Fujitsu MB39A104 Manuale Utente Scaricare il pdf (Pagina 13)

MB39A104

■

SETTING THE OUTPUT VOLTAGE

■

SETTING THE TRIANGULAR OSCILLATION FREQUENCY

The triangular oscillation frequency is determined by the timing capacitor (CT) connected to the CT terminal (pin

13), and the timing resistor (R

T) connected to the RT terminal (pin 12).

Moreover, it shifts more greatly than the caluculated values according to the constant of timing resistor (R

T) when

the triangular wave oscillation frequency exceeds 1 MHz. Therefore, set it referring to “Triangular Wave Oscillation

Frequency vs. Timing Resistor” and “Triangular Wave Oscillation Frequency vs. Timing Capacitor” in “■ TYPICAL

CHARACTERISTICS”.

Triangular oscillation frequency : f

OSC

−

(CS2)

CS1

(−INE2)

−INE1

1.24 V

Error Amp

1.24

VO (V) =

(R1 + R2)

• Output Voltage Setting Circuit

fOSC (kHz) :=

1200000

T (pF) •RT (kΩ)

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 35 36

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Fujitsu MB39A104 Manuale Utente Pagina 13