TOP258PN Power Integrations, TOP258PN Datasheet - Page 31

IC OFFLINE SWIT PROG OVP 8DIP

TOP258PN

Manufacturer Part Number
TOP258PN
Description
IC OFFLINE SWIT PROG OVP 8DIP
Manufacturer
Power Integrations
Series
TOPSwitch®-HXr
Type
Off Line Switcherr
Datasheet

Specifications of TOP258PN

Output Isolation
Isolated
Frequency Range
119 ~ 145kHz
Voltage - Output
700V
Power (watts)
77W
Operating Temperature
-40°C ~ 150°C
Package / Case
8-DIP (0.300", 7.62mm), 7 Leads
Output Voltage
700 V
Input / Supply Voltage (max)
9 V
Input / Supply Voltage (min)
- 0.3 V
Duty Cycle (max)
78 %
Switching Frequency
132 KHz
Operating Temperature Range
- 40 C to + 150 C
Mounting Style
SMD/SMT
Maximum Operating Temperature
+ 150 C
Minimum Operating Temperature
- 40 C
Output Current
6.88 A
Output Power
48 W
For Use With
596-1193 - KIT REF DESIGN TOP HX FOR TOP258
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
596-1189-5
Figure 50c. Layout Considerations for TOPSwitch-HX Using L-Package and Operating at 132 kHz.
Quick Design Checklist
In order to reduce the no-load input power of TOPSwitch-HX
designs, the V-pin (or M-pin for P Package) operates at very
low current. This requires careful layout considerations when
designing the PCB to avoid noise coupling. Traces and
components connected to the V-pin should not be adjacent to
any traces carrying switching currents. These include the drain,
clamp network, bias winding return or power traces from other
converters. If the line sensing features are used, then the sense
resistors must be placed within 10 mm of the V-pin to minimize
the V pin node area. The DC bus should then be routed to the
line sense resistors. Note that external capacitance must not
be connected to the V-pin as this may cause misoperaton of the
V pin related functions.
As with any power supply design, all TOPSwitch-HX designs
should be verifi ed on the bench to make sure that components
specifi cations are not exceeded under worst-case conditions.
The following minimum set of tests is strongly recommended:
1.
www.powerint.com
HV
Maximum drain voltage – Verify that peak V
exceed 675 V at highest input voltage and maximum
overload output power. Maximum overload output power
occurs when the output is overloaded to a level just before
the power supply goes into auto-restart (loss of regulation).
+
-
Input Filter
Capacitor
J1
JP1
Note: Components U1, R8, C8, C9 and R22
are under heat sink HS1.
C4
HS1
R22
U1
Y
X
R8
C8
C
DS
F
does not
S
R6
D
VR1
C9
VR2
C6
D5
R7
R9
D6
R10
C10
T1
JP2
2.
3.
Design Tools
Up-to-date information on design tools can be found at the
Power Integrations website: www.powerint.com
Transformer
Isolation Barrier
Maximum drain current – At maximum ambient temperature,
maximum input voltage and maximum output load, verify
drain current waveforms at start-up for any signs of trans-
former saturation and excessive leading edge current spikes.
TOPSwitch-HX has a leading edge blanking time of 220 ns
to prevent premature termination of the ON-cycle. Verify that
the leading edge current spike is below the allowed current
limit envelope (see Figure 53) for the drain current waveform
at the end of the 220 ns blanking period.
Thermal check – At maximum output power, both minimum
and maximum voltage and ambient temperature; verify that
temperature specifi cations are not exceeded for
TOPSwitch-HX, transformer, output diodes and output
capacitors. Enough thermal margin should be allowed for
the part-to-part variation of the R
specifi ed in the data sheet. The margin required can either
be calculated from the values in the parameter table or it can
be accounted for by connecting an external resistance in
series with the DRAIN pin and attached to the same heat
sink, having a resistance value that is equal to the difference
between the measured R
the worst case maximum specifi cation.
Capacitor
Y1-
C7
U2
R15
U4
R13
R17
C21
DS(ON)
D8
R21
C16
C17
C18
of the device under test and
TOP252-262
R20
DS(ON)
- DC
Out
R12
+
of TOPSwitch-HX, as
J2
C19
L3
Output Filter
HS2
Capacitor
PI-5216-091508
Rectifier
Output
Rev. F 01/09
31

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