KA7577D Fairchild, KA7577D Datasheet - Page 4

• Manufacturer Part Number: KA7577D
• Description: SMPS Controller
• Manufacturer: Fairchild

KA7577
Electrical Characteristics
(V
4
Difference Voltage Between
Operating Stop and OVP Cancellation
OVER VOLTAGE PROTECTION SECTION
OVP Terminal Threshold Voltage
OVP Terminal Input Current
OVP Cancellation Voltage
TIMER SECTION
Timer Frequency
Timer Charge Current
Off Time/On Time Ratio
CURRENT LINITTING SECTION
CLM( - ) Terminal Threshold Voltage
CLM( - ) Terminal Source Current
CLM( - ) Terminal Duty Time
CLM(+ ) Terminal Threshold Voltage
CLM(+ ) Terminal Source Current
CLM(+ ) Terminal Duty Time
OSCILLATOR SECTION
Operation Frequency
Maximum On Duty
Upper Limit Voltage of Oscillation
Waveform
Lower Limit Voltage of
Oscillation Waveform
Voltage Difference Between
Upper Limit and Lower Limit
V
OSC. Frequency at CLM Operating
CC
F
=18V, T
SECTION
A
=25 C, unless otherwise specified)
Parameter
I
I
SOURCE(CLM - )
SOURCE(CLM +)
I
V
CHG(TIMER)
V
V
V
D
t
V
t
CC(OVPC)
Symbol
f
TH(CLM - )
TH(CLM +)
D(CLM - )
V
V
D(CLM +)
(TIMER)
TH(OVP)
I
ON(MAX)
CC(OVP)
I(OVP)
V
L(OSC)
L(OSC)
f
(OSC)
K
VF
f
T
T
T
T
V
T
V
R
R
C
T
T
V
R
C
V
R
C
A
A
A
A
A
A
A
(CLM - )
(CLM +)
VF
F
T-ON
T-OFF
F
T-OFF
F
T-OFF
F
= -5 C
= 25 C
= 85 C
= - 5 to + 85 C
= - 5 to + 85 C
= - 5 to + 85 C
= - 5 to + 85 C
= 2V, R
= 220pF
= 220pF
= 220pF
= 5V, R
Conditions
= 17K
= 20K
= 20K
= 20K
= 0V
-
-
-
-
-
-
-
-
-
-
T-ON
T-ON
= 17V
= 17K
Min.
0.65
0.27
-193
-178
-147
-220
-170
-270
3.97
1.76
2.11
180
170
170
108
1.0
7.6
7.0
47
-
-
Typ. Max.
-138
-127
-105
-200
-125
-205
4.37
1.96
2.41
170
200
188
188
124
1.4
1.2
8.6
1.3
0.4
8.7
50
-
-102
-180
-140
11.0
4.77
2.16
2.71
220
130
208
207
143
-94
-78
-90
1.8
3.6
0.6
53
-
-
Unit
KHz
KHz
KHz
mV
mV
nS
nS
Hz
%
V
V
V
V
V
V
-
A
A
A
A