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SP7662 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP7662 Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 19 page  8 Mar -07 Rev AJ SP7662 Wide Input Voltage Range 2A, 300kHz Buck Regulator © 2007 Sipex Corporation SolvingforR9weget: R9 = [60mV • (R3 + R4)] [(IMAx • DCR) – 60mV] Asanexample:ifdesiredIMAx is 7A, then R9 = 63.4KΩ. R9 63.4KΩ CSP 6.8nF SWN ISP ISN SP7662 CS 0.uF R4 5.11KΩ R3 5.11KΩ L=2.7uH,DCR=4.1mΩ VOUT Over-current detection circuit for Imax > 60mV / DCR Decreasing the Current Limit If it is required to set IMAx < {60mV / DCR, a resistor is added as shown in the follow- ing figure. R8increases the net voltage detected by the current-sense comparator. Voltage at the positive and negative terminal ofcomparatorisgivenby: VSP = VOut + (IMAx • DCR) VSN = VOut • {R8 / (R4 +R8)} Sincethecomparatoristriggeredat60mV: VSP-VSN = 60 mV Combining the above equations and solv- ingforR8: R8 = R4 • [VOut- 60mV + (IMAX • DCR)] 60mV - (IMAX • DCR) Asanexample:forIMAx of 2A and VOut of 3.3V,calculatedR8is1.5MΩ. CSP 6.8nF ISN SP7662 SWN ISP CS 0.uF R4 5.11KΩ R3 5.11KΩ VOUT L=2.7uH,DCR=4.1mΩ R8 1.5MΩ Over-current detection circuit for Imax < {60mV / DCR} Handling of Faults Upon the detection of power (UVLO), ther- mal, or short-circuit faults, the SP7662 is forced into an idle state where the SS and COMPpinsarepulledlowandbothswitches are held off. In the event of UVLO fault, the SP7662 remains in this idle state until the UVLO fault is removed. Upon the detection of a thermal or short-circuit fault, an internal 200ms timer is activated. In the event of a short-circuit fault, a restart is attempted im- mediately after the 200ms timeout expires. Whereas, when a thermal fault is detected the200msdelaycontinuouslyrecyclesanda restartcannotbeattempteduntilthethermal fault is removed and the timer expires. THEORY OF OPERATION |
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