U2008B-XY Просмотр технического описания (PDF) - Atmel Corporation

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U2008B-XY

Low-cost Phase-control IC with Soft Start

Atmel Corporation 

2. Pin Configuration

Figure 2-1. Pinning

ISENSE 1

8 OUTPUT

Cϕ 2

CONTROL 3

U2008B

7 VSYNC

6 Rϕ

GND 4

5 -VS

U2008B

Table 2-1.

Pin

1

2

3

4

5

6

7

8

Pin Description

Symbol Function

ISENSE Load current sensing

Cϕ

Ramp voltage

CONTROL Control input/compensation output

GND

Ground

-VS

Supply voltage

Rϕ

Ramp current adjustment

VSYNC Voltage synchronization

OUTPUT Trigger output

2.1 Mains Supply, Pin 5

The integrated circuit U2008B, which also contains voltage limiting, can be connected via D1 and

R1 to the mains supply, see Figure 1-2 on page 2. Supply voltage, between Pin 4 (pos., ⊥) and

Pin 5, is smoothed by C1.

The series resistance R1 can be calculated as follows:

R1max = 0.85 × V-----M--2---–--×---V--I--tS-o--m-t---a--x-

where:

VM

VSmax

Itot

ISmax

Ix

= Mains voltage

= Maximum supply voltage

= ISmax + Ix = Total current compensation

= Maximum current consumption of the IC

= Current consumption of the external components

Operation with externally stabilized DC voltage is not recommended.

3

4712C–AUTO–07/07

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