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MB39A104 Datasheet, PDF (13/36 Pages) Fujitsu Component Limited. – 2-ch DC/DC Converter IC | |||
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MB39A104
s SETTING THE OUTPUT VOLTAGE
⢠Output Voltage Setting Circuit
VO
R1
(âINE2) 15
10
âINE1
R2
(CS2) 14
CS1
11
Error Amp
â
+
+
1.24 V
VO (V) =
1.24
(R1 + R2)
R2
s 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 caluculated values according to the constant of timing resistor (RT) when
the triangular wave oscillation frequency exceeds 1 MHz. Therefore, set it referring to âTriangular Wave Oscillation
Frequency vs. Timing Resistorâ and âTriangular Wave Oscillation Frequency vs. Timing Capacitorâ in âs TYPICAL
CHARACTERISTICSâ.
Triangular oscillation frequency : fOSC
fOSC (kHz) =:
1200000
CT (pF) â¢RT (kâ¦)
13
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