Voltage Regulators
I Application Notes (continued)
[2] Main characteristics
Timing capacitance Oscillator frequency
1M
100k
RT = 3 kΩ
RT = 7.5 kΩ
10k
10p
1n
CT (F)
RT = 33 kΩ
10n
DT3 pin voltage Maximum on-duty
100
90
80
f = 190 kHz
70
f = 1 MHz
60
50
40
30
20
10
0
0.2
0.3
0.4
0.5
0.6
0.7
0.8
VDT3 (V)
fOSC Maximum output duty
95
RT = 7.5 kΩ
90
85
Du3
Du1 , Du2
80
75
10k
100k
1M
fOSC (Hz)
AN8049SH
DT1 and DT2 pin voltage Maximum on-duty
100
90
80
f = 190 kHz
70
60
f = 1 MHz
50
40
30
20
10
0
0.2
0.3
0.4
0.5
0.6
0.7
0.8
VDT (V)
fOSC Maximum output duty
95
RT = 3 kΩ
90
Du3
85
Du1 , Du2
80
75
10k
100k
1M
fOSC (Hz)
fOSC Maximum output duty
95
RT = 33 kΩ
Du2
90
Du3
Du1
85
80
75
10k
100k
fOSC (Hz)
1M
13