s-873023cup-afct2u Seiko Instruments Inc., s-873023cup-afct2u Datasheet - Page 38

• Manufacturer Part Number: s-873023cup-afct2u
• Description: High Withstand-voltage Voltage Regulator With Reset Function
• Manufacturer: Seiko Instruments Inc.

38
HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
S-87x Series
S-8750xxx,
S-8730xxx
2. Load transient response characteristics due to load current fluctuation
Series
An overshoot and an undershoot are caused in the output voltage if the load current is changed from
50 μA to 40 mA while the input voltage is kept constant. Figure 31 shows the output voltage fluctuation
due to a change in the load current. The measuring circuit is shown in Figure 32 for reference. The
latter half of this section describes ringing waveform and parameter dependency.
*1. R
*2. R
*3. AL electrolytic capacitor
Power
supply
1
0
=
=
V
V
Output Voltage deviation
40
Load current (I
Load capacitance (C
Power supply voltage (V
Temperature (Ta)
50
OUT
OUT
mA
μ
[
[
A
Figure 31 Output voltage fluctuation due to a change in the load current
] V
] V
Table 22 Parameter dependency due to load current fluctuation
10 μF
[Ω]
[ Ω ]
Parameter
Load current
OUT
+
−
)
VIN
L
)
IN
)
50 μA
Series
S-87x
Figure 32 Measuring circuit
Seiko Instruments Inc.
10 to 60 mA, C
1 to 47 μ F, I
(V
− 40 °C to + 85 °C
VSS
OUT
+ 1) to 24 V
Conditions
VOUT
OUT
L
= 40 mA
= 10 μ F
R
1
*1
R
0
Method to decrease
*2
40 mA
Low temperature
overshoot
Decrease
Increase
Increase
+
−
C
Overshoot
Undershoot
L
*3
Method to decrease
Low temperature
Oscilloscope
10:1 probe
undershoot
Decrease
Increase
Increase
Rev.8.0
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