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LM5181-Q1 Folha de dados(PDF) 20 Page - Texas Instruments

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Nome de Peças LM5181-Q1
Descrição Electrónicos  LM5181-Q1 65-VIN PSR Flyback DC/DC Converter with 100-V, 0.75-A Integrated MOSFET
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
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LM5181-Q1 Folha de dados(HTML) 20 Page - Texas Instruments

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UV1
IN(off)
UV-FALLING
UV-HYST
UV1
UV2
R
536k
V
V
1
I
R
1.45 V 1
5 $
N
9
R
100k
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UV1
IN(on)
UV-RISING
UV2
R
536 k
V
V
1
1.5 V 1
9.54 V
R
100k
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: ˜
:
UV-RISING
UV2
UV1
IN(on)
UV-RISING
V
1.5 V
R
R
536 k
100 k
V
V
9.5 V 1.5 V
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:
UV-FALLING
IN(on)
IN(off)
UV-RISING
UV1
UV-HYST
V
1.45 V
V
V
9.5 V
6.5 V
V
1.5 V
R
536k
I
5 $
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FB
TC
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Diode
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158
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R
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130 k
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TC
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3
1.2
OUT
D
PS
FB
V
V
N
5 V
0.3 V
3
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158 k
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20
LM5181-Q1
SNVSBN6 – APRIL 2020
www.ti.com
Product Folder Links: LM5181-Q1
Submit Documentation Feedback
Copyright © 2020, Texas Instruments Incorporated
Substituting the input current at full load, switching frequency, peak primary current, and peak-to-peak ripple
specification gives CIN greater than 1 μF. Mindful of the voltage coefficient of ceramic capacitors, select a 2.2-µF,
100-V ceramic input capacitor with X7R dielectric in 1210 case size. Equation 25 gives the input capacitor RMS
ripple current.
(25)
9.2.1.2.8
Feedback Resistor – RFB
Select a feedback resistor, designated RFB, of 158 kΩ based on the secondary winding voltage at the end of the
flyback conduction interval (the sum of the 5-V output voltage and the Schottky diode forward voltage drop)
reflected by the transformer turns ratio of 3 : 1. The forward voltage drop of the flyback diode is 0.3 V as its
current approaches zero.
(26)
9.2.1.2.9
Thermal Compensation Resistor – RTC
Select a resistor for output voltage thermal compensation, designated RTC, based on Equation 27.
(27)
9.2.1.2.10
UVLO Resistors – RUV1, RUV2
Given VIN(on) and VIN(off) as the input voltage turn-on and turn-off thresholds of 9.5 V and 6.5 V, respectively,
select the upper and lower UVLO resistors using the following expressions:
(28)
(29)
Calculate the actual input turn-on and turn-off voltage thresholds as follows:
(30)
(31)
9.2.1.2.11
Soft-Start Capacitor – CSS
Connect an external soft-start capacitor for a specific soft-start time. In this example, select a soft-start
capacitance of 47 nF based on Equation 12 to achieve a soft-start time of 8 ms.
For technical solutions, industry trends, and insights for designing and managing power supplies, please refer to TI's Power Management
technical articles.


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