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RP105L071E-TR Datasheet(PDF) 11 Page - RICOH electronics devices division |
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RP105L071E-TR Datasheet(HTML) 11 Page - RICOH electronics devices division |
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11 / 38 page  NO.EA-179-160420 11 * RP105Q (SC-88A) is the discontinued product as of June, 2016. TECHNICAL NOTES UVLO (Undervoltage Lockout) In RP105xxxxB/D, UVLO detects and turns off the output when the input voltage VIN drops lower than or equal to VSET + 50 mV (Typ) while CE = “H”. Since RP105xxxxE/F does not have UVLO, it continues to output even if VIN drops to VSET + 50 mV (Typ) or lower. When VIN drops below the set output voltage VSET, UVLO does not turn off the output in RP105xxxxE/F while CE = “H”, therefore the current flows from VBIAS pin to VIN pin via the inside IC. This will not be generated in RP105xxxxB/D since UVLO turns off the output when VIN is lower than or equal to VSET + 50 mV (Typ). Phase Compensation In this device, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, use a capacitor for COUT with the capacity of equal or more than 2.2 µF. If tantalum capacitors are connected as COUT, and if the equivalent series resistance (ESR) value is large, the operation might be unstable. Because of this, test the device with as same external components as ones to be used on the PCB. PCB Layout Make VBIAS, VIN, and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect a capacitor with a capacitance value as much as 1.0 µF or more between VBIAS pin and GND, between VIN pin and GND, and as close as possible to the pins. Set external components, especially the output capacitor, as close as possible to the device, and make wiring as short as possible. VIN source is supposed to be the output of the DC/DC converter. The value should be equal or lower than VBIAS voltage. |
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