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XC9510 Datasheet(PDF) 14 Page - Torex Semiconductor

No. de Pieza. XC9510
Descripción  Synchronous Step-Down DC/DC Converter With Built-In LDO Regulator Plus Voltage Detector
Descarga  36 Pages
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Fabricante  TOREX [Torex Semiconductor]
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XC9510 Datasheet(HTML) 14 Page - Torex Semiconductor

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XC9510 Series
Application Information (Continued)
5. The IC's DC/DC converter operates in synchronous mode when the coil current is in a continuous state and
non-synchronous mode when the coil current is in a discontinuous state. In order to maintain the load current
value when synchronous switches to non-synchronous and vise versa, a ripple voltage may increase because of the
repetition of switching between synchronous and non-synchronous. When this state continues, the increase in the
ripple voltage stops. To reduce the ripple voltage, please increase the load capacitance value or use a schottky
diode externally. When the current used becomes close to the value of the load current when synchronous
switches to non- synchronous and vise versa, the switching current value can be changed by changing the coil
inductance value. In case changes to coil inductance are to values other than the recommended coil inductance
values, verification with actual components should be done.
Ics =
(VIN - DCOUT) x OnDuty / (L x Fosc)
Ics: Switching current from synchronous rectification to non-synchronous rectification
OnDuty: OnDuty ratio of P-ch driver transistor (
.=.step down ratio : DCOUT / VIN)
L: Coil inductance value
Fosc: Oscillation frequency
IDOUT: The DC/DC load
(the sum of the DC/DC's and the regulator's load if the regulator has load.)
6. When the XC9510H to L series operates in PWM/PFM automatic switching control mode, the reverse current may
become quite high around the load current value when synchronous switches to non-synchronous and vise versa
(also refer to no. 5 above).
Under this condition, switching synchronous rectification and non-synchronous
rectification may be repeated because of the reverse current, and the ripple voltage may be increased to 100mV or
more. The reverse current is the current that flows in the PGND direction through the N-ch driver transistor from the
coil. The conditions which cause this operation are as follows.
PFM Duty < Step down ratio = DCOUT / VIN x 100 (%)
PFM Duty: 30% (TYP.)
Please switch to PWM control via the MODE function in cases where the load current value of the DC/DC converter
is close to synchronous.
NOTES ON USE (Continued)
DC/DC Waveform (1.8V, 600kHz) @ VIN=6.0V
< External Components>
Step down ratio : 1.8V / 6.0V = 30%<PFM Duty 31%>

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