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LM5176PWPR Datasheet(PDF) 26 Page - Texas Instruments

Part # LM5176PWPR
Description  LM5176 55-V Wide VIN Synchronous 4-switch Buck-boost Controller
PDF  45 Pages
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Manufacturer  TI2 [Texas Instruments]
Direct Link  https://www.ti.com
Logo TI2 - Texas Instruments

LM5176PWPR Datasheet(HTML) 26 Page - Texas Instruments

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2
OUT
COND(QH1)
OUT
DSON(QH1)
IN
V
P
I
R
V
§
·
˜
˜
¨
¸
©
¹
(31)
SW(QH1)
IN
OUT
r
f
sw
1
P
V
I
t
t
F
2
˜
˜
˜
˜
(32)
The rise (tr) and the fall (tf) times are based on the MOSFET data sheet information or measured in the lab.
Typically, a MOSFET with smaller RDSON (smaller conduction loss) will have longer rise and fall times (larger
switching loss).
The power loss in QL1 in the buck mode of operation is shown in Equation 33:
2
OUT
COND(QL1)
OUT
DSON(QL1)
IN
V
P
1
I
R
V
§
·
˜
˜
¨
¸
©
¹
(33)
8.2.2.13 MOSFETs QH2 and QL2
The output side MOSFETs QH2 and QL2 see the output voltage of 12 V and additional transient spikes at SW2
during switching. Therefore, QH2 and QL2 should be rated for 20 V or more. The gate plateau voltages of the
MOSFETs should be smaller than the minimum input voltage of the converter, otherwise the MOSFETs may not
fully enhance during start-up or overload conditions.
The power loss in QH2 in buck mode of operation is approximated by:
2
COND(QH2)
OUT
DSON(QH2)
P
I
R
˜
(34)
The power loss in QL2 in the boost mode of operation consists of both conduction and switching loss
components given by Equation 35 and Equation 36, respectively:
2
OUT
IN
COND(QL2)
OUT
DSON(QL2)
OUT
IN
V
V
P
1
I
R
V
V
§
· §
·
˜
˜
˜
¨
¸ ¨
¸
©
¹
©
¹
(35)
OUT
SW(QL2)
OUT
OUT
r
f
sw
IN
V
1
P
V
I
t
t
F
2
V
§
·
˜
˜
˜
˜
˜
¨
¸
©
¹
(36)
The rise (tr) and the fall (tf) times can be based on the MOSFET data sheet information or measured in the lab.
Typically, a MOSFET with smaller RDSON (lower conduction loss) has longer rise and fall times (larger switching
loss).
The power loss in QH2 in the boost mode of operation is shown in Equation 37:
2
OUT
IN
COND(QH2)
OUT
DSON(QH2)
OUT
IN
V
V
P
I
R
V
V
§
·
˜
˜
˜
¨
¸
©
¹
(37)
8.2.2.14 Frequency Compensation
This section presents the control loop compensation design procedure for the LM5176 buck-boost controller. The
LM5176 operates mainly in buck or boost modes, separated by a transition region, and therefore, the control
loop design is done for both buck and boost operating modes. Then, a final selection of compensation is made
based on the mode that is more restrictive from a loop stability point of view. Typically, for a converter designed
to go deep into both buck and boost operating regions, the boost compensation design is more restrictive due to
the presence of a right half plane zero (RHPZ) in the boost mode.
The boost power stage output pole location is given by:
LM5176
SNVSAI1D – JUNE 2017 – REVISED AUGUST 2021
www.ti.com
26
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