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參數(shù)資料
| 型號： | MC34166T |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 6 A SWITCHING REGULATOR, 81 kHz SWITCHING FREQ-MAX, PSFM5 |
| 封裝： | TO-220, 5 PIN |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 239K |
| 代理商： | MC34166T |
MC34166, MC33166
http://onsemi.com
8
Switch Output
The output transistor is designed to switch a maximum
of 40 V, with a minimum peak collector current of 3.3 A.
When configured for step–down or voltage–inverting
applications, as in Figures 19 and 23, the inductor will
forward bias the output rectifier when the switch turns off.
Rectifiers with a high forward voltage drop or long turn–on
delay time should not be used. If the emitter is allowed to
go sufficiently negative, collector current will flow,
causing additional device heating and reduced conversion
efficiency. Figure 9 shows that by clamping the emitter to
0.5 V, the collector current will be in the range of 100
μ
A
over temperature. A 1N5822 or equivalent Schottky barrier
rectifier is recommended to fulfill these requirements.
Undervoltage Lockout
An Undervoltage Lockout comparator has been
incorporated to guarantee that the integrated circuit is fully
functional before the output stage is enabled. The internal
5.05 V reference is monitored by the comparator which
enables the output stage when V
CC
exceeds 5.9 V. To
prevent erratic output switching as the threshold is crossed,
0.9 V of hysteresis is provided.
Thermal Protection
Internal Thermal Shutdown circuitry is provided to protect
the integrated circuit in the event that the maximum junction
temperature is exceeded. When activated, typically at 170
°
C,
the latch is forced into a ‘reset’ state, disabling the output
switch. This feature is provided to prevent catastrophic
failures from accidental device overheating.
It is not
intended to be used as a substitute for proper heatsinking.
The MC34166 is contained in a 5–lead TO–220 type package.
The tab of the package is common with the center pin (Pin 3)
and is normally connected to ground.
DESIGN CONSIDERATIONS
Do not attempt to construct a converter on wire–wrap
or plug–in prototype boards.
Special care should be taken
to separate ground paths from signal currents and ground
paths from load currents. All high current loops should be
kept as short as possible using heavy copper runs to
minimize ringing and radiated EMI. For best operation, a
tight component layout is recommended. Capacitors C
IN
,
C
O
, and all feedback components should be placed as close
to the IC as physically possible. It is also imperative that the
Schottky diode connected to the Switch Output be located as
close to the IC as possible.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MC34166TG | 功能描述:直流/直流開關調節(jié)器 40V 3A Buck/Boost/Inverting RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34166TG | 制造商:ON Semiconductor 功能描述:DC/DC Converter IC |
| MC34166TH | 功能描述:直流/直流開關調節(jié)器 40V 3A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34166THG | 功能描述:直流/直流開關調節(jié)器 40V 3A Buck/Boost/Inverting RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| MC34166TV | 功能描述:直流/直流開關調節(jié)器 40V 3A RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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