S-873069CUP-AFFT2G Seiko Instruments, S-873069CUP-AFFT2G Datasheet - Page 38
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S-873069CUP-AFFT2G
Manufacturer Part Number
S-873069CUP-AFFT2G
Description
IC VOLT DETECT/REG 3.0V SOT89-5
Manufacturer
Seiko Instruments
Datasheet
1.S-872622BUP-OLAT2G.pdf
(53 pages)
Specifications of S-873069CUP-AFFT2G
Applications
Converter, Constant Voltage Power Supply
Voltage - Input
1.3 ~ 24 V
Number Of Outputs
1
Voltage - Output
3V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
SOT-89-5
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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
_00