Datasheet > RP504K121A5-E2

RP504K121A5-E2

更新时间： 2024-11-14 08:05:51

品牌	Logo	应用领域
理光 - RICOH		/
页数	文件大小	规格书
39页	794K
描述
Switching Controller

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RP504K121A5-E2 数据手册

RP504x Series

600 mA PWM/VFM Step-Down DC/DC Converter with Synchronous Rectifier

NO.EA-259-150130

OUTLINE

The RP504x is a low supply current CMOS-based PWM/VFM step-down DC/DC converter with synchronous

rectifier featuring 600 mA^*1output current. Internally, a single converter consists of an oscillator, a reference

voltage unit, an error amplifier, a switching control circuit, a mode control circuit (RP504xxx1A/D), a soft-start

circuit, a Latch-type protection circuit, an under voltage lockout (UVLO) circuit a.nd switching transistors.

The RP504x is employing synchronous rectification for improving the efficiency of rectification by replacing

diodes with built-in switching transistors. Using synchronous rectification not only increases circuit performance

but also allows a design to reduce parts count.

Power controlling method can be selected from forced PWM control type or PWM/VFM auto switching control

type by inputting a signal to the MODE pin. In low output current, forced PWM control switches at fixed frequency

rate in order to reduce noise. Likewise, in low output current, PWM/VFM auto switching control automatically

switches from PWM mode to VFM mode in order to achieve high efficiency.

Output voltage is internally fixed type which allows output voltages that range from 0.8 V to 3.3 V in 0.1 V step.

The output voltage accuracy is as high as ±1.5% or ±18 mV.

Protection circuits included in the RP504x are overcurrent protection circuit and latch type protection circuit.

Overcurrent protection circuit supervises the inductor peak current in each switching cycle, and if the current

exceeds the L_Xcurrent limit (I_LXLIM), it turns off P-channel Tr. Latch type protection circuit latches the built-in driver

to the OFF state and stops the operation of the step-down DC/DC converter if the overcurrent status continues or

V_OUTcontinues being the half of the setting voltage for equal or longer than protection delay time (tprot). To cancel

the latch type protection circuit, select the standby mode or the active mode with the CE pin, or drop the power

supply voltage below the UVLO detector threshold.

The RP504x is offered in 6-pin DFN(PLP)1216-6F, 6-pin DFN1616-6B and 5-pin SOT-23-5 packages which

achieve the smallest possible footprint solution on boards where area is limited.

^*1This is an approximate value. The output current is dependent on conditions and external components.

12 3 4 5 6 7...39

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与RP504K121A5-E2相关器件

型号	品牌	获取价格	描述	数据表
RP504K121AD-TR	RICOH	获取价格	DC-DC Regulated Power Supply Module, 1 Output, Hybrid, HALOGEN FREE AND ROHS COMPLIANT, DF
RP504K121A-E2	RICOH	获取价格	Switching Controller, Voltage-mode, 0.9A, 2550kHz Switching Freq-Max, CMOS, PDSO6, 1.20 X
RP504K121D2-E2	RICOH	获取价格	Switching Controller
RP504K121D-E2	RICOH	获取价格	Switching Controller, Voltage-mode, 0.9A, 2550kHz Switching Freq-Max, CMOS, PDSO6, 1.20 X
RP504K121D-TR	RICOH	获取价格	Switching Controller
RP504K131A-E2	RICOH	获取价格	Switching Controller, Voltage-mode, 0.9A, 2550kHz Switching Freq-Max, CMOS, PDSO6, 1.20 X
RP504K131D-E2	RICOH	获取价格	Switching Controller, Voltage-mode, 0.9A, 2550kHz Switching Freq-Max, CMOS, PDSO6, 1.20 X
RP504K131D-TR	RICOH	获取价格	Switching Controller
RP504K141AD-TR	RICOH	获取价格	DC-DC Regulated Power Supply Module, 1 Output, Hybrid, HALOGEN FREE AND ROHS COMPLIANT, DF
RP504K151AD-TR	RICOH	获取价格	DC-DC Regulated Power Supply Module, 1 Output, Hybrid, HALOGEN FREE AND ROHS COMPLIANT, DF

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