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參數(shù)資料
| 型號： | TPS54327DDAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 5.7 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | GREEN, PLASTIC, MS-012BA, SOP-8 |
| 文件頁數(shù)： | 4/18頁 |
| 文件大小： | 399K |
| 代理商： | TPS54327DDAR |
V
IN(max)
OUT
=
x
IPP
V
L
x
IN(max)
O
SW
-
I
f
lpp
=
+
Ipeak
O
2
I
2
=
IPP
Lo(RMS)
O
1
+
12
I
IN
OUT
=
Co(RMS)
IN
O
SW
V
x (V
- V
)
12 x V
x L
x
I
f
SLVSAG1 – NOVEMBER 2010
www.ti.com
Table 1. Recommended Component Values
Output Voltage (V)
R1 (k
Ω)
R2 (k
Ω)
C4 (pF)
L1 (H)
C8 + C9 (F)
1
6.81
22.1
1.5
22 - 68
1.05
8.25
22.1
1.5
22 - 68
1.2
12.7
22.1
1.5
22 - 68
1.8
30.1
22.1
5 - 22
2.2
22 - 68
2.5
49.9
22.1
5 - 22
2.2
22 - 68
3.3
73.2
22.1
5 - 22
2.2
22 - 68
5
124
22.1
5 - 22
3.3
22 - 68
6.5
165
22.1
5 - 22
3.3
22 - 68
Since the DC gain is dependent on the output voltage, the required inductor value will increase as the output
voltage increases. For higher output voltages above 1.8 V, additional phase boost can be achieved by adding a
feed forward capacitor (C4) in parallel with R1
The inductor peak-to-peak ripple current, peak current and RMS current are calculated using Equation 4,
Equation 5 and Equation 6. The inductor saturation current rating must be greater than the calculated peak
current and the RMS or heating current rating must be greater than the calculated RMS current. Use 700 kHz for
fSW.
Use 700 kHz for fSW. Make sure the chosen inductor is rated for the peak current of Equation 5 and the RMS
current of Equation 6.
(4)
(5)
(6)
For this design example, the calculated peak current is 3.47 A and the calculated RMS current is 3.01 A. The
inductor used is a TDK SPM6530-1R5M100 with a peak current rating of 11.5 A and an RMS current rating of 11
A.
The capacitor value and ESR determines the amount of output voltage ripple. The TPS54327 is intended for use
with ceramic or other low ESR capacitors. Recommended values range from 22uF to 68uF. Use Equation 7 to
determine the required RMS current rating for the output capacitor.
(7)
For this design two TDK C3216X5R0J226M 22uF output capacitors are used. The typical ESR is 2 m
Ω each.
The calculated RMS current is .271A and each output capacitor is rated for 4A.
Input Capacitor Selection
The TPS54327 requires an input decoupling capacitor and a bulk capacitor is needed depending on the
application. A ceramic capacitor over 10 mF is recommended for the decoupling capacitor. An additional 0.1 F
capacitor from pin 14 to ground is recommended to improve the stability of the over-current limit function. The
capacitor voltage rating needs to be greater than the maximum input voltage.
Bootstrap Capacitor Selection
A 0.1 F. ceramic capacitor must be connected between the VBST to SW pin for proper operation. It is
recommended to use a ceramic capacitor.
VREG5 Capacitor Selection
A 1-F. ceramic capacitor must be connected between the VREG5 to GND pin for proper operation. It is
recommended to use a ceramic capacitor.
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS54327
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