TOP242 Power Integrations Inc., TOP242 Datasheet - Page 4

• Manufacturer Part Number: TOP242
• Description: Family Extended Power/ Design Flexible/Integrated Off-line Switcher
• Manufacturer: Power Integrations Inc.

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 or R package only)
Input pin for OV, UV, line feed forward with DC
remote ON/OFF and synchronization. A connection to SOURCE
pin disables all functions on this pin.
EXTERNAL CURRENT LIMIT (X) Pin: (Y or R 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
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 or R package only)
Input pin for selecting switching frequency: 132 kHz if
Figure 3. Pin Configuration (top view).
4
M
C
TOP242-249
S
S
G Package (SMD-8B)
P Package (DIP-8B)
Connected to
Tab Internally
SOURCE Pin
3
4
2
E
7/01
1
Y Package (TO-220-7C)
August 8, 2000
8
7
5
S
D
S
(TO-263-7C)
R Package
C L X S F
1 2 3 4 5
D
7
MAX
PI-2724-033001
reduction,
7 D
5 F
4 S
3 X
2 L
1 C
MAX
Figure 6. P/G Package Externally Set Current Limit.
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.
Figure 4. Y/R Package Line Sense and Externally Set Current
Figure 5. P/G Package Line Sense.
Voltage
Voltage
Voltage
Input
Input
Input
DC
DC
DC
Limit.
+
+
+
-
-
-
R
IL
D
S
D
S
D
S
R
R
CONTROL
CONTROL
CONTROL
LS
LS
X
12 kΩ
R
M
M
L
2 MΩ
IL
2 MΩ
C
C
C
For R
DC
DC
For R
DC
DC
For R
For R
See fig. 55 for other
resistor values (R
V
V
V
V
to select different
I
For R
I
See fig. 55 for other
resistor values (R
to select different I
values
LIMIT
LIMIT
V
V
V
V
MAX
MAX
UV
OV
UV
OV
MAX
MAX
UV
OV
UV
OV
LS
LS
I
I
= I
= I
= 100 VDC
= 450 VDC
@100 VDC = 78%
@375 VDC = 38%
@100 VDC = 78%
@375 VDC = 38%
LIMIT
LIMIT
= I
= I
= 100 VDC
= 450 VDC
values
IL
IL
= 69%
IL
= 2 MΩ
= 2 MΩ
OV
UV
= 12 kΩ
= 25 kΩ
OV
UV
= 12 kΩ
x R
x R
= 69%
= 43%
PI-2629-040501
x R
x R
PI-2517-040501
PI-2509-040501
LS
LS
LS
LS
IL
IL
LIMIT
)
)