CS51031GD8 datasheet(4/12 Pages) ONSEMI

tên linh kiện	CS51031GD8

Giải thích chi tiết về linh kiện	Fast PFET Buck Controller

PDF	12 Pages

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nhà sản xuất	ONSEMI [ON Semiconductor]

Trang chủ	http://www.onsemi.com

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CS51031

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VGATE

PGND

VGATE

Flip–Flop

–

VFB

Comparator

VFB

1.25 V

0.7 V

Hold Off

Comp

Fault

Comp

1.15 V

CS Charge

Sense

Comparator

Slow Discharge

Flip–Flop

GND

–

Slow Discharge

Comparator

2.3 V

2.4 V

–

Comparator

2.5 V

1.5 V

VREF = 3.3 V

COSC

2.5 V

1.5 V

VREF

3.3 V

VCCOK

VCC

Oscillator

Comparator

VCC

VREF

7IC

Figure 2. Block Diagram

CIRCUIT DESCRIPTION

THEORY OF OPERATION

Control Scheme

The CS51031 monitors the output voltage to determine

when to turn on the PFET. If VFB falls below the internal

reference voltage of 1.25 V during the oscillator’s charge

cycle, the PFET is turned on and remains on for the duration

of the charge time. The PFET gets turned off and remains off

during the oscillator’s discharge time with the maximum

duty cycle to 80%. It requires 7.0 mV typical, and 20 mV

maximum ripple on the VFB pin is required to operate. This

method of control does not require any loop stability

compensation.

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