TOP242-249
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.
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.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
return. Primary side control circuit common and reference point.
CONTROL (C) Pin:
VUV = IUV x RLS
VOV = IOV x RLS
+
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.
For RLS = 2 MΩ
2 MΩ
RLS
VUV = 100 VDC
OV = 450 VDC
V
DC
Input
Voltage
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
D
S
L
CONTROL
LINE-SENSE (L) Pin: (Y or R package only)
C
Input pin for OV, UV, line feed forward with DCMAX reduction,
remoteON/OFFandsynchronization. AconnectiontoSOURCE
pin disables all functions on this pin.
For RIL = 12 kΩ
LIMIT = 69%
I
X
See fig. 55 for other
resistor values (RIL)
to select different ILIMIT
RIL
12 kΩ
-
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.
values
PI-2629-040501
Figure 4. Y/R Package Line Sense and Externally Set Current
Limit.
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).
+
VUV = IUV x RLS
VOV = IOV x RLS
For RLS = 2 MΩ
RLS
2 MΩ
V
V
UV = 100 VDC
OV = 450 VDC
DC
Input
Voltage
DCMAX@100 VDC = 78%
DCMAX@375 VDC = 38%
D
S
M
CONTROL
C
FREQUENCY (F) Pin: (Y or R package only)
Input pin for selecting switching frequency: 132 kHz if
-
Y Package (TO-220-7C)
PI-2509-040501
Tab Internally
Connected to
SOURCE Pin
7
D
Figure 5. P/G Package Line Sense.
5
4
3
2
1
F
S
X
L
C
+
For RIL = 12 kΩ
ILIMIT = 69%
R Package
(TO-263-7C)
For RIL = 25 kΩ
P Package (DIP-8B)
G Package (SMD-8B)
ILIMIT = 43%
DC
Input
Voltage
See fig. 55 for other
resistor values (RIL)
to select different
M
S
S
S
1
2
8
7
D
S
M
I
LIMIT values
CONTROL
C
RIL
S
C
3
4
5
-
D
1 2 3 4 5
C L X S F
7
D
PI-2517-040501
PI-2724-033001
Figure 3. Pin Configuration (top view).
Figure 6. P/G Package Externally Set Current Limit.
E
7/01
August 8, 2000
4
POWERINT [ Power Integrations ]
