BQ4H136EEC45 Datasheet, PDF (10/13 Pages) SynQor Worldwide Headquarters – Industry standard eighth-brick pin-out configuration

Applications Section
Input: 230-400 V
Output: 13.6 V
Current: 45 A
Package: EXTENDED Eighth-brick
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.
Input Over-Voltage Shutdown: The converter also has
a two stage over-voltage feature that limits the converter's
duty cycle for 100 ms before shutdown and a higher second
level with no delay before shutdown if the input voltage
is too high (See the Input Over-Voltage Shutdown section
in the Electrical Characteristics Table for specific voltage
levels). It also has a hysteresis and time delay to ensure
proper operation.
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 in a period of 1 ms typical (see
Figure C). The shutdown period lasts for a typical period of
250 ms (Figure D) after which the BusQor tries to power up
again (10 ms). If the overload persists, the output voltage
will go through repeated cycles of shutdown and restart
with a duty cycle of 4% (On) and 96% (Off) respectively.
Output
Current
55 A
45 A
Output
Voltage
13.6 V
0V
Time
1 ms
Figure C: Output Overload protection diagram (not to scale)
Output
Current
70 A
peak
Output
Voltage
<13 V
0V
250 ms
10 ms
Time
Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to
scale)
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.
Output Short Circuit Protection: When the output of
the BusQor module is shorted, a peak current of typically
70 A will flow into the short circuit for a period not greater
than 1 ms (typically 200 uS). The output of the BusQor will
shutdown to zero for ~ 250 mS (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 4% (On) and 96% (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 385 V input is about ~10
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 current into the fault may be as low
as 0.04 A typical. See Figure 17 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.
Product # BQ4H136EEC45
Phone [phone]
www.synqor.com
Doc.#005-0006641 Rev. C
05/11/16
Page 10