TOP221 データシートの表示（PDF） - Power Integrations, Inc

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TOP221

Three-Terminal Off-Line PWM Switch

Power Integrations, Inc 

TOP221-227

CONTROL

VC

ZC

SHUNT REGULATOR/

ERROR AMPLIFIER

5.7 V

5.7 V

4.7 V

0

1

SHUTDOWN/

AUTO-RESTART

+

-

INTERNAL

SUPPLY

∏8

DRAIN

IFB

OSCILLATOR

DMAX

CLOCK

SAW

RE

THERMAL

SHUTDOWN

POWER-UP

RESET

S

Q

R

Q

-

+

PWM

COMPARATOR

S

Q

R

Q

VILIMIT

CONTROLLED

TURN-ON

GATE

DRIVER

LEADING

EDGE

BLANKING

MINIMUM

ON-TIME

DELAY

SOURCE

Figure 2. Functional Block Diagram.

Pin Functional Description

DRAIN Pin:

Output MOSFET drain connection. Provides internal bias

current during start-up operation via an internal switched

high-voltage current source. Internal current sense point.

CONTROL Pin:

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 connection point for the supply bypass and auto-restart/

compensation capacitor.

SOURCE Pin:

YN package – Output MOSFET source connection for high

voltage power return. Primary side circuit

common and reference point.

PN and GN package – Primary-side control circuit common

and reference point.

SOURCE (HV RTN) Pin: (P and G package only)

Output MOSFET source connection for high voltage power

return.

PI-1935-091696

Tab Internally

Connected to SOURCE Pin

Y Package (TO-220/3)

DRAIN

SOURCE

CONTROL

S1

S2

S2

C4

8 S (HV RTN)

7 S (HV RTN)

6 S (HV RTN)

5D

P Package (DIP-8)

G Package (SMD-8)

Figure 3. Pin Configuration.

PI-2084-040401

2

Rev. G 08/16

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