Datasheet TOP242, TOP243, TOP244, TOP245, TOP246, TOP247, TOP248, TOP249, TOP250 (Power Integrations) - 4

TOP242-250 Pin Functional Description FREQUENCY (F) Pin: (Y, R or F package only)
Input pin for selecting switching frequency: 132 kHz if
DRAIN (D) Pin:
connected to SOURCE pin and 66 kHz if connected to High voltage power MOSFET drain output. The internal CONTROL pin. The switching frequency is internally set for start-up bias current is drawn from this pin through a fixed 132 kHz operation in P and G packages. switched high-voltage current source. Internal current limit sense point for drain current.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
CONTROL (C) Pin:
return. Primary side control circuit common and reference Error amplifier and feedback current input pin for duty cycle point. control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used + VUV = IUV x RLS as the connection point for the supply bypass and auto- VOV = IOV x RLS restart/compensation capacitor. For RLS = 2 M PI-2629-092203 R 2 M LS V
LINE-SENSE (L) Pin: (Y, R or F package only)
UV = 100 VDC VOV = 450 VDC Input pin for OV, UV, line feed forward with DC reduction,
DC
MAX DCMAX@100 VDC = 78% remote ON/OFF and synchronization. A connection to
Input D L
DCMAX@375 VDC = 38% SOURCE pin disables all functions on this pin.
Voltage CONTROL C
For RIL = 12 k
EXTERNAL CURRENT LIMIT (X) Pin:
I
S X
LIMIT = 69%
(Y, R or F package only)
See Figure 54b for R Input pin for external current limit adjustment, remote IL other resistor values - 12 k (R ON/OFF, and synchronization. A connection to SOURCE pin IL) to select different ILIMIT values disables all functions on this pin. Figure 4. Y/R/F Pkg 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 DC MAX reduction, external current limit adjustment, remote ON/OFF and synchronization. A connection to SOURCE pin Ω Ω disables all functions on this pin and makes TOPSwitch-GX operate in simple three terminal mode (like TOPSwitch-II).
Y Package (TO-220-7C) Tab Internally 7 D Connected to 5 F SOURCE Pin 4 S 3 X
Figure 5. P/G Package Line Sense.
2 L 1 C R Package (TO-263-7C)
+
F Package (TO-262-7C)
For RIL = 12 k
P Package (DIP-8B)
ILIMIT = 69%
G Package (SMD-8B)
For RIL = 25 k ILIMIT = 43%
M 1 8 S DC
See Figures 54b, 55b
Input S 2 7
and 56b for other resistor
S Voltage
values (R
D M
IL) to select
S
different I
3
LIMIT values.
CONTROL
R
C C
IL
4 5 D 1 2 3 4 5 7 C L X S F D
PI-2724-010802 -
S
Figure 3. Pin Configuration (top view). PI-2517-022604 Figure 6. P/G Package Externally Set Current Limit.
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Rev. R 10/20 www.power.com