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BQ57120EZB38 Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters

Part No. BQ57120EZB38
Description  Output over-voltage protection
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Maker  SYNQOR [SynQor Worldwide Headquarters]
Homepage  http://www.synqor.com
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BQ57120EZB38 Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters

 
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Input:
40-65V
Output:
12.0V
Current:
38A
Package:
Eighth-brick
Product # BQ57120EZB38
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0006442 Rev. D
02/17/16
Page 10
Input:
40-65V
Output:
12.0V
Current:
38A
Package:
Eighth-brick
Applications Section
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping avoid
an input system instability problem, described in more detail
in the application note titled “Input System Instability”. The
lockout circuitry is a comparator with DC hysteresis. When
the input voltage is rising, it must exceed the typical Turn-
On Voltage Threshold value (listed on the specification page)
before the converter will turn on. Once the converter is on,
the input voltage must fall below the typical Turn-Off Voltage
Threshold value before the converter will turn off. Also see
Figure E.
Output Current Limit: The output of the BusQor module
is electronically protected against output overloads. When
an overload current greater than the “DC Current-Limit
Inception” specification is drawn from the output, the output
shuts down to zero volt after a typical period of 1ms (see
Figure C). The shutdown period lasts for a typical period of
200ms (Figure D) after which the BusQor tries to power up
again (20ms). If the overload persists, the output voltage
will go through repeated cycles of shutdown and restart with
a duty cycle of 10% (On) and 90% (Off) respectively. The
BusQor module returns (auto resetting) to normal operation
once the overload is removed. The BusQor is designed to
survive in this mode indefinitely without damage and without
human intervention. To insure the current limit set point is
within the range specified in the electrical characteristics
table, adding an input inductor is recommended.
This
design does not have an "on-board" input inductor like most
other SynQor products. the value of the inductor should be
selected so that the resonant frequency of this inductor and
the "on board" input capacitance is below (with margin) the
input ripple frequency (2*fs).
Output Short Circuit Protection: When the output of the
BusQor module is shorted, a peak current of typically 85
A will flow into the short circuit for a period of about 10
-20ms. The output of the BusQor will shutdown to zero for
~ 200ms (Figure D). At the end of the shutdown period
the BusQor module tries to power up again. If the short
circuit persists, the output voltage will go through repeated
cycles of shutdown and restart with a duty cycle of 10%
(On) and 90% (Off) respectively. The BusQor module
returns (auto resetting) to normal operation once the short
circuit is removed. The BusQor is designed to survive in
this mode indefinitely without damage and without human
intervention.
In the Auto resetting mode, also referred to as “Hiccup”
mode, the power drawn from the 48V input is about 6 Watts,
most of which is dissipated into the external fault. It is
important that copper traces and pads from the output circuit
be designed to withstand the short term peaks, although the
average input current into the fault may be as low as 0.13 A
typical. See Figure 18 for appropriate waveform.
Over-Temperature Shutdown: A temperature sensor
on the converter senses the average temperature of the
module. The thermal shutdown circuit is designed to turn the
converter off when the temperature at the sensed location
reaches the Over-Temperature Shutdown value. It will allow
the converter to turn on again when the temperature of the
sensed location falls by the amount of the Over-Temperature
Shutdown Restart Hysteresis value.
Output
Current
Output
Voltage
0V
Time
Time
Output
Current
Output
Voltage
0V
Figure C: Output Overload protection diagram (not to scale)
Output
Current
52A
38A
Output
Voltage
12V
0V
1ms
Time
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
85 A
peak
<12V
220ms
20ms
column 3
column 4


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