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參數資料
| 型號： | TPS54140QDRCRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO10 |
| 封裝： | GREEN, PLASTIC, SON-10 |
| 文件頁數： | 33/50頁 |
| 文件大小： | 1602K |
| 代理商： | TPS54140QDRCRQ1 |
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BOOT
VIN
EN
SS/TR
RT/CLK
PH
GND
COMP
VSENSE
PWRGD
Input
Bypass
Capacitor
UVLO
Adjust
Resistors
SlowStart
Capacitor
Frequency
SetResistor
Compensation
Network
Resistor
Divider
Output
Inductor
Output
Capacitor
Vout
Vin
Topside
Ground
Area
Catch
Diode
RouteBootCapacitor
Traceonanotherlayerto
providewidepathfor
topsideground
ThermalVIA
SignalVIA
SLVSA24B
– OCTOBER 2009 – REVISED MARCH 2011
Layout
Layout is a critical portion of good power supply design. There are several signals paths that conduct quickly
changing currents or voltages that can interact with stray inductance or parasitic capacitance to generate noise
or degrade the power supply performance. To reduce these problems, the VIN pin should be bypassed to ground
with a low-ESR ceramic bypass capacitor with X5R or X7R dielectric. Care should be taken to minimize the loop
area formed by the bypass capacitor connections, the VIN pin, and the anode of the catch diode. See Figure 65
for a PCB layout example. The GND pin should be tied directly to the thermal pad under the IC and the exposed
thermal pad.
The thermal pad should be connected to any internal PCB ground planes using multiple vias directly under the
IC. The PH pin should be routed to the cathode of the catch diode and to the output inductor. Because the PH
connection is the switching node, the catch diode and output inductor should be located very close to the PH
pins, and the area of the PCB conductor minimized to prevent excessive capacitive coupling. For operation at full
rated load, the top side ground area must provide adequate heat dissipating area. The RT/CLK pin is sensitive to
noise so the RT resistor should be located as close as possible to the IC and routed with minimal lengths of
trace. The additional external components can be placed approximately as shown. It may be possible to obtain
acceptable performance with alternate PCB layouts; however, this layout has been shown to produce good
results and is meant as a guideline.
Figure 65. PCB Layout Example
Copyright
2009–2011, Texas Instruments Incorporated
39
Product Folder Link(s): TPS54140-Q1
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