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| 型號(hào)： | TPS65171RHAR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4 A SWITCHED CAPACITOR REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封裝： | 6 X 6 MM, GREEN, PLASTIC, MO-220VJJD-2, VQFN-40 |
| 文件頁數(shù)： | 18/46頁 |
| 文件大小： | 3644K |
| 代理商： | TPS65171RHAR |
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logic
FB2
R5
V
= V
1+
= 1.24 V
1+
R6
÷
÷
è
è
FB2
V
1.24 V
R6 =
=
1.2 k
1mA
1 mA
W
logic
FB2
V
R5 = R6
1 = R6
1
V
1.24 V
-
-
÷
÷
÷
÷
è
è
www.ti.com
SLVSA22A – OCTOBER 2009 – REVISED JANUARY 2010
Usually a Schottky diode with a 1A maximum average rectified forward current rating is sufficient for most
applications. The Schottky rectifier can be selected with lower forward current capability depending on the output
current Iout, but has to be able to dissipate the power. The dissipated power is the average rectified forward
current times the diode forward voltage. The efficiency rises with lower forward voltage.
PD = Iavg × Vforward
(17)
Table 7. Rectifier Diode Selection (Buck Converter)
Vr/Iavg
Vforward
RqJA
SIZE
COMPONENT SUPPLIER
20V/1A
0.46V at 1A
20°C/W
SMA
B120, DIODES Incorporated
20V/0.5A
0.44V at 0.5A
150°C/W
SOT123
MBR0520, International Rectifier
20V/1A
0.32V at 1A
60°C/W
PowerDI 123
DFLS120L, DIODES Incorporated
Output Capacitor Selection (Buck Converter)
For best output voltage filtering, low ESR ceramic output capacitors are recommended. Two 22mF or four 10mF
ceramic output capacitors with sufficient voltage rating in parallel are adequate for most applications. Additional
capacitors can be added to improve the load transient regulation. See Table 8 for output capacitor selection.
Table 8. Output Capacitor Selection (Buck Converter)
CAPACITOR
COMPONENT SUPPLIER
22mF/6.3V
Murata, GRM31CR60J226KE19
10mF/6.3V
Murata, GRM21BR70J106KE76
47mF/6.3V
Murata, GRM32ER60J476ME20
10mF/6.3V
Taiyo Yuden, JWK212BJ106MD
Setting the Output Voltage (Buck Converter)
The output voltage is set by an external resistor divider. R6 should be chosen in the range of 0.5k
to 4.7k. For
good noise covering and accuracy the lower feedback resistor R6 is selected to obtain at least a 250mA minimum
load current.
(18)
(19)
(20)
Negative Buck-Boost Converter VOFFE, Temperature Compensation
The non-synchronous constant off-time current mode buck-boost converter generates the negative VOFFE voltage
rail. This output rail is required to power the scan driver. The output voltage is temperature compensated and
fully adjustable from –22V to –5V. The external resistor divider on pins FB5 and SET allow programming high
and low voltage levels. The graph below shows the output voltage versus temperature in °C and series resistor
R19 (5k
to 7.5k). NTC (22k) and R18 (30k) define the slope of the curve, R19 allows selection of the
temperature point where temperature compensation begins and ends. The converter is compensated internally,
for further stabilization the feed-forward capacitor C22 can be chosen between 100pF and 3nF. Soft-start is also
realized with this capacitor. The larger the capacitor value the longer the soft-start time. The recommended C22
value is 2.2nF.
Copyright 2009–2010, Texas Instruments Incorporated
25
Product Folder Link(s): TPS65171
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