FAN4800_06 Datasheet, PDF (8/20 Pages) Fairchild Semiconductor – Low Start-Up Current PFC/PWM Controller Combos

Typical Performance Characteristics
126
119
112
105
98
91
84
77
70
63
56
2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0
V_FB (V)
Figure 3. Voltage Error Amplifier (gmv)
Transconductance
100
90
80
70
60
50
40
30
20
10
0
-10
-0.8 -0.6 -0.4 -0.2 0.0 0.2 0.4 0.6 0.8
I_SENSE (V)
Figure 4. Current Error Amplifier (gmi)
Transconductance
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.000.0 _{0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0}
V_RMS (V)
Figure 5. Gain Modulator Transfer Characteristic (K)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V_RMS (V)
Figure 6. Gain vs. V_RMS
K = ^{IGAINMOD − IOFFSET} mV ^−1
(1)
I_AC × (6 − 0.625)
Gain = ^{ISENSE − IOFFSET}
(2)
I_AC
© 2005 Fairchild Semiconductor Corporation
FAN4800 Rev. 1.0.5
8
www.fairchildsemi.com