HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.8.0_00
S-87x Series
Seiko Instruments Inc.
37
Reference Data: Type 2
S-8750xxx Series
1. I
OUT
Dependency 2. C
L
Dependency
Ringing amount [mV]
200
150
100
50
0
0 10 20 30 40 50 60 70
C
L
=10 μF, Ta=25°C
I
OUT
[mA]
Ringing amount [mV]
200
150
100
50
0
0 10 20 30 40 50
C
L
[μF]
I
OUT
=
40 mA, Ta=25°C
3. ΔV
IN
Dependency
4. Temperature Dependency
ΔV
IN
[V]
Ringing amount [mV]
300
200
150
100
50
0
5 10 15 20 25
250
I
OUT
=40 mA, C
L
=10 μF, Ta=25°C
Remark The lower voltage is fixed at 0 V.
Overshoot
Undershoot
Ta [°C]
Ringing amount [mV]
250
200
150
100
50
0
40
20 0 20 40 60 80 100
I
OUT
=40 mA, C
L
=47 μF
S-8730xxxSeries
1. I
OUT
Dependency 2. C
L
Dependency
Ringing amount [mV]
I
OUT
[mA]
140
60
40
20
0
0 10 20 30 40 50 60 70
C
L
=10 μF, Ta=25°C
80
100
120
Ringing amount [mV]
120
0
0 10 20 30 40 50
C
L
[μF]
80
60
40
20
100
I
OUT
=40 mA, Ta=25°C
3. ΔV
IN
Dependency
4. Temperature Dependency
ΔV
IN
[V]
Ringing amount [mV]
0
0 5 10 15 20 25
140
60
40
20
80
100
120
I
OUT
=40 mA, C
L
=10 μF,
Ta=25°C
Remark The lower voltage is fixed at 0 V.
Undershoot
Overshoot
Ta [°C]
Ringing amount [mV]
0
40
20 0 20 40 60 80 100
140
60
40
80
100
120
20
I
OUT
=40 mA, C
L
=10 μF
HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
S-87x Series
Rev.8.0_00
Seiko Instruments Inc.
38
2. Load transient response characteristics due to load current fluctuation
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.
Overshoot
Load current
Output Voltage deviation
Undershoot
40 mA
50
μ
A
Figure 31 Output voltage fluctuation due to a change in the load current
VSS
VOUT
VIN
Oscilloscope
10:1 probe
R
0
*2
R
1
*1
Power
supply
S-87x
Series
C
L
*3
+
10 μF
+
*1. R
1
=
A 50
]V[V
OUT
μ
[Ω]
*2. R
0
=
mA 40
]V[V
OUT
[Ω]
*3. AL electrolytic capacitor
Figure 32 Measuring circuit
Table 22 Parameter dependency due to load current fluctuation
Series Parameter Conditions
Method to decrease
overshoot
Method to decrease
undershoot
Load current (I
OUT
) 10 to 60 mA, C
L
=10 μF Decrease Decrease
S-8750xxx,
S-8730xxx
Load capacitance (C
L
) 1 to 47 μF, I
OUT
=40 mA Increase Increase
Power supply voltage (V
IN
) (V
OUT
+1) to 24 V Increase Increase
Temperature (Ta)
40 °C to +85 °C Low temperature Low temperature
HIGH WITHSTAND-VOLTAGE VOLTAGE REGULATOR WITH RESET FUNCTION
Rev.8.0_00
S-87x Series
Seiko Instruments Inc.
39
Reference Data
S-8750xxxSeries
1. I
OUT
Dependency 2. C
L
Dependency
Ringing amount [mV]
I
OUT
[mA]
350
150
100
50
0
0 10 20 30 40 50 60 70
200
250
300
C
L
=10 μF, Ta=25°C, V
IN
=10 V
Remark The lower current is fixed at 50 μA.
Ringing amount [mV]
800
0
0 10 20 30 40 50
C
L
[μF]
700
600
500
400
300
200
100
V
IN
=10 V, Ta=25°C
3. ΔV
IN
Dependency
4. Temperature Dependency
V
IN
[V]
Ringing amount [mV]
0
0 5 10 15 20 25
300
250
200
150
100
50
C
L
=10 μF, Ta=25°C
Overshoot
Undershoot
Ta [°C]
Ringing amount [mV]
0
40
20 0 20 40 60 80 100
C
L
=10 μF, V
IN
=10 V
300
250
200
150
100
50
S-8730xxxSeries
1. I
OUT
Dependency 2. C
L
Dependency
Ringing amount [mV]
I
OUT
[mA]
0
0 10 20 30 40 50 60 70
300
250
200
150
100
50
C
L
=10 μF, Ta=25°C, V
IN
=10 V
Remark The lower current is fixed at 50 μA.
Ringing amount [mV]
0
0
C
L
[μF]
700
300
200
100
400
500
600
10 20 30 40 50
V
IN
=10 V, Ta=25°C
3. ΔV
IN
Dependency
4. Temperature Dependency
V
IN
[V]
Ringing amount [mV]
0
0 5 10 15 20 25
300
250
200
150
100
50
C
L
=10 μF, Ta=25°C
Overshoot
Undershoot
Ta [°C]
Ringing amount [mV]
0
40
20 0 20 40 60 80 100
C
L
=10 μF, V
IN
=10 V
300
250
200
150
100
50

S-873330EUP-APBT2G

Mfr. #:
Manufacturer:
ABLIC
Description:
Supervisory Circuits COMPOSITE POWER IC
Lifecycle:
New from this manufacturer.
Delivery:
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