TOP250F datasheet(4/52 Pages) POWERINT

4 / 52 page

TOP242-250

11/05

Pin Functional Description

DRAIN (D) Pin:

High voltage power MOSFET drain output. The internal

start-up bias current is drawn from this pin through a switched

high-voltage current source. Internal current limit sense point

for drain current.

CONTROL (C) Pin:

Error ampliﬁer and feedback current input pin for duty cycle

control. Internal shunt regulator connection to provide internal

bias current during normal operation. It is also used as the

connection point for the supply bypass and auto-restart/

compensation capacitor.

LINE-SENSE (L) Pin: (Y, R or F package only)

Input pin for OV, UV, line feed forward with DC

MAX reduction,

remoteON/OFFandsynchronization. AconnectiontoSOURCE

pin disables all functions on this pin.

EXTERNALCURRENTLIMIT(X)Pin:(Y,RorFpackage

only)

Input pin for external current limit adjustment, remote

ON/OFF, and synchronization. A connection to SOURCE pin

disables all functions on this pin.

MULTI-FUNCTION (M) Pin: (P or G package only)

This pin combines the functions of the LINE-SENSE (L) and

EXTERNAL CURRENT LIMIT (X) pins of the Y package

into one pin. Input pin for OV, UV, line feed forward with

MAX reduction, external current limit adjustment, remote

ON/OFF and synchronization. A connection to SOURCE pin

disables all functions on this pin and makes TOPSwitch-GX

operate in simple three terminal mode (like TOPSwitch-II).

FREQUENCY (F) Pin: (Y, R or F package only)

Input pin for selecting switching frequency: 132 kHz if

connected to SOURCE pin and 66 kHz if connected to

CONTROL pin. The switching frequency is internally set for

ﬁxed 132 kHz operation in P and G packages.

SOURCE (S) Pin:

Output MOSFET source connection for high voltage power

return. Primary side control circuit common and reference point.

PI-2724-010802

Tab Internally

Connected to

SOURCE Pin

Y Package (TO-220-7C)

1 C

3 X

2 L

5 F

4 S

7 D

P Package (DIP-8B)

G Package (SMD-8B)

R Package (TO-263-7C)

F Package (TO-262-7C)

1 2 3 4 5

C L X S F D

Figure 3. Pin Conﬁguration (top view).

Input

Voltage

CONTROL

RIL

RLS

12 k

Ω

2 M

Ω

VUV = IUV x RLS

VOV = IOV x RLS

For RLS = 2 M

Ω

DCMAX@100 VDC = 78%

DCMAX@375 VDC = 38%

For RIL = 12 kΩ

ILIMIT = 69%

See Figure 54b for

other resistor values

(RIL) to select different

ILIMIT values

VUV = 100 VDC

VOV = 450 VDC

PI-2509-040501

Input

Voltage

VUV = IUV x RLS

VOV = IOV x RLS

For RLS = 2 MΩ

VUV = 100 VDC

VOV = 450 VDC

DCMAX@100 VDC = 78%

DCMAX@375 VDC = 38%

CONTROL

RLS

2 M

Ω

PI-2517-022604

Input

Voltage

For RIL = 12 kΩ

ILIMIT = 69%

CONTROL

RIL

See Figures 54b, 55b

and 56b for other resistor

values (RIL) to select

different ILIMIT values.

For RIL = 25 kΩ

ILIMIT = 43%

Figure 4. Y/R/F Pkg Line Sense and Externally Set Current Limit.

Figure 5. P/G Package Line Sense.

Figure 6. P/G Package Externally Set Current Limit.

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