6TPE100MPB2 datasheet(11/22 Pages) NSC

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TABLE 1. Recommended Output Filter Capacitors

O (µF)

Voltage (V), R

ESR (mΩ)

Make

Manufacturer

Part Number

Case Size

6.3, < 5

Ceramic, X5R

TDK

C3216X5R0J226M

1206

6.3, < 5

Ceramic, X5R

TDK

C3216X5R0J476M

1206

6.3, < 5

Ceramic, X5R

TDK

C3225X5R0J476M

1210

10.0, < 5

Ceramic, X5R

TDK

C3225X5R1A476M

1210

100

6.3, < 5

Ceramic, X5R

TDK

C3225X5R0J107M

1210

100

6.3, 50

Tantalum

AVX

TPSD157M006#0050

D, 7.5 x 4.3 x 2.9 mm

100

6.3, 25

Organic Polymer

Sanyo

6TPE100MPB2

B2, 3.5 x 2.8 x 1.9 mm

150

6.3, 18

Organic Polymer

Sanyo

6TPE150MIC2

C2, 6.0 x 3.2 x 1.8 mm

330

6.3, 18

Organic Polymer

Sanyo

6TPE330MIL

D3L, 7.3 x 4.3 x 2.8 mm

470

6.3, 23

Niobium Oxide

AVX

NOME37M006#0023

E, 7.3 x 4.3 x 4.1 mm

Output Voltage Setting

A resistor divider network from V

OUT to the FB pin determines

the desired output voltage as follows:

fbt is defined based on the voltage loop requirements and

fbb is then selected for the desired output voltage. Resistors

are normally selected as 0.5% or 1% tolerance. Higher accu-

racy resistors such as 0.1% are also available.

The feedback voltage (at V

OUT = 2.5V) is accurate to within

-2.5% / +2.5% over temperature and over line and load reg-

ulation. Additionally, the LMZ10503 contains error nulling

circuitry to substantially eliminate the feedback voltage vari-

ation over temperature as well as the long term aging effects

of the internal amplifiers. In addition the zero nulling circuit

dramatically reduces the 1/f noise of the bandgap amplifier

and reference. The manifestation of this circuit action is that

the duty cycle will have two slightly different but distinct op-

erating points, each evident every other switching cycle.

Loop Compensation

The LMZ10503 preserves flexibility by integrating the control

components around the internal error amplifier while utilizing

three small external compensation components from V

OUT to

FB. An integrated type II (two pole, one zero) voltage-mode

compensation network is featured. To ensure stability, an ex-

ternal resistor and small value capacitor can be added across

the upper feedback resistor as a pole-zero pair to complete a

type III (three pole, two zero) compensation network. The

compensation components recommended in Table 2 provide

type III compensation at an optimal control loop performance.

The typical phase margin is 45° with a bandwidth of 80 kHz.

Calculated output capacitance values not listed in Table 2

should be verified before designing into production. A detailed

application note is available to provide verification support,

AN-2013. In general, calculated output capacitance values

below the suggested value will have reduced phase margin

and higher control loop bandwidth. Output capacitance val-

ues above the suggested values will experience a lower

bandwidth and increased phase margin. Higher bandwidth is

associated with faster system response to sudden changes

such as load transients. Phase margin changes the charac-

teristics of the response. Lower phase margin is associated

with underdamped ringing and higher phase margin is asso-

ciated with overdamped response. Losing all phase margin

will cause the system to be unstable; an optimized area of

operation is 30° to 60° of phase margin, with a bandwidth of

100 kHz ±20 kHz.

30111848

TABLE 2. LMZ10503 Compensation Component Values

(V)

O (µF)

ESR (m

Ω)

fbt

Ω)

comp

(pF)

comp

Ω)

Min

Max

5.0

143

8.06

100

8.25

100

71.5

180

4.32

150

56.2

270

2.1

150

270

10.8

150

66.5

270

23.7

220

53.6

360

220

360

30.1

3.3

100

56.2

5.62

66.5

150

5.49

100

45.3

270

2.8

150

40.2

360

1.5

150

40.2

360

7.32

150

43.2

360

15.4

220

40.2

470

10.5

220

40.2

470

20.5

Note: In the special case where the output voltage is 0.8V, it is recom-

mended to remove R

fbb and keep Rfbt, Rcomp, and Ccomp for a type III

compensation.

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