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PQ50050HPB50 Datasheet(PDF) 13 Page - SynQor Worldwide Headquarters |
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PQ50050HPB50 Datasheet(HTML) 13 Page - SynQor Worldwide Headquarters |
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13 / 14 page  Product # PQ50050HPB50 Phone 1-888-567-9596 www.synqor.com Doc.# 005-0005487 Rev. A 03/18/10 Page 13 Input: Output: Current: Part No.: 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) 200ms Under-Voltage Lockout Turn-On Threshold ON/OFF (Positive logic) Vout Vin 200ms t0 t1 t2 t ON ON OFF OFF 25 ms (typical turn on time) 200ms (typical turn start-up inhibit period time) ON |
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