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
Floating-Type Fixed Voltage Source
Voltage sources of the floating type or boost type are typically employed when high voltage output is
required. Figure 10 shows the circuit of a floating-type fixed voltage source. Considering the stabilization
in this circuit, assume that the output voltage increases. At the input terminal of the error amplifier the non-
inverted input will become low compared with the inverted input, and the output current of the error
amplifier decreases. Then, the current from the terminal VZ in the control circuit decreases. As a result the
base current of the external resistor Q1 will decrease and collector current will decrease, controlling
increase of the output voltage.
The output voltage VOUT in the circuit in figure 10
VOUT =
R1 + R2
R3 + R4
×
R4
R1
–1
VREF
Figure 11 is the circuit diagram of a negative fixed voltage source in floating type.
D 12 V
HZ12 H
R2
53.7kΩ
VCC
VREF
R4
3.0kΩ
R1
3.57kΩ
VIN
R5 6.2kΩ
VC 2.0W
VOUT
VZ
Q
CL
RSC
CS
1Ω
R3
3.0kΩ
VIN(+) VIN(–)
C1
VEE COMP 1nF
VOUT
Figure 10 Positive Voltage Floating Regulator
R2
97.6kΩ
R1
3.57kΩ
R5
10kΩ
D12 V
HZ12 H
R3
3kΩ
VCC
VREF
VC
VOUT
VZ
CL
CS
R4 VIN(+) VIN(–)
3kΩ VEE COMP
R6
10kΩ
C1
100pF
VIN
Q
VOUT
Figure 11 Negative Voltage Floating Regulator
10
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