TOP246YN Power Integrations, TOP246YN Datasheet - Page 24

IC OFFLINE SWIT UVLO HV TO220

TOP246YN

Manufacturer Part Number
TOP246YN
Description
IC OFFLINE SWIT UVLO HV TO220
Manufacturer
Power Integrations
Series
TOPSwitch®-GXr
Type
Off Line Switcherr
Datasheet

Specifications of TOP246YN

Output Isolation
Isolated
Frequency Range
66 ~ 132kHz
Voltage - Output
700V
Power (watts)
125W
Operating Temperature
-40°C ~ 150°C
Package / Case
TO-220-7 (Formed Leads), 5 Leads
Output Voltage
12 V
Input / Supply Voltage (max)
265 VAC
Input / Supply Voltage (min)
85 VAC
Duty Cycle (max)
83 %
Switching Frequency
132 KHz
Supply Current
2.2 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
No. Of Outputs
1
Output Current
4.32A
No. Of Pins
6
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
596-1077-5

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Manufacturer
Quantity
Price
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POWER
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POWER
Quantity:
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Figure 45. Remote ON/OFF using Microcontroller.
Processor Controlled Supply Turn On/Off
A low cost momentary contact switch can be used to turn
the TOPSwitch-GX power on and off under microprocessor
control, which may be required in some applications such as
printers. The low power remote OFF feature allows an
elegant implementation of this function with very few external
components, as shown in Figure 45. Whenever the push
button momentary contact switch P1 is closed by the user, the
optocoupler U3 is activated to inform the microprocessor of
this action. Initially, when the power supply is off (M pin is
floating), closing of P1 turns the power supply on by shorting
the M pin of the TOPSwitch-GX to SOURCE through a diode
(remote ON). When the secondary output voltage V
established, the microprocessor comes alive and recognizes that
the switch P1 is closed through the switch status input that is
driven by the optocoupler U3 output. The microprocessor then
sends a power supply control signal to hold the power supply
in the on-state through the optocoupler U4. If the user presses
the switch P1 again to command a turn off, the microprocessor
detects this through the optocoupler U3 and initiates a shutdown
procedure that is product specific. For example, in the case of
the inkjet printer, the shutdown procedure may include safely
24
TOP242-250
High Voltage
+
DC Input
U4
O
11/05
U3
1N4148
P1
1 nF
C
M
D
S
CONTROL
M
F
27 kΩ
TOPSwitch-GX
U1
C
47 µF
CC
is
parking the print heads in the storage position. In the case of
products with a disk drive, the shutdown procedure may include
saving data or settings to the disk. After the shutdown procedure
is complete, when it is safe to turn off the power supply, the
microprocessor releases the M pin by turning the optocoupler
U4 off. If the manual switch and the optocouplers U3 and U4
are not located close to the M pin, a capacitor C
to prevent noise coupling to the pin when it is open.
The power supply could also be turned on remotely through
a local area network or a parallel or serial port by driving the
optocoupler U4 input LED with a logic signal. Sometimes it is
easier to send a train of logic pulses through a cable (due to AC
coupling of cable, for example) instead of a DC logic level as
a wake up signal. In this case, a simple RC filter can be used
to generate a DC level to drive U4 (not shown in Figure 45).
This remote on feature can be used to wake up peripherals
such as printers, scanners, external modems, disk drives, etc.,
as needed from a computer. Peripherals are usually designed
to turn off automatically if they are not being used for a period
of time, to save power.
U2
LTV817A
100 kΩ
U3
P1 Switch
Status
LOGIC
INPUT
PROCESSOR/
CONTROLLER
MICRO-
OUTPUT
LOGIC
LTV817A
U4
6.8 kΩ
ON/OFF
Control
Supply
Power
M
Wake-up
External
1N4148
may be needed
Signal
PI-2561-030805
RETURN
(+5 V)
V
6.8 kΩ
CC

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