參數(shù)資料
型號(hào)： TPS51461RGET
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24
封裝： 4 X 4 MM, GREEN, PLASTIC, QFN-24
文件頁數(shù)： 18/31頁
文件大?。?/td> 1627K
代理商： TPS51461RGET
=
=
p
C
M
0
OUT
S
R
G
1
f
150 kHz
2
C
R
p
W
p
m
=
W
0
S
OUT
C
M
f
R
2
C
150 kHz
53m
2
88 F
R
5 k
G
1mS
=
p
=
0
Z
C
f
1
f
2
R
C
10
www.ti.com
SLUSAD9 – DECEMBER 2010
Step Eight
Determine the stability based on the output capacitance COUT.
In order to achieve stable operation. The 0-dB frequency, f0 should be kept less than 1/5 of the switching
frequency (1 MHz). (See Figure 4)
where
RS = RDS(on) × GMC × RLOAD
(14)
.
(15)
Using 4, 22-F capacitors, the compensation resistance, RC can be calculated to be approximately 5 kΩ.
The purpose of the comparator capacitor (CC) is to reduce the DC component to obtain high DC feedback gain.
However, as it causes phase delay, another zero to cancel this effect at f0 is needed. This zero can be
determined by values of CC and the compensation resistor, RC.
(16)
And since RC has previously been derived, the value of CC is calculated to be 2.2 nF. In order to further boost
phase margin, a value of 3.3-nF is chosen for this reference design.
Step Nine
Select decoupling and peripheral components.
For TPS51461 peripheral capacitors use the following minimum values of ceramic capacitance. X5R or better
temperature coefficient is recommended. Tighter tolerances and higher voltage ratings are always appropriate.
V5DRV decoupling
≥ 2.2 F, ≥ 10 V
V5FILT decoupling
≥ 1 F, ≥10 V
VREF decoupling 0.22 F to 1 F,
≥ 4 V
Bootstrap capacitors
≥ 0.1 F, ≥ 10 V
Pull-up resistors on PGOOD, 100 k
Ω
Layout Considerations
Good layout is essential for stable power supply operation. Follow these guidelines for an efficient PCB layout.
Connect PGND pins (or at least one of the pins) to the thermal PAD underneath the device. Also connect
GND pin to the thermal PAD underneath the device. Use four vias to connect the thermal pad to internal
ground planes.
Place VIN, V5DRV, V5FILT and 2VREF decoupling capacitors as close to the device as possible.
Use wide traces for the VIN, VOUT, PGND and SW pins. These nodes carry high current and also serve as
heat sinks.
Place feedback and compensation components as close to the device as possible.
Keep analog signals (SLEW, COMP) away from noisy signals (SW, VBST).
Copyright 2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS51461
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