TOP242YN Power Integrations, TOP242YN Datasheet - Page 5

IC OFFLINE SWIT UVLO HV TO220

TOP242YN

Manufacturer Part Number
TOP242YN
Description
IC OFFLINE SWIT UVLO HV TO220
Manufacturer
Power Integrations
Series
TOPSwitch®-GXr
Type
Off Line Switcherr
Datasheet

Specifications of TOP242YN

Output Isolation
Isolated
Frequency Range
66 ~ 132kHz
Voltage - Output
700V
Power (watts)
22W
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
1.6 mA
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
Through Hole
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
596-1067-5
TOPSwitch-GX Family Functional
Description
Like TOPSwitch, TOPSwitch-GX is an integrated switched
mode power supply chip that converts a current at the control
input to a duty cycle at the open drain output of a high voltage
power MOSFET. During normal operation the duty cycle
of the power MOSFET decreases linearly with increasing
CONTROL pin current as shown in Figure 7.
In addition to the three terminal TOPSwitch features, such as
the high voltage start-up, the cycle-by-cycle current limiting,
loop compensation circuitry, auto-restart, thermal shutdown,
the TOPSwitch-GX incorporates many additional functions that
reduce system cost, increase power supply performance and
design flexibility. A patented high voltage CMOS technology
allows both the high voltage power MOSFET and all the low
voltage control circuitry to be cost effectively integrated onto
a single monolithic chip.
Three terminals, FREQUENCY, LINE-SENSE, and
EXTERNAL CURRENT LIMIT (available in Y, R or F
package) or one terminal MULTI-FUNCTION (available in P
or G package) have been added to implement some of the new
functions. These terminals can be connected to the SOURCE
pin to operate the TOPSwitch-GX in a TOPSwitch-like three
terminal mode. However, even in this three terminal mode, the
TOPSwitch-GX offers many new transparent features that do
not require any external components:
1. A fully integrated 10 ms soft-start limits peak currents
and voltages during start-up and dramatically reduces or
eliminates output overshoot in most applications.
2. DC
of 78% allows smaller input storage capacitor, lower
MAX
input voltage requirement and/or higher power capability.
3. Frequency reduction at light loads lowers the switching
losses and maintains good cross regulation in multiple output
supplies.
4. Higher switching frequency of 132 kHz reduces the
transformer size with no noticeable impact on EMI.
5. Frequency jittering reduces EMI.
6. Hysteretic over-temperature shutdown ensures automatic
recovery from thermal fault. Large hysteresis prevents
circuit board overheating.
7. Packages with omitted pins and lead forming provide large
drain creepage distance.
8. Tighter absolute tolerances and smaller temperature
variations on switching frequency, current limit and PWM gain.
The LINE-SENSE (L) pin is usually used for line sensing by
connecting a resistor from this pin to the rectified DC high
voltage bus to implement line overvoltage (OV), under-voltage
(UV) and line feed-forward with DC
mode, the value of the resistor determines the OV/UV thresholds
and the DC
is reduced linearly starting from a line voltage
MAX
above the under-voltage threshold. See Table 2 and Figure 11.
Auto-restart
132
30
Auto-restart
78
38
10
TOP242-5 1.6 2.0
TOP246-9 2.2 2.6
TOP250
Figure 7. Relationship of Duty Cycle and Frequency to CONTROL
Pin Current.
The pin can also be used as a remote ON/OFF and a
synchronization input.
The EXTERNAL CURRENT LIMIT (X) pin is usually used
to reduce the current limit externally to a value close to the
operating peak current, by connecting the pin to SOURCE
through a resistor. This pin can also be used as a remote
ON/OFF and a synchronization input in both modes. See
Table 2 and Figure 11.
For the P or G packages the LINE-SENSE and EXTERNAL
CURRENT LIMIT pin functions are combined on one MULTI-
FUNCTION (M) pin. However, some of the functions become
mutually exclusive as shown in Table 3.
The FREQUENCY (F) pin in the Y, R or F package sets the
reduction. In this
switching frequency to the default value of 132 kHz when
MAX
connected to SOURCE pin. A half frequency option of
66 kHz can be chosen by connecting this pin to CONTROL pin
instead. Leaving this pin open is not recommended.
TOP242-250
I
I
CD1
B
= 125 µA
I
L
= 190 µA
I
L
I
(mA)
C
I
I
CD1
B
Slope = PWM Gain
= 125 µA
I
L
I
= 190 µA
L
2.4 2.7
I
(mA)
C
Note: For P and G packages I
is replaced with I
L
I
< I
L
L(DC)
I
< I
L
L(DC)
5.2
6.0
5.8
6.6
6.5
7.3
.
M
PI-2633-011502
5
O
11/05

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