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PQ50090QGB11 Datasheet(PDF) 12 Page - SynQor Worldwide Headquarters

Part No. PQ50090QGB11
Description  Input under-voltage lockout disables converter at low input voltage
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Manufacturer  SYNQOR [SynQor Worldwide Headquarters]
Direct Link  http://www.synqor.com
Logo SYNQOR - SynQor Worldwide Headquarters

PQ50090QGB11 Datasheet(HTML) 12 Page - SynQor Worldwide Headquarters

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Technical Specification
Product # PQ50090QGB11
Phone 1-888-567-9596
www.synqor.com
Doc.# 005-0005485 Rev. A
03/29/10
Page 12
Input:48V
Output:9.0V
Current:11A
Part No.:PQ50090QGB11
Startup Inhibit Period: The Startup Inhibit Period ensures that
the converter will remain off for approximately 200ms when it is
shut down for any reason. When an output short is present, this
generates a 5Hz “hiccup mode,” which prevents the converter
from overheating. In all, there are seven ways that the converter
can be shut down, initiating a Startup Inhibit Period:
• Input Under-Voltage Lockout
• Input Over-Voltage Shutdown (not present in Quarter-brick)
• Output Over-Voltage Protection
• Over Temperature Shutdown
• Current Limit
• Short Circuit Protection
• Turned off by the ON/OFF input
Figure F shows three turn-on scenarios, where a Startup Inhibit
Period is initiated at t0, t1, and t2:
Before time t0, when the input voltage is below the UVL threshold,
the unit is disabled by the Input Under-Voltage Lockout feature.
When the input voltage rises above the UVL threshold, the Input
Under-Voltage Lockout is released, and a Startup Inhibit Period is
initiated. At the end of this delay, the ON/OFF pin is evaluated,
and since it is active, the unit turns on.
At time t1, the unit is disabled by the ON/OFF pin, and it cannot
be enabled again until the Startup Inhibit Period has elapsed.
When the ON/OFF pin goes high after t2, the Startup Inhibit
Period has elapsed, and the output turns on within the typical
Turn-On Time.
Figure F: Startup Inhibit Period (turn-on time not to scale)
Under-Voltage
Lockout Turn-
On Threshold
ON/OFF
(neg logic)
Vout
Vin
200ms
200ms
200ms
(typical start-up
inhibit period)
t0
t1
t2
t
8ms (typical
turn on time)
ON
ON
ON
OFF
OFF


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