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LM5122MHX/NOPB Datasheet(PDF) 28 Page - Texas Instruments

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Part # LM5122MHX/NOPB
Description  Wide-Input Synchronous Boost Controller
PDF  49 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM5122MHX/NOPB Datasheet(HTML) 28 Page - Texas Instruments

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LM5122, LM5122-Q1
SNVS954G – FEBRUARY 2013 – REVISED MAY 2016
www.ti.com
Product Folder Links: LM5122 LM5122-Q1
Submit Documentation Feedback
Copyright © 2013–2016, Texas Instruments Incorporated
Application Information (continued)
Table 2. Boost Regulator Frequency Analysis (continued)
SIMPLIFIED FORMULA
COMPREHENSIVE FORMULA(1)
(3)
Assuming
,
,
,
, and
.
(4)
The frequency at which 45º phase shift occurs in modulator phase characteristics.
Sub-harmonic double pole
Not considered
or
K factor
K = 1
FEEDBACK TRANSFER
FUNCTION
Feedback DC gain
Mid-band Gain
Low frequency zero
High frequency pole
OPEN LOOP RESPONSE
Crossover frequency (3)
(Open loop band width)
Use graphic tool
Maximum cross over
frequency(4)
or
, whichever is smaller
8.1.3 Interleaved Boost Configuration
Interleaved operation offers many advantages in single output, high current applications such as higher
efficiency, lower component stresses and reduced input and output ripple. For dual phase interleaved operation,
the output power path is split reducing the input current in each phase by one-half. Ripple currents in the input
and output capacitors are reduced significantly since each channel operates 180 degrees out of phase from the
other. Shown in Figure 30 is a normalized (IRMS/IOUT) output capacitor ripple current vs duty cycle for both a
single phase and dual phase boost converter, where IRMS is the output current ripple RMS.



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