HA16103 Datasheet, PDF (5/21 Pages) Hitachi Semiconductor – Watchdog Timer

HA16103 FPJ/FPK
Functional Description
Stabilized Power Supply Function
The stabilized power supply includes the following features:
• Wide range of operating input voltage from 6 V to 40 V to provide stabilized voltages
• Availability of any output current, by simply replacing the external transistor
• Fine adjustment of output voltage
Figure 1 shows the fine adjustment circuit of the output circuit. Select the resistor R1 as shown in
equation 1.
Add a resistor between GND and Voadj to increase the output voltage.
V_BATT
Q1
V_CC
GND
V_CONT V_OUT
HA16103
To micro-
R₁
C1
computer system
100 µF
Vout
=
(1+
5.34
R1 // 2.0
) × Voadj
⋅
⋅
⋅
⋅
Equation
1
(R₁: kΩ)
(Voadj 1.31V)
Figure 1 Fine Adjustment Circuit of Output Voltage
5
I _OUT = 0.1 A
0.5 A
4
1A
3
2
1
(Ta = 25°C)
0
5
10
Input voltage V_CC (V)
Figure 2 Output Voltage Characteristic
5