RN5RY202A-TL Ver la hoja de datos (PDF) - RICOH Co.,Ltd.

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RN5RY202A-TL

VFM STEP-UP DC/DC CONVERTER CONTROLLER

RICOH Co.,Ltd. 

RN5RY202

NOTES ON EXTERNAL COMPONENTS

• If input voltage is high enough, higher efficiency may be obtained by using MOSFET in the driver transistor, in

which case no resistors and condensers are necessary.

• Always keep the absolute maximum ratings (VDS and VCE) since spike voltage higher than output voltage may be

applied to the driver transistor. We recommend that you use transistors with absolute maximum ratings more than

twice of the output setting voltage.

• Use capacitor with an allowable voltage which is at least one and a half times as much as the setting output voltage.

• Use output voltage setting resistors with resistance much smaller than IC internal resistor (MIN. 2MΩ). Be care-

ful not to allow larger resistance, which will result in larger error in setting voltage. We recommend resistors up to

several tens of kΩ.

• Select an inductor with small DC resistance and enough permissible current and less tendency to magnetic satura-

tion.

• Select a diode of a shot-key type with a faster switching speed. Also pay attention to current capacity.

(Reference external components)

• Inductor

CD54, CD73, CD104 (Sumida)

• Driver transistor

2SD1628 (Sanyo)

2SK1470 (Sanyo)

2SK1959 (NEC)

2SK2054 (NEC)

• Diode

RB111C (Rohm)

D1FS4A (Shindengen)

• Output condenser

Tantalum type

8

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