TPS54521 datasheet(22/41 Pages) TI1

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C11

R8 fc

× ×

ESR

C6 =

TPS54521

SLVS981C – JUNE 2010 – REVISED AUGUST 2013

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(16)

5. Type III compensation can be implemented with the addition of one capacitor, C11. This allows for slightly

higher loop bandwidths and higher phase margins. If used, C11 is calculated from Equation 17.

(17)

APPLICATION INFORMATION

Design Guide – Step-By-Step Design Procedure

This example details the design of a high frequency switching regulator using a Poscap output capacitor and

Type III frequency compensation. A few parameters must be known in order to start the design process.

These parameters are typically determined at the system level. For this example, we start with the following

known parameters:

Table 1.

Parameter

Value

Output Voltage

5 V

Output Current

5 A

Transient Response to a 3A load step

ΔVout = 1 % (50 mV)

Input Voltage

12 V nominal, 8 V to 17 V

Output Voltage Ripple

1.5% (75 mV p-p)

Start Input Voltage (Rising Vin)

6.806 V

Stop Input Voltage (Falling Vin)

4.824 V

Switching Frequency

700 kHz

Typical Application Schematic

The application schematic of Figure 34 was developed to meet the requirements above. The design procedure is

given in this section. For more information about Type II and Type III frequency compensation circuits, see

Designing Type III Compensation for Current Mode Step-Down Converters (SLVA352) and

Design Calculator (SLVC219).

Figure 34. Typical Application Circuit

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