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| 型号： | TPS51727RHARG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PQCC40 |
| 封装： | 6 X 6 MM, GREEN, PLASTIC, QFN-40 |
| 文件页数： | 25/42页 |
| 文件大小： | 0K |
| 代理商： | TPS51727RHARG4 |
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www.ti.com ..................................................................................................................................................... SLUS806B – APRIL 2008 – REVISED JANUARY 2009
Step Ten
Calculate THAL components. The THRM pin puts out a nominal 60-
A current. The trip voltage is 0.75 V.
Therefore, the resistance at the trip point needs to be 0.75 V / 61
A = 12.3 kΩ. For a trip temperature of 85°C,
the recommended 150 k
Ω NTC thermistor is 10.3 kΩ. To move the trip point to the correct resistance, we add a
series resistance of 2.0 k
Ω. Depending on the thermistors selection and desired trip point, adding a parallel
resistance to obtain the correct resistance at the trip point is also possible. In order to keep the sensing as
accurate as possible in both cases, the contribution of the fixed resistance at the trip point should be as small as
possible. If THAL is not used, leave both THAL and THRM open.
Step Eleven
Select decoupling and peripheral components.
For TPS51727 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 OK.
V5IN decoupling ≥ 2.2F, ≥ 10V
V5FILT decoupling ≥ 1F≥10V
VREF decoupling 0.22F to 1F, ≥ 4V
Bootstrap capacitors ≥ 0.22F, ≥ 10V
Bootstrap diodes (optional) 30-V Schottky diode, BAT-54 or better
PMON filter, 10 kΩ, 5% resistor / 10 nF 20% capacitor
Pull-up resistors. Use a 10-kΩ, 5% resistor, or as system requirements dictate.
For power chain and other component selection, see Table 1.
Copyright 2008–2009, Texas Instruments Incorporated
31
Product Folder Link(s): TPS51727
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