TOP258PN Power Integrations, TOP258PN Datasheet - Page 10

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

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
TOP258PN
Manufacturer:
PowerInt
Quantity:
2 100
Part Number:
TOP258PN
Manufacturer:
PANASONIC
Quantity:
230
Part Number:
TOP258PN
Manufacturer:
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Quantity:
1 017
Figure 11. Typical Waveforms for (1) Power Up (2) Normal Operation (3) Auto-Restart (4) Power Down.
On-Chip Current Limit with External Programmability
The cycle-by-cycle peak drain current limit circuit uses the
output MOSFET ON-resistance as a sense resistor. A current
limit comparator compares the output MOSFET on-state drain
to source voltage V
current causes V
the output MOSFET off until the start of the next clock cycle.
The current limit comparator threshold voltage is temperature
compensated to minimize the variation of the current limit due
to temperature related changes in R
The default current limit of TOPSwitch-HX is preset internally.
However, with a resistor connected between EXTERNAL
CURRENT LIMIT (X) pin (Y, E/L and M packages) or MULTI-
FUNCTION (M) pin (P and G package) and SOURCE pin (for
TOP259-261 Y, the X pin is connected to the SIGNAL GROUND
(G) pin), current limit can be programmed externally to a lower
level between 30% and 100% of the default current limit. By
setting current limit low, a larger TOPSwitch-HX than necessary
for the power required can be used to take advantage of the
lower R
requirements. TOPSwitch-HX current limit reduction initial
tolerance through the X pin (or M pin) has been improved
signifi cantly compare with previous TOPSwitch-GX. With a
second resistor connected between the EXTERNAL CURRENT
LIMIT (X) pin (Y, E/L and M packages) or MULTI-FUNCTION (M)
pin (P and G package) and the rectifi ed DC high voltage bus,
the current limit is reduced with increasing line voltage, allowing
a true power limiting operation against line variation to be
implemented. When using an RCD clamp, this power limiting
technique reduces maximum clamp voltage at high line. This
allows for higher refl ected voltage designs as well as reducing
clamp dissipation.
The leading edge blanking circuit inhibits the current limit
comparator for a short time after the output MOSFET is turned
Rev. F 01/09
10
V
V
V
Note: S0 through S15 are the output states of the auto-restart counter
C
LINE
0 V
0 V
DRAIN
0 V
V
0 V
DS(ON)
OUT
TOP252-262
for higher effi ciency/smaller heat sinking
V
UV
DS(ON)
1
DS(ON)
to exceed the threshold voltage and turns
S15
with a threshold voltage. High drain
S14
2
DS(ON)
S13 S12
of the output MOSFET.
S0
S15
3
S14
S13 S12
on. The leading edge blanking time has been set so that, if a
power supply is designed properly, current spikes caused by
primary-side capacitances and secondary-side rectifi er reverse
recovery time should not cause premature termination of the
switching pulse.
The current limit is lower for a short period after the leading
edge blanking time. This is due to dynamic characteristics of
the MOSFET. During startup and fault conditions the controller
prevents excessive drain currents by reducing the switching
frequency.
Line Undervoltage Detection (UV)
At power up, UV keeps TOPSwitch-HX off until the input line
voltage reaches the undervoltage threshold. At power down,
UV prevents auto-restart attempts after the output goes out of
regulation. This eliminates power down glitches caused by slow
discharge of the large input storage capacitor present in
applications such as standby supplies. A single resistor
connected from the VOLTAGE-MONITOR pin (Y, E/L and M
packages) or MULTI-FUNCTION pin (P and G packages) to the
rectifi ed DC high voltage bus sets UV threshold during power
up. Once the power supply is successfully turned on, the UV
threshold is lowered to 44% of the initial UV threshold to allow
extended input voltage operating range (UV low threshold). If
the UV low threshold is reached during operation without the
power supply losing regulation, the device will turn off and stay
off until UV (high threshold) has been reached again. If the
power supply loses regulation before reaching the UV low
threshold, the device will enter auto-restart. At the end of each
auto-restart cycle (S15), the UV comparator is enabled. If the
UV high threshold is not exceeded, the MOSFET will be
disabled during the next cycle (see Figure 11). The UV feature
can be disabled independent of the OV feature.
S0
S15
2
S14
S13
S12
4
S0
S15
S15
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4.8 V
PI-4531-121206
5.8 V

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