FUJITSU MB39A105 - Manual (Page 12)

MB39A105
12
■ ■ ■ ■ SETTING THE OUTPUT VOLTAGE
■ ■ ■ ■ SETTING THE TRIANGULAR OSCILLATION FREQUENCY
The triangular oscillation frequency is determined by the timing resistor (R
T
) connected to the RT terminal (pin 7) .
Triangular oscillation frequency : fosc
−
+
+
V O
R1
R2
−
INE
CSCP
Error
Amp
(0.5 V)
V O (V) = (R1 + R2)
0.5
1
2
R2
• Output Voltage Setting Circuit
fosc (kHz) :=
3750
R
T
(k
Ω
)