EV2354DS-00A【PDF 8/10 页】2A, 23V, 380KHz Step-Down Converter

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MP2354 – 2A, 23V, 380KHz STEP-DOWN CONVERTER

MP2354 Rev. 1.4

1/6/2006

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

MP2354 can be optimized for a wide range of

capacitance and ESR values.

Output Rectifier Diode

The output rectifier diode supplies the current to

the inductor when the upper transistor M1 is off.

Use a Schottky diode to reduce losses due to

the diode forward voltage and recovery times.

Choose a diode whose maximum reverse

voltage rating is greater than the maximum

input voltage, and whose current rating is

greater than the maximum load current.

Table 2 provides the Schottky diode part

numbers based on the maximum input voltage

and current rating.

Table 2—Schottky Rectifier Selection Guide

2A Load Current

Part Number

30BQ015

B220

SK23

SR22

20BQ030

B230

SK23

SR23

SS23

(Max)

15V

Vendor

(5)

3, 6

2, 3

20V

26V

Note:

5) Refer to Table 3 for Rectifier Manufacturers

Table 3—Schottky Diode Manufacturers

# Vendor

1 Diodes, Inc.

2 Fairchild Semiconductor

3 General Semiconductor

4 International Rectifier

5 On Semiconductor

6 Pan Jit International

Web Site

www.diodes.com

www.fairchildsemi.com

www.gensemi.com

www.irf.com

www.onsemi.com

www.panjit.com.tw

Compensation

MP2354 employs current mode control for easy

compensation and fast transient response. The

system stability and transient response are

controlled through the COMP pin. COMP pin is

the output of the internal transconductance

error amplifier. A series capacitor-resistor

combination sets a pole-zero combination to

control the characteristics of the control system.

The DC gain of the voltage feedback loop is

given by:

OUT

VEA

LOAD

VDC

Where A

VEA

is the error amplifier voltage gain,

400V/V;

transconductance, 1.95A/V; R

LOAD

is the load

resistor value.

the

current

sense

The system has two poles of importance. One

is due to the compensation capacitor (C3) and

the output resistor of error amplifier, and the

other is due to the output capacitor and the load

resistor. These poles are located at:

VEA

the

LOAD

error

Where

transconductance, 770μA/V.

amplifier

The system has one zero of importance, due to

the compensation capacitor (C3) and the

compensation resistor (R3). This zero is located

at:

Smaller f

provides more phase margin, but

longer transient settling time. A trade-off has to

be made between the stability and the transient

response. A typical value is less than one-fourth

of the crossover frequency.

The system may have another zero of

importance, if the output capacitor has a large

capacitance and/or a high ESR value. The zero,

due to the ESR and capacitance of the output

capacitor, is located at:

ESR

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