RR0816P-133-D データシートの表示（PDF） - Fujitsu

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RR0816P-133-D

2-ch DC/DC Converter IC with Overcurrent Protection

Fujitsu 

MB39A104

■ SETTING THE OUTPUT VOLTAGE

• Output Voltage Setting Circuit

VO

R1

(−INE2) 15

10

−INE1

R2

(CS2) 14

CS1

11

Error Amp

−

+

+

1.24 V

VO (V) =

1.24

(R1 + R2)

R2

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

Moreover, it shifts more greatly than the calculated values according to the constant of timing resistor (RT) 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 : fOSC

fOSC (kHz)

=:

1200000

CT (pF) × RT (kΩ)

13

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