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TPS7A4001MDGNREP Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS7A4001MDGNREP
Description  100-V Input Voltage, 50-mA, Very High Voltage Linear Regulator
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

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Where:
V
OUT
R + R
1
2
≥10 µA, and
V
OUT
V
REF
– 1
R = R
1
2
TPS7A4001-EP
OUT
FB
GND
C
10 µF
IN
R
1
C
10 nF
BYP
C
10 F
OUT
µ
IN
EN
V
IN
V
OUT
R
2
V
EN
TPS7A4001-EP
www.ti.com
SBVS226 – AUGUST 2015
8.2 Typical Application
Figure 14. Example Circuit to Maximize Transient Performance
8.2.1 Design Requirements
For this design example, use the following parameters listed in Table 2.
Table 2. Design Parameters
PARAMETER
VALUE
VIN
12 V, with 55 V surge tolerance
VOUT
5 V (ideal), 4.981 (actual)
IOUT
28 mA
Accuracy
5 %
R1, R2
162 k
Ω, 49.9 kΩ
8.2.2 Detailed Design Procedure
The maximum value of total feedback resistance can be calculated to be 500 k
Ω. Equation 1 was used to
calculate R1 and R2, and standard 1% resistors were selected to keep the accuracy within the 5% allocation. 10-
uF ceramic input and output capacitors were selected, along with a 10-nF bypass capacitor for optimal AC
performance.
8.2.2.1 Capacitor Recommendations
Low equivalent series resistance (ESR) capacitors should be used for the input, output, and bypass capacitors.
Ceramic capacitors with X7R and X5R dielectrics are required. Ceramic X7R capacitors offer improved voltage
and temperature coefficients, while ceramic X5R capacitors are the most cost-effective and are available in
higher values.
NOTE
High ESR capacitors may degrade PSRR.
8.2.2.2 Input and Output Capacitor Requirements
The TPS7A4001-EP device high voltage linear regulator achieves stability with a minimum output capacitance of
4.7 µF and input capacitance of 1 µF; however, TI highly recommends to use 10-
μF output and input capacitors
to maximize AC performance.
8.2.2.3 Bypass Capacitor Requirements
Although a bypass capacitor (CBYP) is not needed to achieve stability, TI highly recommends using a 10-nF
bypass capacitor to maximize AC performance (including line transient, noise, and PSRR). For additional
information regarding the performance improvements of using a bypass capacitor, see .
8.2.2.4 Transient Response
As with any regulator, increasing the size of the output capacitor reduces overshoot and undershoot magnitude
but increases the duration of the transient response.
The presence of the CBYP capacitor may greatly improve the line transient response of the TPS7A4001-EP
device, as shown in Figure 1.
Copyright © 2015, Texas Instruments Incorporated
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