Datasheet > MP2492

MP2492

更新时间： 2024-04-09 19:01:55

品牌	Logo	应用领域
芯源 - MPS		/
页数	文件大小	规格书
11页	582K
描述
2A, 55V, 100KHz 降压变换器，具有可调输出限流功能

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MP2492 数据手册

MP2492–2A,55V, 100kHzWITH PROGRAMMABLE OUTPUT CURRENT LIMIT

OPERATION

The MP2492 is a current mode buck regulator.

That is, the EA output voltage is proportional to

the peak inductor current.

If the Current Sense Amplifier plus Slope

Compensation signal does not exceed the

COMP voltage, then the falling edge of the CLK

resets the Flip-Flop.

At the beginning of a cycle SW is off, the EA

output voltage is higher than the current sense

amplifier output and the current comparator’s

output is low. The rising edge of the 100kHz

CLK signal sets the RS Flip-Flop. Its output

turns on SW thus connecting the SW pin and

inductor to the input supply.

The output of the Error Amplifier integrates the

voltage difference between the feedback and

the 0.8V bandgap reference. The polarity is

such that a FB pin voltage lower than 0.8V

increases the EA output voltage. Since the EA

output voltage is proportional to the peak

inductor current, an increase in its voltage

increases current delivered to the output. An

external Schottky Diode (D1) carries the

inductor current when SW is off.

The increasing inductor current is sensed and

amplified by the Current Sense Amplifier. Ramp

compensation is summed to Current Sense

Amplifier output and compared to the Error

Amplifier output by the Current Comparator.

When the Current Sense Amplifier plus Slope

Compensation signal exceeds the EA output

voltage, the RS Flip-Flop is reset and the

MP2492 reverts to its initial SW off state.

The output current information is sensed via the

ISP and ISN pins. The sense voltage is set at

100mV. If V_SENSE, the difference of V_ISPand

V_ISN, is less than 100mV, the output voltage of

the power supply will be set by the FB pin. If

V_SENSEreaches 100mV, the current limit loop

will pull down on SS and regulate the output at

a constant current.

VIN

CURRENT SENSE

AMPLIFIER

POR

4.0V

REGULATOR

X13.5

RSEN

20mΩ

RAMP

GENERATOR

REGULATOR

BST

REGULATOR

OSCILLATOR

DRIVER

100KHz

ENABLE

ISP

6pF

CURRENT

LIMIT

COMPARATOR

REFERENCE

72.8pF

2483kΩ

PWM

COMPARATOR

100mV

ISN

GND

Figure 1—Function Block Diagram

MP2492 Rev. 1.0

12/20/2010

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

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