TOP246 データシートの表示（PDF） - Power Integrations, Inc

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TOP246

Extended power, design elexible, integrated off-line switcher

Power Integrations, Inc 

TOP242-250

Pin Functional Description

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

Input pin for selecting switching frequency: 132 kHz if

DRAIN (D) Pin:

High voltage power MOSFET drain output. The internal

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

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.

high-voltage current source. Internal current limit sense point

for drain current.

SOURCE (S) Pin:

Output MOSFET source connection for high voltage power

CONTROL (C) Pin:

return. Primary side control circuit common and reference point.

Error amplifier and feedback current input pin for duty cycle

control. Internal shunt regulator connection to provide inter-

+

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

VUV = IUV x RLS

VOV = IOV x RLS

connection point for the supply bypass and auto-restart/

compensation capacitor.

RLS 2 MΩ For RLS = 2 MΩ

VUV = 100 VDC

VOV = 450 VDC

General Information & Table of Contents LINE-SENSE (L) Pin: (Y, R or F package only)

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

MAX

DC

Input

Voltage

D

L

DCMAX@100 VDC = 78%

CONTROL DCMAX@375 VDC = 38%

C

remote ON/OFF and synchronization. A connection to

For RIL = 12 kΩ

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

S

X

ILIMIT = 69%

Product Selector Guide -

RIL

12 kΩ

See fig. 55 for other

resistor values (RIL)

to select different ILIMIT

Data Sheets values PI-2629-040501

1

2

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

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

disables all functions on this pin.

Limit. Application Notes 3

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

DCMAX 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).

+

Design Ideas 4 VUV = IUV x RLS

VOV = IOV x RLS

DC

Input

Design Tools RLS

2 MΩ

For RLS = 2 MΩ

VUV = 100 VDC

VOV = 450 VDC

5

Voltage

DCMAX@100 VDC = 78%

QualiDtyCONaTMRnOLd Reliability DCMAX@375 VDC = 38% 6

C

Y Package (TO-220-7C)

- PacSkage Information 7

PI-2509-040501

Tab Internally

7D

Connected to

SOURCE Pin

5F

4S

DPA-Switch DC-DC Figure 5. P/G Package Line Sense. Seminar 8

3X

R

2L

PackLagien(TkOS-2w63-i17tCCc) h

&

+

TinySwitch-II

AC-DC Seminar For RIL = 12 kΩ

ILIMIT = 69%

9

F Package (TO-262-7C)

P Package (DIP-8B)

TOPSwitch-GX AC-DC Seminar 10 G Package (SMD-8B)

M1

Sales Representatives and Distributors 11 S 2

8S

7S

DC

Input

Voltage

D

M

CONTROL

For RIL = 25 kΩ

ILIMIT = 43%

See fig. 55 for other

resistor values (RIL)

to select different

ILIMIT values

RIL

C

S3

C4

5D

1234 5 7

C L X S F D PI-2724-010802

-

S

PI-2517-040501

Figure 3. Pin Configuration (top view).

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

4

H

9/02

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