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LMQ61460 bảng dữ liệu(PDF) 30 Page - Texas Instruments

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tên linh kiện LMQ61460
Giải thích chi tiết về linh kiện  LMQ61460 3-V to 36-V, 6 A, Low EMI Synchronous Step-Down Quiet Converter
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Table 8-2. Typical External Component Values
fSW
(kHz)
VOUT (V) L1 (µH)
COUT (RATED)
RFBT
(kΩ)
RFBB
(kΩ)
CBOOT
(µF)
RBOOT
(Ω)
CVCC
(µF)
CFF (pF) RFF (kΩ)
2100
3.3
1
3 × 22 µF ceramic
100
43.2
0.1
0
1
10
1
400
3.3
4.7
3 × 47 µF ceramic
100
43.2
0.1
0
1
4.7
1
2100
5
1.5
2 × 22 µF ceramic
100
24.9
0.1
0
1
22
1
400
5
4.7
2 × 47 µF ceramic
100
24.9
0.1
0
1
22
1
8.2.2 Detailed Design Procedure
The following design procedure applies to Figure 8-1 and Table 8-1.
8.2.2.1 Choosing the Switching Frequency
The choice of switching frequency is a compromise between conversion efficiency and overall solution size.
Lower switching frequency implies reduced switching losses and usually results in higher system efficiency.
However, higher switching frequency allows for the use of smaller inductors and output capacitors, hence, a
more compact design.
When choosing operating frequency, the most important consideration is thermal limitations. This constraint
typically dominates frequency selection. See Figure 8-2 for circuits running at 400 kHz and Figure 8-3 for circuits
running at 2.1 MHz. These curves show how much output current can be supported at a given ambient
temperature given these switching frequencies. Note that power dissipation is layout dependent so while these
curves are a good starting point, thermal resistance in any design will be different from the estimates used to
generate Figure 8-2 and Figure 8-3. The maximum temperature ratings are based on the LMQ61460EVM, which
is approximately 100 mm x 80 mm in board area. Unless a larger copper area or cooling is provided to reduce
the effective RθJA, if ambient temperature is 105°C and the switching frequency is set to 2.1 MHz, the load
current should typically be limited to 4 A.
Output Current (A)
3
3.5
4
4.5
5
5.5
6
85
90
95
100
105
110
115
120
125
130
snvs
VIN = 13.5 V
VIN = 16 V
VIN = 24 V
fSW = 400 kHz
PCB RθJA = 25°C/W
VOUT = 5 V
Figure 8-2. Maximum Ambient Temperature versus
Output Current
Output Current (A)
2
2.5
3
3.5
4
4.5
5
5.5
6
65
75
85
95
105
115
125
135
snvs
VIN = 13.5 V
VIN = 16 V
VIN = 24 V
fSW = 2100 kHz
PCB RθJA = 25°C/W
VOUT = 5 V
Figure 8-3. Maximum Ambient Temperature versus
Output Current
Two other considerations are what maximum and minimum input voltage the part must maintain for the
frequency setting. Since the device adjusts its frequency under conditions in which regulation would normally be
prevented by minimum on-time or minimum off-time, these constraints are only important for input voltages
requiring constant frequency operation.
If foldback is undesirable at high input voltage, use Equation 7:
LMQ61460
SNVSBR8A – JULY 2020 – REVISED AUGUST 2020
www.ti.com
30
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