TOP245F-TL 查看數據表（PDF） - Power Integrations, Inc

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TOP245F-TL

TOPSwitch-GX Family Extended Power, Design Flexible, EcoSmart, Integrated Off-line Switcher

Power Integrations, Inc 

TOP242-250

BENCH TEST PRECAUTIONS FOR EVALUATION OF ELECTRICAL CHARACTERISTICS

The following precautions should be followed when testing

TOPSwitch-GX by itself outside of a power supply. The

schematic shown in Figure 53 is suggested for laboratory testing

of TOPSwitch-GX.

When the DRAIN pin supply is turned on, the part will be

in the auto-restart mode. The CONTROL pin voltage will be

oscillating at a low frequency between 4.8 V and 5.8 V and

the drain is turned on every eigth cycle of the CONTROL pin

oscillation. If the CONTROL pin power supply is turned on

while in this auto-restart mode, there is only a 12.5% chance

that the CONTROL pin oscillation will be in the correct state

(drain active state) so that the continuous drain voltage waveform

may be observed. It is recommended that the VC power supply

be turned on first and the DRAIN pin power supply second if

continuous drain voltage waveforms are to be observed. The

12.5% chance of being in the correct state is due to the divide-

by-8 counter. Temporarily shorting the CONTROL pin to the

SOURCE pin will reset TOPSwitch-GX, which then will come

up in the correct state.

Typical Performance Characteristics

1.1

PI-2653-031904

Scaling Factors:

1.0

TOP242 P/G/Y/R/F: .45 200

TOP243 P/G:

.75

0.9

TOP243 Y/R/F: .90 180

TOP244 P/G:

1

0.8

TOP244 Y/R/F: 1.35 160

TOP245 Y/R/F: 1.80

0.7

TOP246 Y/R/F: 2.70 140

TOP247 Y/R/F: 3.60

0.6

TOP248 Y/R/F 4.50 120

TOP249 Y/R/F: 5.40

0.5

TOP250 Y/R/F: 6.32 100

0.4

80

0.3

60

0.2

40

-250

-200

-150

-100

-50

0

IX or IM (µA)

Figure 54a. Current Limit vs. X or M Pin Current (see Figures 55a and 56a for TOP245P and TOP246P).

1.1

1.0

0.9

0.8

0.7

Minimum

0.6

Maximum

0.5

Typical

PI-2652-042303

Scaling Factors:

TOP242 P/G/Y/R/F: .45 200

TOP243 P/G:

.75

TOP243 Y/R/F: .90 180

TOP244 P/G:

1

TOP244 Y/R/F: 1.35 160

TOP245 Y/R/F: 1.80

TOP246 Y/R/F: 2.70

140

TOP247 Y/R/F: 3.60

TOP248 Y/R/F 4.50

120

TOP249 Y/R/F: 5.40

TOP250 Y/R/F: 6.32

100

0.4

80

Maximum and minimum levels

0.3 are based on characterization.

60

0.2

0

40

5K

10K

15K

20K

25K

30K

35K

40K

45K

External Current Limit Resistor RIL (Ω)

Figure 54b. Current Limit vs. External Current Limit Resistance (see Figures 55b and 56b for TOP245P and

TOP246P).

40 M

12/04

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