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LMR23630AFDDA Datasheet(PDF) 13 Page - Texas Instruments

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Part # LMR23630AFDDA
Description  SIMPLE SWITCHER 36-V, 3-A Synchronous Step-Down Converter
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LMR23630AFDDA Datasheet(HTML) 13 Page - Texas Instruments

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OUT
REF
FBT
FBB
REF
V
V
R
R
V
u
VOUT
FB
RFBT
RFBB
0
50
100
150
200
250
0
500
1000
1500
2000
2500
Switching Frequency (kHz)
C008
13
LMR23630
www.ti.com
SNVSAH2C – DECEMBER 2015 – REVISED JUNE 2017
Product Folder Links: LMR23630
Submit Documentation Feedback
Copyright © 2015–2017, Texas Instruments Incorporated
Feature Description (continued)
Figure 14. RT vs Frequency Curve
Table 1. Typical Frequency Setting RT Resistance
fSW (kHz)
RT (kΩ)
200
200
350
115
500
78.7
750
53.6
1000
39.2
1500
26.1
2000
19.6
2200
17.8
8.3.3 Adjustable Output Voltage
A precision 1-V reference voltage is used to maintain a tightly regulated output voltage over the entire operating
temperature range. The output voltage is set by a resistor divider from output voltage to the FB pin. TI
recommends using 1% tolerance resistors with a low temperature coefficient for the FB divider. Select the
lowside resistor RFBB for the desired divider current and use Equation 2 to calculate high-side RFBT. RFBT in the
range from 10 k
Ω to 100 kΩ is recommended for most applications. A lower RFBT value can be used if static
loading is desired to reduce VOUT offset in PFM operation. Lower RFBT will reduce efficiency at very light load.
Less static current goes through a larger RFBT and might be more desirable when light load efficiency is critical.
However, RFBT larger than 1 MΩ is not recommended because it makes the feedback path more susceptible to
noise. Larger RFBT value requires more carefully designed feedback path on the PCB. The tolerance and
temperature variation of the resistor dividers affect the output voltage regulation.
Figure 15. Output Voltage Setting
(2)


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