Ricoh manuals, page 2
Ricoh PJ WX4152NI Projector User Manual
User Manual 188 pages · 6.1 MB · ZHThe Ricoh PJ WX4152NI projector user manual provides setup, operation, network, interactive features, and maintenance instructions.
Ricoh SP 1200SU/SP 1200S Printer User Manual
User Manual 99 pages · 5.3 MB · ZHThe Ricoh SP 1200SU and SP 1200S printer user manual explains setup, paper handling, copying, scanning, maintenance and troubleshooting.
Ricoh IM C6500/C8000 User Manual
User Manual 174 pages · 3.8 MB · ENThe Ricoh IM C6500/C8000 user manual explains how to use Web Image Monitor, configure administrator settings, and secure network communication.
RICOH R1290x SERIES handbook
The R1290 series are optimized DC/DC converter ICs for TFT LCD displays. Each of the R1290 series contains one PWM step-up DC/DC converter controller and two diode charge-pump controllers. The charge-pumps can control a boost output and a negative output and have the output voltage regulation function with external resistors. The power on sequence can be made with setting the delay time with external capacitors for each charge pump channel.
RICOH R1232D SERIES handbook(1)
The R1232D series is a CMOS-based PWM step-down DC/DC converter with synchronous rectifier and low supply current. A 10μF or greater ceramic capacitor can be used as the output capacitor with the R1232D. Each of these ICs consists of an oscillator, a PWM control circuit, a voltage reference unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), a chip enable circuit, a synchronous rectifier, Nch. driver transistor, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. (As for R1232D001x type, divider resistors are also necessary.) In terms of the output voltage, it is fixed internally in the R1232Dxx1x types. While in the R1232D001x types, the output voltage is adjustable with external divider resistors. As protection circuits, current limit circuit which limits peak current of LX at each clock cycle, and latch type protection circuit exist. The latch protection works if the term of the over-current condition keeps on a certain time. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at U1 less than 3V.
RICOH R1232D SERIES datasheet(1)
The R1232D Series are low supply current CMOS-based PWM step-down DC/DC converters with synchronous rectifier. R1232D includes a soft start circuit, under-voltage lockout circuit (UVLO) and latch type protection circuit. By simply using an inductor, a capacitor, and (resistors) as external components, a high-efficiency step-down DC/DC converter can be easily configured. R1232D comes in two types: R1232Dxx1A/B with internally fixed output voltage and R1232D001C/D with adjustable output voltage with external resistors.
RICOH RP504x SERIES handbook(1)
RICOH RP504x SERIES datasheet(1)
RP504x series is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous rectifier. RP504K/L can be switched from two control types by inputting signal to the MODE pin - forced PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. (RP504N Series can be selected from forced PWM control or PWM/VFM auto switching control.) RP504x includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2μH) and output capacitor (4.7μH) can be used by the switching of 2.25MHz. In addition to SOT-23-5 and DFN1616-6B packages, a 1.2mm × 1.6mm DFN(PLP)1216-6B package is also available.
RICOH RP503x SERIES handbook(1)
The RP503x Series are low supply current CMOS-based 600mA∗ step-down DC/DC Converters with synchronous rectifier. Each of these ICs consists of an oscillator, a switching control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, UVLO circuit, a latch protection circuit, switching transistors, and so on. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 0.1V step output can be set by laser-trim and 1.5% or 18mV tolerance depending on the output voltage is guaranteed. RP503x is PWM/VFM auto switching control in which mode automatically switches from PWM mode to high-efficiency VFM mode in low output current. The efficiency in low output current (VFM mode) improved compared with existing products. As protection circuits, the current limit circuit which limits peak current of Lx at each clock cycle, and the latch type protection circuit which works if the term of the over-current condition keeps on a certain time exist. The latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of the protection, after disabling this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the sup
RICOH RP503x SERIES datasheet(1)
The RP503x series is a low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP503x is PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. The efficiency in low output current (VFM mode) improved compared with existing products. RP503x includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured.
RICOH RP502x SERIES handbook(1)
The RP502x series of synchronous rectifier step-down DC/DC converters are based on the CMOS process. They contain an oscillator, a reference voltage unit, an error amplifier, a switching control circuit, a soft-start circuit, protection circuits, an UVLO circuit, and switching transistors. Using built-in switch transistors for synchronous rectification, a high-efficiency step-down DC/DC converter is composed of only an inductor and capacitors. As protection circuits, the ICs contain a current limit circuit and a latch protection circuit. The current limit circuit controls the peak current of LX at each clock cycle. If the load current exceeds the limit value for a certain period of time, the latch protection circuit maintains the built-in driver in OFF state. To cancel the latch protection, disable the ICs with a chip enable circuit and then enable it again, or make the power supply voltage lower than UVLO. The setting voltage for the RP502x series is the output voltage fixed type with built-in feedback resistance that is adjustable in 0.1V step with the accuracy of ± 1.5% or ±24mV. The packages for the ICs are WLCSP-6-P2 and DFN1616-6, which enable the high-density mounting. The switching mode for the ICs is selectable from the PWM/VFM auto switching type, which achieves the high efficiency at the light load condition or PWM fixed type, which switches at the fixed frequency.
RICOH RP502x SERIES handbook
The RP502x Series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP502x can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP502x includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (1.0μH/2.2μH) and small output capacitor (4.7μF) can be used by the switching of 3.3MHz.
RICOH RP501K SERIES handbook(1)
RP501K series are CMOS-based step-down DC/DC converters with synchronous rectifier.
RICOH RP501K SERIES datasheet(1)
The RP501K series are low supply current CMOS-based PWM/VFM step-down DC/DC converters with synchronous rectifier. RP501K can be selected from two control types by input signal to the MODE pin - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP501K includes a soft start circuit, an under-voltage lockout circuit (UVLO), and a latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The small inductor (2.2μH) can be used by the switching of 2.25MHz. The frequency accuracy improved to ±10%.
RICOH RP500x SERIES handbook(1)
RP500x Series 600mA* Step-down DC/DC Converter with Synchronous Rectifier