B340L datasheet(7/11 Pages) ORISTER

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Page No. : 7/11

DS‐RS6515‐08 JULY, 2010

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Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high

voltage rating and low ESR make them ideal for switching regulator applications. However, care must be taken when these

capacitors are used at input and output. When a ceramic capacitor is used at the input and the power is supplied by a wall

adapter through long wires, a load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to

the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially

cause a voltage spike at VIN large enough to damage the part.

Output Rectifier Diode

The output rectifier diode supplies the current to the inductor when the high‐side switch is off. To reduce losses due to the

diode forward voltage and recovery times, use a Schottky diode.

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.

Choose a rectifier who’s maximum reverse voltage rating is greater than the maximum input voltage, and who’s current

rating is greater than the maximum load current.

Checking Transient Response

The regulator loop response can be checked by looking at the load transient response. Switching regulators take several

cycles to respond to a step in load current. When a load step occurs, VOUT immediately shifts by an amount equal to ΔILOAD (ESR)

also begins to charge or discharge COUT generating a feedback error signal for the regulator to return VOUT to its steady‐state

value. During this recovery time, VOUT can be monitored for overshoot or ringing that would indicate a stability problem.

Table 1. Suggested Inductors for Typical Application Circuit

Component Supplier

Series

Dimensions (mm)

MAGLAYERS

MSCDRI‐124‐150M

12 x 12 x 5.0

SUMIDA

CDRH104R

10.1 x 10 x 3.0

TOKO

D104C

10 x 10 x 4.3

Table 2. Suggested Capacitors for CIN and COUT

Component Supplier

Part No.

Capacitance (uF)

Case Size

MURATA

GRM31CR61E106K

1206

TDK

C3225X5R1E106K

1206

MURATA

GRM32ER71C226M

1210

TDK

C3225X5R1C226M

1210

Table 3. Schottky Rectifier Selection Guide

2A Load Current

VIN (Max.)

Part No.

Vendor

B320

Diodes, Inc. (www.diodes.com)

SK33

Pan Jit International (www.panjit.com.tw)

20V

SS32

General Semiconductor (www.gensemi.com)

B330

Diodes, Inc. (www.diodes.com)

B340L

Diodes, Inc. (www.diodes.com)

SK33

Diodes, Inc. (www.diodes.com)

MBRD330

On Semiconductor (www.onsemi.com)

26V

SS33

Fairchild Semiconductor (www.fairchildsemi.com)

General Semiconductor (www.gensemi.com)

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