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BU31TD2WNVX 数据表(PDF) 4 Page - Rohm

部件名 BU31TD2WNVX
功能描述  1ch 200mA CMOS LDO Regulators
Download  42 Pages
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制造商  ROHM [Rohm]
网页  http://www.rohm.com
标志 ROHM - Rohm

BU31TD2WNVX 数据表(HTML) 4 Page - Rohm

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Technical Note
4/41
BU□□TD2WNVX series
www.rohm.com
2011.07 - Rev.C
© 2011 ROHM Co., Ltd. All rights reserved.
Fig.4 Stability area characteristics (Example)
0.01
0.1
1
10
100
0
50
100
150
200
IOUT [mA]
Block diagram, recommended circuit diagram, and pin configuration diagram
BU□□TD2WNVX
Input / Output terminal equivalent circuit schematic
1pin (VOUT)
2pin (GND)
3pin (STBY)
4pin (VIN)
Fig.2 Input/Output equivalent circuit
About input/output capacitor
It is recommended to place a capacitor as close as possible to
the pins between the input terminal and GND or between the
output terminal and GND.
The capacitor between the input terminal and GND becomes
valid when source impedance increases or when wiring is long.
The larger the capacity of the output capacitor between the
output terminal and GND is, the better the stability and
characteristics in output load fluctuation become.
However, please check the status of actual implementation.
Ceramic capacitors generally have variation, temperature
characteristics, and direct current bias characteristics and the
capacity value also decreases with time depending on the
usage conditions. It is recommended to select a ceramic
capacitor upon inquiring about detailed data of the related
manufacturer.
About the equivalent series resistance (ESR) of a ceramic capacitor
Capacitors generally have ESR (equivalent series resistance)
and it operates stably in the ESR-IOUT area shown on the right.
Since ceramic capacitors, tantalum capacitors, electrolytic
capacitors, etc. generally have different ESR, please check the
ESR of the capacitor to be used and use it within the stability
area range shown in the right graph for evaluation of the actual
application.
PIN No.
Symbol
Function
1
VOUT
Voltage output
2
GND
Grounding
3
STBY
ON/OFF control of output voltage
(High: ON, Low: OFF)
4
VIN
Power input
Fig.3 Capacity – bias characteristics
4
3
1
2
Cin
VIN
GND
STBY
VSTBY
VOUT VOUT
Co
VREF
OCP
STBY
Discharge
TSD
VIN
Fig.1 Recommended circuit diagram
Recommended ceramic capacitor for Cin & Co
Murata Manufacturing Co., Ltd.
GRM188B11A474KA61D
Capacity value of ceramic capacitor - DC bias characteristics
(
Example)
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
00.5
1
1.5
22.53
3.54
DC Bias Voltage [V]
10-V withstand voltage
B1characteristics
GRM188B11A105KA61D
10-V withstand voltage
B characteristics
6.3-V withstand voltage
B characteristics
4-V withstand voltage
X6S characteristics
10-V withstand voltage
F characteristics
10-V withstand voltage
F characteristics
Stable region
Unstable region
Cout=0.47μF ,CIN=0.47μF ,Temp=+25℃


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