KA5X03XX-SERIES
Typical Performance Characteristics (Control Part) (Continued)
(These characteristic graphs are normalized at Ta = 25°C)
Fig.2 Feedback Source Current
Fig.1 Operating Frequency
1.2
1.15
1.1
1.2
1.15
1.1
1.05
1.05
Ifb
1
0.95
0.9
Fosc
1
0.95
0.9
0.85
0.8
0.85
0.8
-25
0
25
50
75 100 125 150
-25
0
25 50 75 100 125 150
Figure 2. Feedback Source Current
Figure 1. Operating Frequency
Fig.3 Operating Current
Fig.4 MaxInductor Current
1.1
1.2
1.15
1.1
1.05
Ipeak 1
I
1.05
over
0.95
Iop
1
0.95
0.9
0.85
0.8
0.9
0.85
0.8
-25
0
25 50
75 100 125 150
-25
0
25 50 75 100 125 150
Figure 4. Peak Current Limit
Figure 3. Operating Supply Current
Fig.5 Start up Current
Fig.6 Start Threshold Voltage
1.5
1.15
1.1
1.3
1.1
0.9
0.7
0.5
1.05
Istart
Vstart
1
0.95
0.9
0.85
-25
0
25 50 75 100 125 150
-25
0
25 50 75 100 125 150
Figure 6. Start Threshold Voltage
Figure 5. Start up Current
13
FAIRCHILD [ FAIRCHILD SEMICONDUCTOR ]
