PM6644

Application information

Doc ID 023203 Rev 1

23/35

K is a constant (< 0.1) that defines the ratio between the controller bandwidth and the

switching frequency.

The output capacitor must store the inductor energy generating an output ripple within the

output voltage ripple requirements.

Equation 14

A low ESR capacitor is required to reduce the output voltage ripple.

Equation 15

Finally the output capacitor choice heavily impacts the load transient response.

Table 12 shows a list of some capacitor part numbers.

3.1.4

Maximum RMS output current

Both high-side and low-side embedded power MOSFETs of the switching regulator can

withstand a maximum RMS current of 300 mA.

on the application specifications of:

●

●

●

inductor current ripple

inductor value L, according to Equation 7 ).

given by:

Equation 16

Table 12.

Output capacitor part number

Manufacturer

Part number

Capacitor value

(

µF)

Rated voltage (V)

ESR max. (M

Ω)

TAYIO YUDEN

JMK212BJ226MG-T

22

6.3

70

SANYO

POSCAP 6TPC33M

33

6.3

7 to 15

V

RIPPLEout

R

out

∆I

L

⋅

=

V

RIPPLEout

T

sw

∆I

L

⋅

8C

OUT

⋅

-------------------------

=

I

RMS HS

,

DI

LRMS

DI

LOAD

()

2

∆I

L

()

2

12

----------------

+

⋅

300mA

=

=

⋅

=