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參數(shù)資料
| 型號： | TPS65170RHDT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 4.2 A SWITCHING REGULATOR, 900 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-28 |
| 文件頁數(shù)： | 11/35頁 |
| 文件大?。?/td> | 4698K |
| 代理商： | TPS65170RHDT |
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RECT(AVG)
LOGIC(EFFECTIVE)
I
= I
1
D
-
RECT
RECT(AVG)
F
P
= I
V
www.ti.com
SLVSA27 – OCTOBER 2009
Rectifier Diode Selection (Buck Converter)
To achieve good efficiency, the rectifier diode should be a Schottky type. Its reverse voltage rating should be
higher than the maximum VIN. The average rectified forward current through the diode can be calculated using
(15)
A Schottky diode with 2A average rectified current rating is adequate for most applications. Smaller diodes can
be used in applications with lower output current, however, the diode must be able to handle the power
dissipated in it, which can be calculated using Equation 16.
(16)
Table 5. Buck Converter Rectifier Diode Selection
PART NUMBER
VR / IAVG
VF
RθJA
SIZE
COMPONENT SUPPLIER
MBRS320
20V / 3A
0.44V at 3A
46°C/W
SMC
International Rectifier
SL22
20V / 2A
0.44V at 2A
75°C/W
SMB
Vishay Semiconductor
SS22
20V / 2A
0.50V at 2A
75°C/W
SMB
Fairchild Semiconductor
Output Capacitance Selection (Buck Converter)
To minimize output voltage ripple, the output capacitors should be good quality ceramic types with low ESR. The
buck converter is stable over a range of output capacitance values, but an output capacitance of 44F is a good
starting point for typical applications.
POSITIVE CHARGE PUMP CONTROLLER
The positive charge pump is driven directly from the boost converter's switch node and regulated by controlling
the current through an external PNP transistor. An internal block diagram of the positive charge pump is shown
During normal operation, the TPS65170 is able to provide up to 5mA of base current and is designed to work
best with transistors whose DC gain (hFE) is between 100 and 300. The charge pump is protected against
short-circuits on its output, which are detected when the voltage on the charge pump's feedback pin (VFBP) is
below 100mV. During short-circuit mode, the base current available from the CTRLP pin is limited to 55A
(typical). Note that if a short-circuit is detected during normal operation, boost converter switching is also halted
until VFBP > 100mV.
NOTE
The emitter of the external PNP transistor should always be connected to VS, the
output of the boost converter at the output side of the isolation switch. The TPS65170
uses the CTRLP pin to sense the voltage across the isolation switch and control boost
converter start-up. Connecting the emitter of the external PNP transistor to any other
voltage (e.g., VIN) will prevent proper start-up of the boost converter and positive
charge pump.
Copyright 2009, Texas Instruments Incorporated
19
Product Folder Link(s) :TPS65170
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| TPS65176RHDR | 功能描述:其他電源管理 LCD BIAS IC FOR TV RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel |
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