oscillator Section
Center Frequency V_FB > V_FB-N
f_OSC
t_hop-1
t_hop-3
f_OSC-G
V_FB-N
Normal PWM Frequency
Hopping Range
Hopping Period 1⁽¹⁾
Hopping Period 3⁽¹⁾
Green Mode Minimum Frequency
FB Threshold Voltage for Frequency
Reduction
V_FB ≥ V_FB-N
V_FB = V_FB-G(1)
V_FB ≥ V_FB-N
V_FB = V_FB-G
V_FB-G
V_FB-ZDC
V_FB-ZDCR -
V_FB-ZDC
f_DV
f_DT
FB Voltage at f_OSC-G
FB Threshold Voltage for Zero-Duty
ZDC Hysteresis
Frequency Variation vs. V_DD Deviation
Frequency Variation vs. Temperature
Deviation⁽¹⁾
V_DD = 7.5 V to 21 V
T_A = -40 to +105°C
Min. Typ. Max. Unit
60
65
68
±4.0
kHz
±2.9
4.4
ms
11.5
ms
18
22
26
kHz
2.35 2.50 2.65
V
2.05 2.20 2.30
V
1.6
V
0.15
V
0.5
2.0
%
2
%
Continued on following page…
PWM Frequency
f_OSC
f_OSC-G
V_FB-ZDC V_FB-ZDCR V_FB-G
V_FB-N
V_FB
Figure 5. PWM Frequency
© 2012 Fairchild Semiconductor Corporation
FAN6862W • Rev. 1.0.0
6
www.fairchildsemi.com