HA16116 Hitachi Semiconductor, HA16116 Datasheet - Page 9

• Manufacturer Part Number: HA16116
• Description: Switching Regulator for Chopper Type DC/DC Converter
• Manufacturer: Hitachi Semiconductor

2. DC/DC Converter Output Voltage Setting and Error Amp Usage
2.1 Positive Voltage Booster (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.
2.2 Negative Voltage (V
Channel 1 is used for inverting output on both ICs.
Use
Use
V
V
O
O
= Vref
=
R
1
R
O
+ R
2
< Vref) for Inverting Output
R
R
2
1
2
R
V
R
R
Vref (V)
1
O
O
1
2
R
+ R
> V
1
R 3
R
2
4
Figure 2.1 Inverting Output
IN
R
R
V
O
1
2
) or Step-Down (V
V
Vref pin
O
Vref pin
R
3
R
+ R
3
Figure 2.1
4
IN( )1
IN(+)1
IN( )2
IN( )1
IN(+)2
1
(internal connection)
HA16116FP/FPJ, HA16121FP/FPJ
Vref
2.5 V
(V)
Vref 2.5 V
Error amp.
IN
Error amp
+
+
+
> V
O
> Vref)
CH1
CH2
CH1
9