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BQ55120ETL16NKS Datasheet(PDF) 10 Page - SynQor Worldwide Headquarters |
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BQ55120ETL16NKS Datasheet(HTML) 10 Page - SynQor Worldwide Headquarters |
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10 / 13 page  Product # BQ55120ETL16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2BE552B Rev. A 03/16/06 Page 10 Input: Input: Output: Output: Current: Current: PPackage: ackage: 35-55 V 35-55 V 12 V 12 V 16 A 16 A (192W) (192W) Eighth-brick Eighth-brick T Technical S echnical Specification pecification Output Current Limit: The output of the BusQor module is electronically protected against output overloads. When an over- load current greater than the “DC Current-Limit Inception” speci- fication is drawn from the output, the output shuts down to zero volts in a period of 10mS typical (see Figure C). The shutdown period lasts for a typical period of 250mS (Figure D) after which the BusQor tries to power up again. 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. 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 34A will flow into the short circuit for a period of about 10mS. The out- put of the BusQor will shutdown to zero volts for the same period (Figure E). The shutdown period lasts for a period of 250mS, at the end of which the BusQor module tries to power up again. If the short circuit persists, the output voltage will go through repeat- ed cycles of shutdown and restart with a duty cycle of 4% (On) and 96% (Off) respectively. The BusQor module returns (auto recovery) to normal operation once the short circuit is removed. The BusQor is designed to survive in this mode indefinitely with- out damage and without human intervention. In the Auto recovery mode, also referred to as “Hiccup” mode, the power drawn from the 48V input is about 5 Watts, most of which is dissipated into the external fault. It is important that cop- per traces and pads from the output circuit be designed to with- stand the short term peaks, although the average current into the fault may be as low as 2A typical. See Figure 17 for appropri- ate 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. APPLICATION CONSIDERATIONS Start-Up Inhibit Period: Figure E details the Start-Up Inhibit Period for the BusQor module. At time t0, when Vin is applied with On/Off pin asserted (enabled), the BusQor output begins to build up. Before time t1, 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 typical Startup Inhibit Period of 3mS is initiated. The output builds up to 90% or higher of the nominal voltage and stabilizes at the nominal value of 12.0V. The rise time from 0V to 90% is 1.5mS typical. At time t2, when the On/Off pin is de-asserted (disabled), the BusQor output instantly drops to 0V. Fall time from 12.0V to 0V is dependent on output capacitance and any parasitic trace inductance in the output load circuit. At time t3, when the On/Off pin is re-asserted (enabled), the BusQor module output begins to build up after the inhibit period of 3mS typical. Refer to the Control Features section of the data sheet for details on enabling and disabling methods for N and P logic type mod- ules. Output Current Output Voltage 12V 25A 16A 10ms 0V Figure C: Output Overload protection diagram (not to scale) Output Current Output Voltage 12V 34A peak 250ms 10ms 0V Figure D: Output Short Circuit and Auto-Resetting protection diagram (not to scale) Time Time |
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