MB3775 Datasheet, PDF (9/25 Pages) Fujitsu Component Limited. – SWITCHING REGULATOR CONTROLLER

MB3775
s HOW TO SET OUTPUT VOLTAGE
The output voltage is set using the connection shown in Fig. 5 and 6.
The error amplifiers are supplied to the internal reference voltage circuit as are the other internal circuits. The
common-mode input voltage range is from -0.2 V to +1.45 V.
When the amplifiers are operated non-inverting, tie the inverting terminal to VREF ( 1.28 V). When the amplifiers
are operated inverting, tie the non-inverting terminal to ground.
Fig. 5 -Connection of Error Amp.
Output Voltage V0 is plus
R2
V0⁺ [V0⁺ = VREF X (1 + R2/R1)]
+
R1
-
PIN 5 or PIN 12
VREF
R1
VREF
Fig. 6 -Connection of Error Amp.
Output Voltage V0 is minus
R2
V0^- [V0^- = -VREF X (R2/R1)]
-
PIN 5 or PIN 12
+
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