TOP242 Ver la hoja de datos (PDF) - Power Integrations, Inc

Número de pieza

componentes Descripción

Fabricante

TOP242

Extended power, design elexible, integrated off-line switcher

Power Integrations, Inc 

TOP242-250

MULTI-FUNCTION PIN TABLE*

Figure Number

30 31 32 33 34 35 36 37 38 39 40

Three Terminal Operation

✔

Under-Voltage

✔✔

✔

Overvoltage

✔

✔

✔

Line Feed Forward (DC )

MAX

✔

✔

Overload Power Limiting

✔

External Current Limit

Remote ON/OFF

✔✔

✔✔

✔✔ ✔ ✔ ✔

*This table is only a partial list of many MULTI-FUNCTION pin configurations that are possible.

General Information & Table of Contents

Table 3. Typical MULTI-FUNCTION Pin Configurations.

Product Selector Guide 1 Figure 11 for a description of the functions where the horizon- TOPSwitch-GX to operate in a simple three terminal mode like

tal axis (left hand side) represents the EXTERNAL CURRENT TOPSwitch-II. The MULTI-FUNCTION pin is typically used

LIMIT pin current. The meaning of the vertical axes varies

with function. For those that control the on/off states of the

output such as remote ON/OFF, the vertical axis represents the

Data Sheets 2 for line sensing by connecting a resistor from this pin to the

rectified DC high voltage bus to implement OV, UV and DCMAX

reduction with line voltage. In this mode, the value of the

enable/disable states of the output. For external current limit,

the vertical axis represents the magnitude of the ILIMIT. Please

see graphs in the typical performance characteristics section

Application Notes 3 resistor determines the line OV/UV thresholds, and the DCMAX

is reduced linearly with rectified DC high voltage starting from

just above the UV threshold. In high efficiency applications

for the current limit programming range and the selection of

appropriate resistor value.

Design Ideas 4 this pin can be used in the external current limit mode instead,

to reduce the current limit externally to a value close to the

operating peak current, by connecting the pin to the SOURCE

MULTI-FUNCTION (M) Pin Operation (P and G Packages)

The LINE-SENSE and EXTERNAL CURRENT LIMIT pin

Design Tools 5 pin through a resistor. The same pin can also be used as a

remote on/off and a synchronization input in both modes. Please

functions are combined to a single MULTI-FUNCTION pin refer to Table 3 for possible combinations of the functions with

for P and G packages. The comparator with a 1 V threshold at

the LINE-SENSE pin is removed in this case as shown in

Quality and Reliability 6 example circuits shown in Figure 30 through Figure 40. A

description of specific functions in terms of the MULTI-

Figure 2b. All of the other functions are kept intact. However, FUNCTION pin I/V characteristic is shown in Figure 11. The

since some of the functions require opposite polarity of input

current (MULTI-FUNCTION pin), they are mutually

Package Information 7 horizontal axis represents MULTI-FUNCTION pin current with

positive polarity indicating currents flowing into the pin. The

exclusive. For example, line sensing features cannot be used meaning of the vertical axes varies with functions. For those

simultaneously with external current limit setting. When

current is fed into the MULTI-FUNCTION pin, it works as a

DPA-Switch DC-DC Seminar 8 that control the on/off states of the output such as UV, OV and

remote ON/OFF, the vertical axis represents the enable/

voltage source of approximately 2.6 V up to a maximum disable states of the output. UV triggers at IUV (+50 µA

LinkSwitch & TinySwitch-II AC-DC Seminar 9 current of +400 µA (typical). At +400 µA, this pin turns into a

constant current sink. When current is drawn out of the MULTI-

typical)

and

OV

triggers

at

I

OV

(+225

µA

typical

with

30

µA

hysteresis). Between the UV and OV thresholds, the output is

FUNCTION pin, it works as a voltage source of enabled. For external current limit and line feed forward with

TOPSwitch-GX AC-DC Seminar 10 approximately 1.3 V up to a maximum current of –240 µA

(typical). At –240 µA, it turns into a constant current source.

DC reduction, the vertical axis represents the magnitude of

MAX

the ILIMIT and DCMAX. Line feed forward with DCMAX reduction

Refer to Figure 12b.

lowers

maximum

duty

cycle

from

78%

at

I

M(DC)

(+60

µA

Sales Representatives and Distributors 11 There are a total of five functions available through the use of

typical) to 38% at IOV (+225 µA). External current limit is

available only with negative MULTI-FUNCTION pin current.

the MULTI-FUNCTION pin: OV, UV, line feed forward with Please see graphs in the typical performance characteristics

DCMAX reduction, external current limit and remote ON/OFF.

A short circuit between the MULTI-FUNCTION pin and

section for the current limit programming range and the

selection of appropriate resistor value.

SOURCE pin disables all five functions and forces

12 H

9/02

Share Link: