ADP194 Ver la hoja de datos (PDF) - Analog Devices
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ADP194 Datasheet PDF : 12 Pages
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ADP194
TIMING
Turn-on delay is defined as the delta between the time that EN
reaches >1.1 V until VOUT rises to ~10% of its final value. The
ADP194 includes circuitry to set the typical 1.5 μs turn-on delay
at 3.6 V VIN to limit the VIN inrush current. As shown in Figure 20,
the turn-on delay is dependent on the input voltage.
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
VEN
VIN = 1.5V
VIN = 1.8V
VIN = 2.5V
VIN = 3.6V
20
40
60
80
100
TIME (µs)
Figure 20. Typical Turn-On Delay Time with Varying Input Voltage
The rise time of VOUT is defined as the time delta between the
10% and 90% points of VOUT as it transitions to its final value.
It is dependent on the RC time constant where C = load capacit-
ance (CLOAD) and R = RDSON||RLOAD. Because RDSON is usually
smaller than RLOAD, an adequate approximation for RC is RDSON ×
CLOAD. The ADP194 does not need any input or load capacitor,
but capacitors can be used to suppress noise on the board. If
significant load capacitance is connected, inrush current may
be a concern.
VEN
3
VOUT
1
LOAD CURRENT
2
CH1 500mV BW CH2 200mA Ω BW M20.0µs A CH3
CH3 1.00V BW
T 10.00%
400mV
Figure 21. Typical Rise Time and Inrush Current with VIN = 1.8 V, CLOAD = 1 μF
Data Sheet
VEN
3
VOUT
LOAD CURRENT
1
2
CH1 1.00V BW CH2 200mA Ω BW M4.00µs A CH3
CH3 1.00V BW
T 10.00%
400mV
Figure 22. Typical Rise Time and Inrush Current with VIN = 3.6 V, CLOAD = 1 μF
The fall time or turn-off time of VOUT is defined as the time
delta between the 90% and 10% points of VOUT as it transi-
tions to its final value. The turn-off time is also dependent on
the RC time constant.
VEN
3
VOUT
1
LOAD CURRENT
2
CH1 500mV BW CH2 200mA Ω BW M2.00µs A CH3
CH3 1.00V BW
T 10.00%
400mV
Figure 23. Typical Turn-Off Time, VIN = 1.8 V, RLOAD = 3.6 Ω
VEN
3
VOUT
1
LOAD CURRENT
2
CH1 1.00V BW CH2 200mA Ω BW M2.00µs A CH3
CH3 1.00V BW
T 10.00%
400mV
Figure 24. Typical Turn-Off Time, VIN = 3.6 V, RLOAD = 7.5 Ω
Rev. A | Page 10 of 12
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