TOP250 datasheet(4/54 Pages) POWERINT

4 / 54 page

Rev. R 10/20

TOP242-250

www.power.com

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,

remote ON/OFF and synchronization. A connection to

SOURCE pin disables all functions on this pin.

EXTERNAL CURRENT LIMIT (X) Pin:

(Y, R or F package 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 DC

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)

12 34 57

CL XS FD

Figure 3. Pin Configuration (top view).

Input

Voltage

CONTROL

RIL

RLS

12 k

2 M

VUV = IUV x RLS

VOV = IOV x RLS

For RLS = 2 M

DCMAX@100 VDC = 78%

DCMAX@375 VDC = 38%

For RIL = 12 k

ILIMIT = 69%

See Figure 54b for

other resistor values

(RIL) to select different

ILIMIT values

VUV = 100 VDC

VOV = 450 VDC

Ω

PI-2517-022604

Input

Voltage

For RIL = 12 k

ILIMIT = 69%

CONTROL

RIL

See Figures 54b, 55b

and 56b for other resistor

values (RIL) to select

different ILIMIT values.

For RIL = 25 k

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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