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參數(shù)資料
| 型號： | TC105503ECT |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | PFM/PWM Step-Down DC/DC Controller |
| 中文描述： | 烤瓷/ PWM降壓DC / DC控制器 |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 433K |
| 代理商： | TC105503ECT |
2002 Microchip Technology Inc.
DS21349B-page 5
TC105
3.8
External Switching Transistor
Selection
EXT is a complementary output with a maximum ON
resistance of 22
to V
DD
when high and 19
to ground
when low. It is designed to directly drive a P-channel
MOSFET or a PNP bipolar transistor through a base
current limiting resistor (Figure 4-2). APNPtransistor is
recommended in applications where V
IN
is less than
2.5V. Otherwise, a P-channel MOSFET is preferred as
it affords the highest efficiency because it does not
draw any gate drive current. However, P-channel
MOSFETs are typically more expensive than bipolar
transistors.
P-channel MOSFET selection is determined mainly by
the on-resistance, gate-source threshold, and gate
charge requirements. Also, the drain-to-source and
gate-to-source breakdown voltage ratings must be
greater than V
DD
. The total gate charge specifica-
tion should be less than 100nC for best efficiency. The
MOSFET must be capable of handling the required
peak inductor current, and should have a very low
on-resistance at that current. For example, an Si9430
MOSFET has a drain-to-source rating of -20V, and a
typical on-resistance r
DS
of 0.07
at 2A, with V
GS
=
-4.5V. Table 4-1 lists suppliers of external components
recommended for use with the TC105.
3.8.1
BOARD LAYOUT GUIDELINES
As with all inductive switching regulators, the TC105
generates fast switching waveforms, which radiate
noise. Interconnecting lead lengths should be mini-
mized to keep stray capacitance, trace resistance and
radiated noise as low as possible. In addition, the GND
pin, input bypass capacitor and output filter capacitor
ground leads should be connected to a single point.
The input capacitor should be placed as close to power
and ground pins of the TC105 as possible. The length
of the EXT trace must also be kept as short as possible.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TC105503ECTTR | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 PFM/PWM Step-Down RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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| TC1055-1.8VCT713 | 功能描述:低壓差穩(wěn)壓器 - LDO .1mA w/Shtdn & Error 1.8V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TC1055-2.5VCT | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50mA, 100mA and 150mA CMOS LDOs with Shutdown and ERROR Output |
| TC1055-2.5VCT713 | 功能描述:低壓差穩(wěn)壓器 - LDO .1mA w/Shtdn & Error 2.5V RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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