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参数资料
| 型号： | TPS54872PWP |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 12 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | GREEN, PLASTIC, HTSSOP-28 |
| 文件页数： | 20/21页 |
| 文件大小： | 588K |
| 代理商： | TPS54872PWP |
TPS54872
SLVS436C JULY 2002 REVISED FEBRUARY 2005
www.ti.com
8
APPLICATION INFORMATION
Figure 7 shows the schematic diagram for a typical
TPS54872 application. The TPS54872 (U1) can provide
up to 8 A of output current at a nominal output voltage of
one half of V(DDQ) (typically 1.25 V). For proper operation,
the
PowerPAD
underneath
the
integrated
circuit
TPS54872 is soldered directly to the printed-circuit board.
Figure 7. Application Circuit
VIN
C4
10
F
R2
10 k
C2
470 pF
C1
12 pF
R 3
301
R1
10 k
C3
470 pF
C12
1
F
C11
22
F
C9
22
F
C7
22
F
VTTQ
L1
0.65
H
C5
3300 pF
R4
2.4 W
U1
TPS54872PWP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
AGND
VSENSE
COMP
STATUS
BOOT
PH
RT
ENA
REFIN
VBIAS
VIN
PGND
C6
0.047
F
PwrPad
C8
10
F
C10
1
F
R 5
71.5 k
R 7
10 k
R 6
10 k
C14
0.1
F
C13
0.1
F
VDDQ
COMPONENT SELECTION
The values for the components used in this design
example were selected for good transient response and
small PCB area. Ceramic dielectric capacitors are utilized
in the output filter circuit. A small size, small value output
inductor is also used. Compensation network components
are chosen to maximize closed loop bandwidth and
provide
good
transient
response
characteristics.
Additional design information is available at www.ti.com.
INPUT VOLTAGE
The input voltage is a nominal 5.0 VDC. The input filter
(C4) is a 10-
F ceramic capacitor (Taiyo Yuden).
Capacitor C8, a 10-
F ceramic capacitor (Taiyo Yuden)
that provides high frequency decoupling of the TPS54872
from the input supply, must be located as close as possible
to the device. Ripple current is carried in both C4 and C8,
and the return path to PGND should avoid the current
circulating in the output capacitors C7, C9, C11, and C12.
FEEDBACK CIRCUIT
The values for these components are selected to provide
fast transient response times. Components R1 R2, R3,
C1, C2, and C3 forms the loop compensation network for
the circuit. For this design, a type 3 topology is used. The
transfer function of the feedback network is chosen to
provide maximum closed loop gain available with open
loop characteristics of the internal error amplifier. Closed
loop cross-over frequency is typically between 80 kHz and
125 kHz for input from 4 V to 6 V.
OPERATING FREQUENCY
In the application circuit, RT is grounded through a 71.5 k
resistor to select the operating frequency of 700 kHz. To
set a different frequency, place a 68-k
to 180-k resistor
between RT (pin 28) and analog ground or leave RT
floating to select the default of 350 kHz. The resistance can
be approximated using the following equation:
R
+
500 kHz
Switching Frequency
100 [k
W]
(1)
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