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LMZM33603 Datasheet(Hoja de datos) 11 Page - Texas Instruments

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No. de Pieza. LMZM33603
Descripción  4-V to 36-V Input, 3-A Step-Down DC/DC Power Module in QFN Package
Descarga  36 Pages
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Fabricante  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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 11 page
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AGND
VOUT
FB
RFBT
RFBB
10 k
CFF
FBT
OUT
R
10
V
1 k
u
:
11
LMZM33603
www.ti.com
SNVSAO6C – SEPTEMBER 2017 – REVISED MARCH 2018
Product Folder Links: LMZM33603
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Copyright © 2017–2018, Texas Instruments Incorporated
7.3 Feature Description
7.3.1 Adjusting the Output Voltage
A resistor divider connected to the FB pin (pin 16) programs the output voltage of the LMZM33603. The output
voltage adjustment range is from 1 V to 18 V. (See Output Current vs Output Voltage for the maximum allowable
output voltage as a function of output current.) Figure 18 shows the feedback resistor connections for setting the
output voltage. The recommended value of RFBB is 10 kΩ. The value for RFBT can be calculated using
Equation 1. Depending on the output voltage, a feed-forward capacitor, CFF, may be required for optimum
transient performance. Table 1 lists the standard external RFBT and CFF values for several output voltages
between 2.5 V and 18 V. Table 2 lists the values for output voltages below 2.5 V. Additionally, Table 1 and
Table 2 include the recommended switching frequency (FSW), the frequency setting resistor (RRT), and the
minimum and maximum output capacitance for each of the output voltages listed.
For designs with RFBB other than 10 kΩ, adjust CFF and RFBT such that (CFF × RFBT) is unchanged and adjust
RFBT such that (RFBT / RFBB) is unchanged.
space
(1)
Figure 18. Setting the Output Voltage




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