HA16116FP Datasheet, PDF (9/34 Pages) Hitachi Semiconductor – Switching Regulator for Chopper Type DC/DC Converter

HA16116FP/FPJ, HA16121FP/FPJ
2. DC/DC Converter Output Voltage Setting and Error Amp Usage
2.1 Positive Voltage Booster (V_O > V_IN) or Step-Down (V_IN > V_O > Vref)
Use
V_O =
R₁ + R₂
R₂
⋅ Vref
(V)
Booster output is possible only at channel 2 of HA16121. For step-down output, both channels of
HA16116 or channel 1 of HA16121 are used.
V_O
R₁
R₂
V_O
R₁
R₂
Error amp.
IN(−)1 _−
CH1
IN(+)1 +
IN(−)2 _−
+
CH2
Vref pin
Vref
2.5 V
(internal connection)
Figure 2.1
2.2 Negative Voltage (V_O < Vref) for Inverting Output
Use V_O = −Vref ⋅
R_{1 â‹} R₃ + R_{4 − 1 (V)}
R₁ + R₂
R₃
Channel 1 is used for inverting output on both ICs.
Vref pin
R₁
R₂
R3
R₄
V_O
Vref 2.5 V
IN(−)1
−
IN(+)2 ⁺
CH1
Error amp
Figure 2.1 Inverting Output
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