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BQ60120HEA30NYS Datasheet(PDF) 11 Page - SynQor Worldwide Headquarters

Part # BQ60120HEA30NYS
Description  Half-brick DC/DC Converter
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

BQ60120HEA30NYS Datasheet(HTML) 11 Page - SynQor Worldwide Headquarters

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Product # BQ60120HEA30
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-2BH612M Rev. B
09/02/05
Page 11
Input:
Input:
Output:
Output:
Current:
Current:
PPackage:
ackage:
35-75 V
35-75 V
12 V
12 V
30 A
30 A
Half-brick
Half-brick
T
Technical S
echnical Specification
pecification
Figure B graphs the relationship between the trim resistor value
and Rtrim-up and Rtrim-down, showing the total range the output
voltage can be trimmed up or down.
Figure B: Trim Graph for 12Vout module
Note: the TRIM feature does not affect the voltage at which the
output over-voltage protection circuit is triggered. Trimming the
output voltage too high may cause the over-voltage protection cir-
cuit to engage, particularly during transients.
It is not necessary for the user to add capacitance at the Trim pin.
The node is internally filtered to eliminate noise.
Total DC Variation of Vout: For the converter to meet its full
specifications, the maximum variation of the DC value of Vout,
due to both trimming and remote load voltage drops, should not
be greater than that specified for the output voltage trim range.
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 appli-
cation note titled “Input System Instability” available on the
SynQor website. 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* 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.
Output Current Limit: If the output current exceeds the
"Output DC Current Limit Inception" point*, then a fast linear cur-
rent limit controller will reduce the output voltage to maintain a
constant output current. There is no minimum operating output
voltage. The converter will run with low on-board power dissi-
pation down to zero output voltage. A redundant circuit will shut-
down the converter if the primary current limit fails.
Back-Drive Current Limit: If there is negative output current
of a magnitude larger than the "Back-Drive Current Limit while
Enabled" specification*, then a fast back-drive limit controller will
increase the output voltage to maintain a constant output current.
If this results in the output voltage exceeding the "Output Over-
Voltage Protection" threshold*, then the unit will shut down. The
full I-V output characteristic can be seen in Figure 19.
Output Over-Voltage Limit: If the voltage across the output
pins exceeds the “Output Over-Voltage Protection” threshold*,
the converter will immediately stop switching. This prevents dam-
age to the load circuit due to 1) excessive series resistance in out-
put current path from converter output pins to sense point, 2) a
release of a short-circuit condition, or 3) a release of a current
limit condition. Load capacitance determines exactly how high
the output voltage will rise in response to these conditions.
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.
Start-up Inhibit Period: If any protection feature causes the
converter to shut down, the converter will attempt to restart after
2ms (typical), the "Startup Inhibit Period".* On initial applica-
tion of input voltage, with the on/off pin set to enable the con-
verter, the "Turn-On Time"* will increase by only 2ms.
* See specification page.
0.0
0.1
1.0
10.0
100.0
1,000.0
10,000.0
0
5
10
15
20
25
30
35
40
45
50
% Increase in Vout
% Decrease in Vout


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