EVL6563S-400W STMicroelectronics, EVL6563S-400W Datasheet - Page 33
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EVL6563S-400W
Manufacturer Part Number
EVL6563S-400W
Description
EVAL BOARD FOR L6563(400W)
Manufacturer
STMicroelectronics
Type
Motor / Motion Controllers & Driversr
Specifications of EVL6563S-400W
Main Purpose
Power Management, Power Factor Correction
Embedded
No
Utilized Ic / Part
L6563
Primary Attributes
400W Power Factor Correction and Preregulator Combination
Secondary Attributes
Transition Mode & Active Tracking Boost Function.
Maximum Operating Temperature
+ 60 C
Product
Power Management Development Tools
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With/related Products
L6563S
Other names
497-10488
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
L6563S
Application information
Figure 45. Interface circuits for power up sequencing when dc-dc has the SS
function
If this is not the case or it is not possible to achieve a start-up delay long enough (because
this prevents the dc-dc stage from starting up correctly) or, simply, the PWM controller is
devoid of soft start, the arrangement of
Figure 46
lets the dc-dc converter start-up when the
voltage generated by the PFC stage reaches a preset value. The technique relies on the
UVLO thresholds of the PWM controller.
Figure 46. Interface circuits for actual power-up sequencing (master PFC)
Another possible use of the RUN and PWM_STOP pins (again, in systems where the PFC
stage is the master) is the brownout protection, thanks to the hysteresis provided.
The brownout protection is basically a not-latched device shutdown function that is activated
when a condition of mains undervoltage is detected. This condition may cause overheating
of the primary power section due to an excess of RMS current. Brownout can also cause the
PFC pre-regulator to work open loop and this could be dangerous to the PFC stage itself
and the downstream converter, should the input voltage return abruptly to its rated value.
Another problem is the spurious restarts that may occur during converter power down and
that cause the output voltage of the converter not to decay to zero monotonically. For these
reasons it is usually preferable to shutdown the unit in case of brownout.
IC shutdown upon brownout can be easily realized as shown in
Figure 47
. The scheme on
the left is of general use, that one on the right can be used if the bias levels of the multiplier
and the R
·C
time constant are compatible with the specified brownout level and with the
FF
FF
specified holdup time respectively. In this latest case, an additional resistor voltage divider
and one capacitor are not needed.
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