HA17L431ALP Datasheet, PDF (8/13 Pages) Hitachi Semiconductor – High-Precision Variable Shunt Regulators

HA17L431/HA17L431A Series
Noise Recovery Characteristics of HA17L431A and HA17L431
The HA17L431A bettered V_KA and Vref recovery time against the HA17L431 when it was inputted noise.
15 V
12 kΩ
Input pulse
1V
0V
50 ms
220 pF
(External)
Pulse
generator
680 Ω
V_KA
(Cathode)
(REF)
Shunt _(Anode)
Regulators
7.5 kΩ
0.1 µF
Vref
4.7 kΩ
Vout
220 µF
Figure 1 Noise Response Characteristics Measurement Circuit
Tek Run: 25.0MS/s
Sample Trig?
[⋅⋅⋅⋅⋅T⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅]
T
Input Noise
1
Tek Run: 25.0MS/s
Sample Trig?
[⋅⋅⋅⋅⋅T⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅]
T
Input Noise
1
V_KA
V_KA
Vref
Vref
2
2
Ch1 500mV
Ch3 1.00 V
Ch2 1.00 V M 2.00µs Ch2
Waveform of HA17L431A
2.46 V
Ch1 500mV
Ch3 1.00 V
Ch2 1.00 V M 2.00µs Ch2
Waveform of HA17L431
Figure 2 Noise Recovery Characteristics
2.46 V
8