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TPS73201DBVR датащи(PDF) 17 Page - Texas Instruments

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номер детали TPS73201DBVR
подробное описание детали  TPS732 Capacitor-Free, NMOS, 250mA, Low-Dropout Regulator With Reverse Current Protection
PDF  49 Pages
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производитель  TI [Texas Instruments]
домашняя страница  http://www.ti.com
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TPS73201DBVR датащи(HTML) 17 Page - Texas Instruments

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VO
1.2V
1.5V
1.8V
2.5V
2.8V
3.0V
3.3V
R1
Short
23.2kW
28.0kW
39.2kW
44.2kW
46.4kW
52.3kW
R2
Open
95.3kW
56.2kW
36.5kW
33.2kW
30.9kW
30.1kW
Table 1. Standard 1%
Resistor Values for
Common Output Voltages
NOTE: VOUT = (R1 + R2)/R2 1.204;
´
R1úú R2 @ 19kW for best
accuracy.
Servo
Error
Amp
Ref
Current
Limit
Thermal
Protection
Bandgap
OUT
FB
R
1
R
2
EN
GND
IN
80kW
8kW
27kW
4MHz
Charge Pump
Figure 6-2. Adjustable-Voltage Version
6.3 Feature Description
6.3.1 Output Noise
A precision band-gap reference is used to generate the internal reference voltage, VREF. This reference is
the dominant noise source within the TPS732 and generates approximately 32µVRMS (10Hz to 100kHz) at
the reference output (NR). The regulator control loop gains up the reference noise with the same gain as the
reference voltage, so that the noise voltage of the regulator is approximately given by:
OUT
1
N
RMS
RMS
2
REF
V
R
R2
V
32 V
32 V
R
V
æ
ö
+
=
m
´
=
m
´
ç
÷
ç
÷
è
ø
(1)
Because the value of VREF is 1.2V, this relationship reduces to:
RMS
N
RMS
OUT
V
V ( V
)
27
V
(V)
V
m
æ
ö
m
=
´
ç
÷
è
ø
(2)
An internal 27kΩ resistor in series with the noise-reduction pin (NR) forms a low-pass filter for the voltage
reference when an external noise-reduction capacitor, CNR, is connected from NR to ground. For CNR = 10nF,
the total noise in the 10Hz to 100kHz bandwidth is reduced by a factor of approximately 3.2, giving the
approximate relationship:
RMS
N
RMS
OUT
V
V ( V
)
8.5
V
(V)
V
m
æ
ö
m
=
´
ç
÷
è
ø
(3)
for CNR = 10nF.
www.ti.com
TPS732
SBVS037Q – AUGUST 2003 – REVISED SEPTEMBER 2024
Copyright © 2024 Texas Instruments Incorporated
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Product Folder Links: TPS732



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