PFS7323-7329
Hysteretic Thermal Shutdown
after the thermal fault is below IUV+, OTP hysteresis is disabled,
however if the peak input voltage after the thermal fault is above
IUV+ then the OTP hysteresis is enabled prior to re-initiating the
soft-start sequence.
The thermal shutdown circuitry senses the controller die
temperature. The threshold is set at 117 °C typical with a 49 °C
hysteresis. When the die temperature rises above this threshold
(OTP) (117 °C +8/-7 °C), the controller initiates a fast soft-
shutdown and remains disabled until the die temperature falls
by ~49°C, at which point the device will re-initiate the soft-start
sequence.
The maximum time delay for soft-shutdown to occur after an
OTP event is detected is tREFRESH
.
In the event the input voltage is reduced below the brown-in
threshold and an OTP event occurs (no OTP hysteresis) and the
input voltage is raised immediately above brown-in before the
controller junction temperature falls below the OTP threshold,
the controller will initiate a soft-start once the controller junction
is just below the OTP threshold. Depending on the system
thermal conditions, the controller could initiate OTP shutdown
again because of insufficient time to cool down the controller.
The OTP shutdown that occurs when the input voltage is above
brown-in will have hysteresis enabled.
In the event an OTP is detected when the VOLTAGE MONITOR
pin current is below IUV+ threshold, the device will initiate a
soft-shutdown and remain disabled until all the conditions for
the start-up (soft-start sequence) are satisfied. In this mode of
operation the OTP hysteresis is disabled.
When soft-shutdown is initiated by an over-temperature fault
(OTP) the brown-out timer delay (tBROWN-OUT) is disabled. The
behavior of OTP depends on the input voltage peak detected
following the thermal fault. If the input peak voltage detected
Output Power Table
eSIP Package
Efficiency Power Mode R = 49.9 kW
Maximum Continuous
Full Power Mode R = 24.9 kW
Maximum Continuous
Product
Output Power Rating at
Output Power Rating at
Peak Output Power
Rating at 90 VAC4
Peak Output Power
Rating at 90 VAC4
90 VAC2
90 VAC2
Minimum3
60 W
Maximum
80 W
Minimum3
85 W
Maximum
110 W
PFS7323L
PFS7324L
PFS7325L
PFS7326H
PFS7327H
PFS7328H
PFS7329H
90 W
120 W
165 W
205 W
255 W
310 W
345 W
120 W
150 W
205 W
260 W
320 W
385 W
425 W
80 W
110 W
150 W
185 W
230 W
280 W
320 W
100 W
140 W
180 W
220 W
270 W
293 W
130 W
185 W
230 W
290 W
350 W
380 W
110 W
140 W
175 W
210 W
235 W
Table 2. Output Power Table.
Notes:
1. See Key Application considerations.
2. Maximum practical continuous power at 90 VAC in an open-frame design with adequate heat sinking, measured at 50 °C ambient.
3. Recommended lower range of maximum continuous power for best light load efficiency; HiperPFS-2 will operate and perform below this level.
4. Internal output power limit.
11
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Rev. B 06/13
POWERINT [ Power Integrations ]
