MP2365 データシートの表示（PDF） - Monolithic Power Systems

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MP2365

3A, 28V, 1.4MHz Step-Down Converter

Monolithic Power Systems 

MP2365 – 3A, 28V, 1.4MHz STEP-DOWN CONVERTER

To optimize the compensation components for

conditions not listed in Table 3, the following

procedure can be used.

1. Choose the compensation resistor (R3) to set

the desired crossover frequency. Determine the

R3 value by the following equation:

R3 = 2π × C2 × fC × VOUT

GEA × GCS VFB

Where fC is the desired crossover frequency.

2. Choose the compensation capacitor (C3) to

achieve the desired phase margin. For

applications with typical inductor values, setting

the compensation zero, fZ1, below one forth of the

crossover frequency provides sufficient phase

margin. Determine the C3 value by the following

equation:

C3 >

4

2π × R3 × fC

3. Determine if the second compensation

capacitor (C6) is required. It is required if the ESR

zero of the output capacitor is located at less than

half of the 1.4MHz switching frequency, or the

following relationship is valid:

1

< fS

2π × C2 × RESR 2

If this is the case, then add the second

compensation capacitor (C6) to set the pole fP3

at the location of the ESR zero. Determine the

C6 value by the equation:

C6 = C2 × RESR

R3

External Bootstrap Diode

It is recommended that an external bootstrap

diode be added when the system has a 5V

fixed input or the power supply generates a 5V

output. This helps improve the efficiency of the

regulator. The bootstrap diode can be a low

cost one such as IN4148 or BAT54.

5V

BS

MP2365

SW

10nF

Figure 2—External Bootstrap Diode

This diode is also recommended for high duty

cycle operation (when VOUT >65%) and high

VIN

output voltage (VOUT>12V) applications.

MP2365 Rev. 0.91

www.MonolithicPower.com

9

7/10/2006

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