®

TOP221-227

TOPSwitch-II Family

Three-terminal Off-line PWM Switch

Figure 1. Typical Flyback Application.

easier. The standard 8L PDIP package option reduces cost in

lower power, high efficiency applications. The internal lead

frame of this package uses six of its pins to transfer heat from

the chip directly to the board, eliminating the cost of a heat sink.

TOPSwitch incorporates all functions necessary for a switched

mode control system into a three terminal monolithic IC: power

MOSFET, PWM controller, high voltage start up circuit, loop

compensation and fault protection circuitry.

Product Highlights

• Lowest cost, lowest component count switcher solution

• Cost competitive with linears above 5W

• Very low AC/DC losses – up to 90% efficiency

• Built-in Auto-restart and Current limiting

• Latching Thermal shutdown for system level protection

• Implements Flyback, Forward, Boost or Buck topology

• Works with primary or opto feedback

• Stable in discontinuous or continuous conduction mode

• Source connected tab for low EMI

• Circuit simplicity and Design Tools reduce time to market

Description

The second generation TOPSwitch-II family is more cost

effective and provides several enhancements over the first

generation TOPSwitchfamily. The TOPSwitch-II family extends

the power range from 100W to 150W for 100/115/230 VAC

input and from 50W to 90W for 85-265 VAC universal input.

This brings TOPSwitch technology advantages to many new

applications, i.e. TV, Monitor, Audio amplifiers, etc. Many

significant circuit enhancements that reduce the sensitivity to

board layout and line transients now make the design even

PI-1951-091996

AC

IN

D

S

C

CONTROL

TOPSwitch

®

6 W

10 W

15 W

20 W

TOP221Y

TOP222Y

TOP223Y

TOP224Y

TOP225Y

TOP226Y

TOP227Y

9 W

15 W

25 W

30 W

TOP221P or TOP221G

TOP222P or TOP222G

TOP223P or TOP223G

TOP224P or TOP224G

OUTPUT POWER TABLE

.

P

MAX

5,6

PART

ORDER

NUMBER

Single Voltage Input

100/115/230 VAC

3

Wide Range Input

85 to 265 VAC

Single Voltage Input

100/115/230 VAC

3

Wide Range Input

85 to 265 VAC

P

MAX

5,6

7 W

15 W

30 W

45 W

60 W

75 W

90 W

P

MAX

4,6

12 W

25 W

50 W

75 W

100 W

125 W

150 W

P

MAX

4,6

Notes: 1. Package outline: TO-220/3 2. Package Outline: DIP-8 or SMD-8 3. 100/115 VAC with doubler input 4. Assumes appropriate

heat sinking to keep the maximum TOPSwitch junction temperature below 100

in a given application depends on thermal environment, transformer design, efficiency required, minimum specified input voltage, input

storage capacitance, etc. 7. Refer to key application considerations section when using TOPSwitch-II in an existing TOPSwitch design.

PART

ORDER

NUMBER

July 2001