LM2733XMF datasheet(3/13 Pages) NSC

tên linh kiện	LM2733XMF

Giải thích chi tiết về linh kiện	0.6/1.6 MHz Boost Converters With 40V Internal FET

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Block Diagram

20055403

Theory of Operation

The LM2733 is a switching converter IC that operates at a

fixed frequency (0.6 or 1.6 MHz) using current-mode control

for fast transient response over a wide input voltage range

and incorporate pulse-by-pulse current limiting protection.

Because this is current mode control, a 50 m

Ω sense resis-

tor in series with the switch FET is used to provide a voltage

(which is proportional to the FET current) to both the input of

the pulse width modulation (PWM) comparator and the cur-

rent limit amplifier.

At the beginning of each cycle, the S-R latch turns on the

FET. As the current through the FET increases, a voltage

(proportional to this current) is summed with the ramp com-

ing from the ramp generator and then fed into the input of the

PWM comparator. When this voltage exceeds the voltage on

the other input (coming from the Gm amplifier), the latch

resets and turns the FET off. Since the signal coming from

the Gm amplifier is derived from the feedback (which

samples the voltage at the output), the action of the PWM

comparator constantly sets the correct peak current through

the FET to keep the output volatge in regulation.

Q1 and Q2 along with R3 - R6 form a bandgap voltage

reference used by the IC to hold the output in regulation. The

currents flowing through Q1 and Q2 will be equal, and the

feedback loop will adjust the regulated output to maintain

this. Because of this, the regulated output is always main-

tained at a voltage level equal to the voltage at the FB node

"multiplied up" by the ratio of the output resistive divider.

The current limit comparator feeds directly into the flip-flop,

that drives the switch FET. If the FET current reaches the

limit threshold, the FET is turned off and the cycle terminated

until the next clock pulse. The current limit input terminates

the pulse regardless of the status of the output of the PWM

comparator.

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Số phần tương tự - LM2733XMF

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM2733XMF	406Kb / 16P	0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
Texas Instruments	LM2733XMF	1Mb / 22P	[Old version datasheet] LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
	LM2733XMF	1Mb / 26P	[Old version datasheet] 0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23
	LM2733XMF-NOPB	1Mb / 22P	[Old version datasheet] LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
	LM2733XMF/NOPB	1Mb / 26P	[Old version datasheet] 0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23

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Mô tả tương tự - LM2733XMF

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
National Semiconductor ...	LM2733	406Kb / 16P	0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
Texas Instruments	LM2733YMF-NOPB	1Mb / 22P	[Old version datasheet] LM2733 0.6/1.6 MHz Boost Converters With 40V Internal FET Switch in SOT-23
National Semiconductor ...	LM2731	528Kb / 16P	0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
National Semiconductor ...	LM2731	432Kb / 16P	0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
Texas Instruments	LM2731	1Mb / 22P	[Old version datasheet] 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
	LM2731XMF_NOPB	667Kb / 16P	[Old version datasheet] LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
	LM2731	1Mb / 29P	[Old version datasheet] 0.6/1.6-MHz Boost Converters With 22-V Internal FET Switch in SOT-23
	LM2731YMFX	629Kb / 16P	[Old version datasheet] LM2731 0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23
	LM2733	1Mb / 26P	[Old version datasheet] 0.6 and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23
Analog Microelectronics	AME5140	219Kb / 22P	1.6 MHz Boost Converter With 30V Internal FET Switch

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