TOP246RN Просмотр технического описания (PDF) - Power Integrations, Inc

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TOP246RN

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

Power Integrations, Inc 

TOP242-250

X Pin

M Pin

L Pin

IREM(N)

IUV

IOV

(Enabled)

Output

MOSFET

Switching

(Disabled)

Disabled when supply

I

output goes out of

regulation

ILIMIT (Default)

Current

Limit

I

Maximum

Duty Cycle

DCMAX (78.5%)

-22 µA

-27 µA

VBG

Pin Voltage

-250 -200 -150 -100 -50

0

I

VBG + VTP

50 100 150 200 250 300 350 400 I

X and L Pins (Y, R or F Package) and M Pin (P or G Package) Current (µA)

Note: This figure provides idealized functional characteristics with typical performance values. Please refer to the parametric

table and typical performance characteristics sections of the data sheet for measured data.

PI-2636-010802

Figure 11. MULTI-FUNCTION (P or G package), LINSE-SENSE, and EXTERNAL CURRENT LIMIT (Y, R or F package) Pin Characteristics.

be used as a remote ON/OFF and a synchronization input in

both modes. Please refer to Table 3 for possible combinations

of the functions with example circuits shown in Figure 30

through Figure 40. A description of specific functions in terms

of the MULTI-FUNCTION pin I/V characteristic is shown in

Figure 11. The horizontal axis represents MULTI-FUNCTION

pin current with positive polarity indicating currents flowing into

the pin. The meaning of the vertical axes varies with functions.

For those that control the ON/OFF states of the output such

as UV, OV and remote ON/OFF, the vertical axis represents

the enable/disable states of the output. UV triggers at IUV

(+50 µA typical) and OV triggers at IOV (+225 µA typical with

30 µA hysteresis). Between the UV and OV thresholds, the

output is enabled. For external current limit and line feed-

forward with DCMAX reduction, the vertical axis represents the

magnitude of the ILIMIT and DCMAX. Line feed-forward with

DCMAX reduction lowers maximum duty cycle from 78% at IM(DC)

(+60 µA typical) to 38% at IOV (+225 µA). External current

limit is available only with negative MULTI-FUNCTION

pin current. Please see graphs in the Typical Performance

Characteristics section for the current limit programming

range and the selection of appropriate resistor value.

12 M

12/04

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