HA17723 データシートの表示（PDF） - Hitachi -> Renesas Electronics
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HA17723 Datasheet PDF : 17 Pages
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HA17723/F/P
R1
2.15kΩ
R2
5.0kΩ
VIN
R3
60Ω
VCC VC
VREF VOUT
CL
CS
VIN(+) VIN(–)
VEE COMP C1
1nF
Q
RSC
0.4Ω
VOUT
Figure 5 Increasing Output Current (2)
Fixed Voltage Source in Parallel Control
Figure 6 shows the circuit of a fixed voltage source in parallel control.
R1
2kΩ
R2
5kΩ
VIN
VCC
VREF
VC
VOUT
VZ
CL
R3
100Ω
CS
VIN(–)
VEE COMP C1
5nF
R4
100Ω
Q1
VOUT
Figure 6 Fixed Voltage Source in Shunt Regulator
Switching Regulator
Figure 7 shows a switching regulator circuit. The error amplifier, control circuit, and forward feedback
circuit R4 and R3 operate in together as a comparator, and make the external transistors Q1 and Q2 to turn
on/off. In this circuit, the self-oscillation stabilizes the output voltage and the change in output is absorbed
by the changes of the switches conducting period.
Figures 8 and 9 show a negative voltage switching regulator circuit and its characteristics.
7
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