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MC34167TG bảng dữ liệu(PDF) 8 Page - ON Semiconductor

tên linh kiện MC34167TG
Giải thích chi tiết về linh kiện  5.0 A, Step?뭊p/Down/Inverting Switching Regulators
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MC34167, MC33167
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8
Switch Output
The output transistor is designed to switch a maximum of
40 V, with a minimum peak collector current of 5.5 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
mA over temperature. A
1N5825
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
reference voltage is monitored by the comparator which
enables the output stage when VCC 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 MC34167 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 Cin,
CO, 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.


Số phần tương tự - MC34167TG

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MC34167TG ONSEMI-MC34167TG Datasheet
263Kb / 20P
   5.0 A, Step?뭊p/Down/ Inverting Switching Regulators
November, 2005 ??Rev. 7
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Mô tả tương tự - MC34167TG

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