MP100 – OFFLINE INDUCTOR-LESS REGULATOR

MP100 Rev. 1.04

www.MonolithicPower.com

11

1/23/2014

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Surge

Since there is no capacitor to absorb AC line

transients, MOV should be used to protect the IC

to survive the transient test.

With 750V switch integrated, MP100 can pass

1kV surge test with an appropriate MOV

connected between the line input ports.

PCB Layout Guide

PCB layout is very important to achieve good

regulation, ripple rejection, transient response

and

thermal

performance.

It

is

highly

recommended to duplicate EVB layout for

optimum performance.

If change is necessary, please follow these

guidelines and take Figure 4 for reference.

1) Minimize the loop area formed by positive

output of rectifier, VIN, VB and GND.

2) Ensure all feedback connections are short

and direct. Place the feedback resistors and

compensation components as close to the

chip as possible.

3) Output capacitor should be put close to the

output terminal.

4) Connect the exposed pad with GND to a

large copper area to improve thermal

performance and long-term reliability

GND

MP100

VD

5

NC

7

FB 3

VB

6

PG

1

VIN

8

GND

2

VOUT

4

U1

BD1

C1

C2

R1

R2

R3

C3

RF1

L

N

VOUT

GND

C4

Top Layer

R1

R2

R3

Bottom Layer

Figure 4: PCB Layout

Design Example

Below is a design example following the

application guidelines for the specifications:

Table 2: Design Example

85V to 305V

12V

10mA

The detailed application schematic is shown in

Figure 5. The typical performance and circuit

waveforms have been shown in the Typical

Performance Characteristics section. For more

device application, please refer to the related

Evaluation Board Datasheets.