S-8425AAAFT-TB-X Datasheet, PDF (15/45 Pages) Seiko Instruments Inc – BATTERY BACKUP SWITCHING IC

Rev.3.1_01
BATTERY BACKUP SWITCHING IC
S-8425 Series
 Transient Response
1. Line Transient Response Against Input Voltage Variation
The input voltage variation differs depending on whether the power supply input (0 V→10 V square wave) is
applied or the power supply variation (6 V↔10 V square waves) is applied. This section describes the
ringing waveforms and parameter dependency of each type. The test circuit is shown for reference.
Power supply application: 0 V→10 V square wave
10 V
Input voltage ^{0 V}
Output voltage
Overshoot
Undershoot
Fast amplifier
P.G.
VIN
S-8425
Series ^VOUT
VSS
COUT
Oscillo-
scope
RL
Figure 10 Power Supply Application:
0 V→10 V Square Wave
Power Supply Application
VOUT pin
COUT = 22 μF, I_OUT = 50 mA, Ta = 25°C
10V
0V
Input voltage
(5 V/div)
Figure 11 Test Circuit
VRO pin
CRO = 22 μF, I_RO = 30 mA, Ta = 25°C
10V
0V
Input voltage
(5 V/div)
Output voltage
(0.5 V/div)
Output voltage
(0.5 V/div)
Figure 12
t (100 μs/div)
Ringing Waveform of Power
Supply Application (VOUT Pin)
VCH pin
CCH = 10 μF, I_CH = 10 mA, Ta = 25°C
10V
0V
Input voltage
(5 V/div)
Figure 13
t (100 μs/div)
Ringing Waveform of Power
Supply Application (VRO Pin)
Output voltage
(0.5 V/div)
Figure 14
t (100 μs/div)
Ringing Waveform of Power
Supply Application (VCH Pin)
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