6TPE100MPB2 datasheet(9/22 Pages) NSC

9 / 22 page

Block Diagram

30111836

General Description

The LMZ10503 SIMPLE SWITCHER® power module is a

complete, easy-to-use DC-DC solution capable of driving up

to a 3A load with exceptional power conversion efficiency,

output voltage accuracy, line and load regulation. The

LMZ10503 is available in an innovative package that en-

hances thermal performance and allows for hand or machine

soldering.

The LMZ10503 can accept an input voltage rail between

2.95V and 5.5V and deliver an adjustable and highly accurate

output voltage as low as 0.8V. One megahertz fixed frequen-

cy PWM switching provides a predictable EMI characteristic.

Two external compensation components can be adjusted to

set the fastest response time, while allowing the option to use

ceramic and/or electrolytic output capacitors. Externally pro-

grammable soft-start capacitor facilitates controlled startup.

The LMZ10503 is a reliable and robust solution with the fol-

lowing features: lossless cycle-by-cycle peak current limit to

protect for over current or short-circuit fault, thermal shut-

down, input under-voltage lock-out, and pre-biased startup.

Design Guideline And Operating

Description

Design Steps

LMZ10503 is fully supported by Webench® and offers the

following: component selection, performance, electrical, and

thermal simulations as well as the Build-It board, for a reduced

design time. On the other hand, all external components can

be calculated by following the design procedure below.

1. Determine the input voltage and output voltage. Also, make

note of the ripple voltage and voltage transient requirements.

2. Determine the necessary input and output capacitance.

3. Calculate the feedback resistor divider.

4. Select the optimized compensation component values.

5. Estimate the power dissipation and board thermal require-

ments.

6. Follow the PCB design guideline.

7. Learn about the LMZ10503 features such as enable, input

UVLO, soft-start, tracking, pre-biased startup, current limit,

and thermal shutdown.

Design Example

For this example the following application parameters exist.

•

IN = 5V

•

OUT = 2.5V

•

OUT = 3A

•

ΔV

OUT = 20 mVpk-pk

•

ΔV

o_tran = ±20 mVpk-pk

Input Capacitor Selection

A 22 µF or 47 µF high quality dielectric (X5R, X7R) ceramic

capacitor rated at twice the maximum input voltage is typically

sufficient. The input capacitor must be placed as close as

possible to the VIN pin and GND exposed pad to substantially

eliminate the parasitic effects of any stray inductance or re-

sistance on the PC board and supply lines.

Neglecting capacitor equivalent series resistance (ESR), the

resultant input capacitor AC ripple voltage is a triangular

waveform. The minimum input capacitance for a given peak-

to-peak value (

ΔV

IN) of VIN is specified as follows:

where the PWM duty cycle, D, is given by:

ΔV

IN is 1% of VIN, this equals to 50 mV and fSW = 1 MHz

6TPE100MPB2 Datasheet(PDF) 9 Page - National Semiconductor (TI)

6TPE100MPB2 Datasheet(HTML) 9 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22

Datasheet Download

Link URL