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| FAN4800 Datasheet, PDF (6/20 Pages) Fairchild Semiconductor – Low Start-Up Current PFC/PWM Controller Combos | |||
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Electrical Characteristics (Continued)
Unless otherwise stated, these specifications apply: VCC = 15V, RT = 52.3kΩ, CT = 470pF, TA = -40°C to 125°C.
Symbol
Parameter
PFC ILIMIT COMPARATOR
Vth(cs)
Threshold Voltage
Vth(cs)-Vgm
(PFC ILIMIT VTH â Gain Modulator
Output)
td(pfc_off) Delay to Output(1)
DC ILIMIT COMPARATOR
Vth(DC) Threshold Voltage
td(pwm_off) Delay to Output(1)
VIN OK COMPARATOR
Vth(OK) Threshold Voltage
HY(OK) Hysteresis
GAIN MODULATOR
G1
G2
Gain(3)
G3
G4
BW
Band Width(1)
Vo(gm)
Output Voltage
= 3.5kΩ x (ISENSE â IOFFSET)
OSCILLATOR
fosc1
Initial Accuracy
Îfosc1
Voltage Stability
Îfosc2
Temperature Stability
fosc2
Vramp
Total Variation
Ramp Valley to Peak Voltage(1)
tdead
PFC Dead Time
Idis
CT Discharge Current
REFERENCE
Vref1
ÎVref1
ÎVref2
ÎVref4
Vref2
ÎVref5
Output Voltage
Line Regulation
Load Regulation
Temperature Stability
Total Variation(1)
Long Term Stability(1)
Condition
Min.
-1.10
5
0.95
2.10
0.8
IAC = 100μA, VRMS = 0,
VFB = 1V, TA = 25°C
IAC = 100μA, VRMS = 1.1V,
VFB = 1V, TA = 25°C
IAC = 150μA, VRMS = 1.8V,
VFB = 1V, TA = 25°C
IAC = 300μA, VRMS = 3.3V,
VFB = 1V, TA = 25°C
IAC = 100μA
IAC = 250μA, VRMS = 1.1V,
VFB = 2V, TA = 25°C
0.70
1.80
0.90
0.25
0.80
TA = 25°C
68
11V < VCC < 16.5V
Line, Temp
66
VRAMP2 = 0V, VRAMP1 = 2.5V 6.5
TA = 25°C, I(VREF) = 1mA
7.4
11V < VCC < 16.5V
0mA < I(VREF) < 7mA
Line, Load, Temperature
7.35
TJ = 125°C, 1000 hours
5
Typ.
-1.00
100
250
1.00
250
1.0
0.84
2.00
1.00
0.32
10
1.00
1
2
2.75
685
7.5
10
10
0.4
Max. Unit
-0.90 V
mV
ns
1.05 V
ns
2.45 V
1.2
V
0.95
2.20
1.10
Gain(3)
0.40
MHz
1.20 V
81 kHz
%
%
84 kHz
V
ns
15.0 mA
7.6
V
25 mV
20 mV
%
7.65 V
25 mV
© 2005 Fairchild Semiconductor Corporation
FAN4800 Rev. 1.0.5
6
www.fairchildsemi.com
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