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KA7577D Arkusz danych(PDF) 4 Page - Fairchild Semiconductor

Numer części KA7577D
Szczegółowy opis  SMPS Controller
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Producent  FAIRCHILD [Fairchild Semiconductor]
Strona internetowa  http://www.fairchildsemi.com
Logo FAIRCHILD - Fairchild Semiconductor

KA7577D Arkusz danych(HTML) 4 Page - Fairchild Semiconductor

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KA7577
4
Electrical Characteristics
(VCC=18V, TA=25°C, unless otherwise specified)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
OVER VOLTAGE PROTECTION SECTION
OVP Terminal Threshold Voltage
VTH(OVP)
-1.0
1.4
1.8
V
OVP Terminal Input Current
II(OVP)
--
1.2
3.6
µA
OVP Cancellation Voltage
VCC(OVPC)
-7.6
8.6
-
V
Difference Voltage Between
Operating Stop and OVP Cancellation
∆VCC(OVP)
-
0.65
1.3
-
V
TIMER SECTION
Timer Frequency
f(TIMER)
-
0.27
0.4
0.6
Hz
Timer Charge Current
ICHG(TIMER)
TA = -5
°C
TA = 25
°C
TA = 85
°C
-193
-178
-147
-138
-127
-105
-102
-94
-78
µA
Off Time/On Time Ratio
K
-
7.0
8.7
11.0
-
CURRENT LINITTING SECTION
CLM( - ) Terminal Threshold Voltage
VTH(CLM - )
TA = - 5 to + 85
°C
-220
-200
-180
mV
CLM( - ) Terminal Source Current
ISOURCE(CLM - )
V(CLM - )
-170
-125
-90
µA
CLM( - ) Terminal Duty Time
tD(CLM - )
170
nS
CLM(+ ) Terminal Threshold Voltage
VTH(CLM +)
TA = - 5 to + 85
°C
180
200
220
mV
CLM(+ ) Terminal Source Current
ISOURCE(CLM +)
V(CLM +) = 0V
-270
-205
-140
µA
CLM(+ ) Terminal Duty Time
tD(CLM +)
-
-
-
130
nS
OSCILLATOR SECTION
Operation Frequency
f
RT-ON = 17K
RT-OFF = 20K
CF = 220pF
TA = - 5 to + 85
°C
170
188
208
KHz
Maximum On Duty
DON(MAX)
TA = - 5 to + 85
°C47
50
53
%
Upper Limit Voltage of Oscillation
Waveform
VL(OSC)
-
3.97
4.37
4.77
V
Lower Limit Voltage of
Oscillation Waveform
VL(OSC)
-
1.76
1.96
2.16
V
Voltage Difference Between
Upper Limit and Lower Limit
∆V(OSC)
-
2.11
2.41
2.71
V
VF SECTION
OSC. Frequency at CLM Operating
fVF
VVF = 5V, RT-ON = 17K
RT-OFF = 20K
CF = 220pF
170
188
207
KHz
VF = 2V, RT-ON = 17V
RT-OFF = 20K
CF = 220pF
108
124
143
KHz


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