TOP258PN Power Integrations, TOP258PN Datasheet - Page 7
Manufacturer Part Number
IC OFFLINE SWIT PROG OVP 8DIP
Off Line Switcherr
1.TOP252GN-TL.pdf (48 pages)
Specifications of TOP258PN
119 ~ 145kHz
Voltage - Output
-40°C ~ 150°C
Package / Case
8-DIP (0.300", 7.62mm), 7 Leads
Input / Supply Voltage (max)
Input / Supply Voltage (min)
- 0.3 V
Duty Cycle (max)
Operating Temperature Range
- 40 C to + 150 C
Maximum Operating Temperature
+ 150 C
Minimum Operating Temperature
- 40 C
For Use With
596-1193 - KIT REF DESIGN TOP HX FOR TOP258
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
reduction, output overvoltage protection (OVP), external current
limit adjustment, remote ON/OFF and device reset. A
connection to SOURCE pin disables all functions on this pin
and makes TOPSwitch-HX operate in simple three terminal
mode (like TOPSwitch-II).
FREQUENCY (F) Pin (TOP254-258Y, and all E and L packages):
Input pin for selecting switching frequency 132 kHz if connected
to SOURCE pin and 66 kHz if connected to CONTROL pin.
The switching frequency is internally set for ﬁ xed 66 kHz
operation in the P, G, M package and TOP259YN, TOP260YN
SIGNAL GROUND (G) Pin (TOP259YN, TOP260YN &
Return for C pin capacitor and X pin resistor.
SOURCE (S) Pin:
Output MOSFET source connection for high voltage power
return. Primary side control circuit common and reference point.
TOPSwitch-HX Family Functional Description
Like TOPSwitch-GX, TOPSwitch-HX 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 9.
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 and thermal
shutdown, the TOPSwitch-HX incorporates many additional
functions that reduce system cost, increase power supply
performance and design ﬂ exibility. 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, VOLTAGE-MONITOR, and
EXTERNAL CURRENT LIMIT (available in Y and E/L packages),
P/G Package Externally Set Current Limit.
See Figure 55b for other
resistor values (R
select different I
= 12 k
= 19 k
two terminals, VOLTAGE-MONITOR and EXTERNAL CURRENT
LIMIT (available in M package) or one terminal MULTI-FUNCTION
(available in P and G package) have been used to implement
some of the new functions. These terminals can be connected
to the SOURCE pin to operate the TOPSwitch-HX in a
TOPSwitch-like three terminal mode. However, even in this three
terminal mode, the TOPSwitch-HX offers many transparent
features that do not require any external components:
A fully integrated 17 ms soft-start signiﬁ cantly reduces or
eliminates output overshoot in most applications by sweeping
both current limit and frequency from low to high to limit the
peak currents and voltages during start-up.
A maximum duty cycle (DC
storage capacitor, lower input voltage requirement and/or
higher power capability.
Multi-mode operation optimizes and improves the power
supply efﬁ ciency over the entire load range while maintaining
good cross regulation in multi-output supplies.
Control Pin Characteristics (Multi-Mode Operation).
Full Frequency Mode
(constant over load range)
) of 78% allows smaller input
Slope = PWM Gain
Rev. F 01/09