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参数资料
| 型号： | V62/06657-05XE |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 6.5 A SWITCHING REGULATOR, 762 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | GREEN, PLASTIC, HTSSOP-20 |
| 文件页数： | 20/21页 |
| 文件大小： | 614K |
| 代理商： | V62/06657-05XE |
www.ti.com
APPLICATION INFORMATION
C2
RT
SS/ENA
VBIAS
PWRGD
VSENSE
1
2
3
4
5
6
7
9
VIN
PH
BOOT
PGND
PwrPAD
U1
TPS54312PWP
1
2
VO
GND
J3
C7
0.047
F
R1
10 k
C11
1000 pF
1
J1
2
1
VI
GND
+
1
Optional
71.5 k
L1
5.2
H
R7
8
10
11
12
13
14
15
16
17
18
19
20
AGND
NC
PH
FSEL
VIN
C8
10
F
C3
0.1
F
+
C9
470
F
4 V
PWRGD
INPUT VOLTAGE
FEEDBACK CIRCUIT
OPERATING FREQUENCY
R +
500 kHz
Switching Frequency
100 kW
(1)
OUTPUT FILTER
SGLS376A – FEBRUARY 2007 – REVISED MARCH 2007
Figure 10 shows the schematic diagram for a typical TPS54314 application. The TPS54314 (U1) can provide up
to 3 A of output current at a nominal output voltage of 1.8 V. For proper thermal performance, the PowerPAD
underneath the TPS54314 integrated circuit needs to be soldered to the printed circuit board.
Figure 10. TPS54314 Schematic
The input to the circuit is a nominal 5 VDC, applied at J1. The optional input filter (C2) is a 220-
F POSCAP
capacitor, with a maximum allowable ripple current of 3 A. C8 is the decoupling capacitor for the TPS54314 and
must be located as close to the device as possible.
The output voltage of the converter is fed directly into the VSENSE pin of the TPS54314. The TPS54314 is
internally compensated to provide stability of the output under varying line and load conditions.
In the application circuit, a 700 kHz operating frequency is selected by leaving FSEL open and connecting a
71.5 k
resistor between the RT pin and AGND. Different operating frequencies may be selected by varying the
value of R3 using equation 1:
Alternately, preset operating frequencies of 350 kHz or 550 kHz my be selected by leaving RT open and
connecting the FSEL pin to AGND or VIN, respectively.
The output filter is composed of a 5.2-
H inductor and 470-F capacitor. The inductor is a low dc resistance
(16-m
) type, Sumida CDRH104R-5R2. The capacitor used is a 4-V POSCAP with a maximum ESR of 40 m.
The output filter components work with the internal compensation network to provide a stable closed loop
response for the converter.
8
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