®
TOP221-227
TOPSwitch-II
Family
Three-terminal Off-line PWM Switch
Product Highlights
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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
®
AC
IN
D
CONTROL
TOPSwitch
S
C
PI-1951-091996
Description
The second generation
TOPSwitch-II
family is more cost
effective and provides several enhancements over the first
generation
TOPSwitch
family. 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
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.
OUTPUT POWER TABLE
TO-220 (Y) Package
1
Single Voltage Input
PART
ORDER
100/115/230 VAC
±
15%
P
MAX4,6
NUMBER
3
Wide Range Input
85 to 265 VAC
P
MAX4,6
7W
15 W
30 W
45 W
60 W
75 W
90 W
8L PDIP (P) or 8L SMD (G) Package
2
Single Voltage
.
Input
3
Wide Range Input
PART
100/115/230 VAC
±
15%
85 to 265 VAC
ORDER
P
MAX5,6
P
MAX5,6
NUMBER
TOP221P or TOP221G
TOP222P or TOP222G
TOP223P or TOP223G
TOP224P or TOP224G
9W
15 W
25 W
30 W
6W
10 W
15 W
20 W
TOP221Y
TOP222Y
TOP223Y
TOP224Y
TOP225Y
TOP226Y
TOP227Y
12 W
25 W
50 W
75 W
100 W
125 W
150 W
Notes:
1.
Package outline: Y03A
2.
Package Outline: P08A or G08A
3.
100/115 VAC with doubler input
4.
Assumes appropriate heat
sinking to keep the maximum
TOPSwitch
junction temperature below 100˚ C.
5.
Soldered to 1 sq. in.( 6.45 cm
2
), 2 oz. copper clad
(610 gm/m
2
)
6.
P
MAX
is the maximum practical continuous power output level for conditions shown. The continuous power capability
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.
December 1997