Datasheet > MP38875

MP38875

更新时间： 2024-04-09 19:01:19

品牌	Logo	应用领域
芯源 - MPS		栅驱动驱动器
页数	文件大小	规格书
14页	589K
描述
15A, 16V, 800kHz 降压变换器，具有同步栅级驱动器

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数据手册

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MP38875 数据手册

MP38875 – 15A, 16V, 800kHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER

FUNCTION BLOCK DIAGRAM

SYNCIN

SYNCOUT

CURRENT SENSE

AMPLIFIER

- -

REGULATOR

BST

REGULATOR

OSCILLATOR

800KHz

DRIVER

CURRENT

LIMIT

I_SS

COMPARATOR

VCC

SS/TRK

REFERENCE

DRIVER

PWM

GND

ERROR

AMPLIFIER

COMPARATOR

Power

Good

COMP

Figure 2—Functional Block Diagram

OPERATION

The MP38875 is a fixed frequency, synchronous,

step-down switching regulator with an integrated

high-side power MOSFET and a gate driver for a

low-side external MOSFET. It achieves 15A

continuous output current over a wide input

supply range with excellent load and line

regulation. It provides a single highly efficient

solution with current mode control for fast loop

response and easy compensation.

not reach the COMP set current value, the power

MOSFET will be forced to turn off.

Error Amplifier

The error amplifier compares the FB pin voltage

with the internal 0.8V reference (REF) and

outputs a current proportional to the difference

between the two. This output current is then used

charge

discharge

the

external

compensation network to form the COMP

voltage, which is used to control the power

MOSFET current. The optimized external

compensation network minimizes the external

component counts and simplifies the control loop

design. See Application Information for

compensation network design.

The MP38875 operates in a fixed frequency,

peak current control mode to regulate the output

voltage. A PWM cycle is initiated by the internal

clock. The integrated high-side power MOSFET

is turned on and remains on until its current

reaches the value set by the COMP voltage.

When the power switch is off, it remains off until

the next clock cycle starts. If, in 90% of one PWM

period, the current in the power MOSFET does

MP38875 Rev. 0.9

11/20/2009

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

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