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SP7662 Datasheet(PDF) 8 Page - Sipex Corporation

No. de pieza SP7662
Descripción Electrónicos  Wide Input Voltage Range 12A, 300kHz, Buck Regulator
PDF  19 Pages
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Fabricante Electrónico  SIPEX [Sipex Corporation]
Página de inicio  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP7662 Datasheet(HTML) 8 Page - Sipex Corporation

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Nov3-06 Rev AE
SP7662 Wide Input Voltage Range 2A, 300kHz Buck Regulator
© 2006 Sipex Corporation
SolvingforRS3weget:
RS3 = [60mV • (RS1 + RS2)]
[(IMAx • DCR) – 60mV]
Asanexample:ifdesiredIMAx is 7A, then
RS3 = 63.4KΩ.
RS3
63.4KΩ
CSP
6.8nF
SWN
ISP
ISN
SP7662
CS
0.uF
RS2
5.11KΩ
RS
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. RS3 increases the net voltage
detected by the current-sense comparator.
Voltage at the positive and negative terminal
ofcomparatorisgivenby:
VSP = VOut + (IMAx • DCR)
VSN = VOut •
{RS3 / (RS2 +RS3)}
Sincethecomparatoristriggeredat60mV:
VSP-VSN = 60 mV
Combining the above equations and solv-
ing for RS3:
RS3 =
RS2 •
[VOut- 60mV + (IMAX• DCR)]
60mV - (IMAX • DCR)
Asanexample:forIMAx of 2A and VOut of
3.3V, calculated RS3is1.5MΩ.
CSP
6.8nF
ISN
SP7662
SWN
ISP
CS
0.uF
RS2
5.11KΩ
RS
5.11KΩ
VOUT
L = 2.7uH, DCR = 4.mΩ
RS3
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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