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SP6120CY Datasheet(PDF) 10 Page - Sipex Corporation |
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SP6120CY Datasheet(HTML) 10 Page - Sipex Corporation |
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10 / 13 page  10 Date: 5/25/04 SP6120 Low Voltage, AnyFETTM, Synchronous, Buck Controller © Copyright 2004 Sipex Corporation TIME 3% Low Enable Voltage V(VCC) 0V SWN Voltage V(VCC) 0V FAULT Reset Voltage V(VCC) 0V Inductor Current ILOAD 0V Error Amplifier Reference Voltage 0V 1.25V VOUT = V(Eamp REF)* (1+RF/RI) SS Voltage 0V 0.25V 0.7V 2.0V 2.4V dVSS/dt = 50µA/CSS V(ISP) - V(ISN) 0V 250mV V(VCC) 0V 0V 2.0V SS Voltage FAULT Voltage 2.4V 43mV finite propagation delay of the controller. When the SS voltage reaches 2.0V, the secondary loop including the 3% window comparator is en- abled. Lastly, the SS voltage is clamped at 2.4V, ending the soft start charge cycle. Hiccup Mode When the converter enters a fault mode, the driver holds the high side and low side MOSFETs off for a finite period of time. Provided the part is enabled, this time is set by the discharge of the SS capacitor. The discharge time is roughly 10 times the charge interval thereby giving the power supply plenty of time to cool during an over current fault. The driver off-time is pre- dominantly determined by the discharge time. Restart will occur just like a normal soft start cycle. However, if a fault occurs during the soft start charge cycle, the FAULT latch is immediately set, turning off the high side and low side MOSFETs. The MOSFETs remain off during the remainder of the charge cycle and subse- quent discharge cycle of the SS capacitor. Again, provided there are no external fault conditions, the FAULT latch will be reset when the SS voltage reaches 250 mV. Over Current Protection The SP6120 over current protection scheme is designed to take advantage of three popular detection schemes: Sense Resistor, Trace Resis- tor or Inductor Sense. Because the detection threshold is only 43mV, both trace resistor and inductor sense become attractive protection schemes. The inductor sense scheme adds no additional dc loss to the converter and is an excellent alternative to Rdson based schemes; providing continuous current sensing and flex- ible MOSFET selection. An internal, 10 µs filter conditions the over current signal from tran- sients generated during load steps. In addition, because the over current inputs, ISP and ISN, are capable of rail to rail operation, the SP6120 provides excellent over current protection dur- ing conditions where V IN approaches VOUT. THEORY OF OPERATIONS: Continued |
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