R1155N025C-TR-FE datasheet(10/26 Pages) RICOH

Part #	R1155N025C-TR-FE

Description	150 mA 24 V Input High Voltage Regulator

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Manufacturer	RICOH [RICOH electronics devices division]

Direct Link	http://www.ricoh.com

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10 / 26 page

R1155x

NO.EA-270-150702

10

APPLICATION INFORMATION

VOUT

VIN

VDD

GND

CE

CIN

COUT

R1155xxxxB

V IN

V OUT

VDD

GND

V FB

CE

CIN

R115 5x00 1C

COUT

V OUT

R1

R2

R1155xxxxB Typical Application

(Fixed Output Voltage Type)

R1155x001C Typical Application

(Adjustable Output Voltage Type)

Technical Notes on the Components Selection

 In the R1155x, phase compensation is provided to secure stable operation even when the load current is

varied. For this purpose, use a 4.7 μF or more output capacitor (COUT) with good frequency

characteristics and proper ESR (Equivalent Series Resistance). In case of using a tantalum type

capacitor and the ESR value of the capacitor is large, the output might be unstable. Evaluate the circuit

including consideration of frequency characteristics.

 Ensure the VDD and GND lines are sufficiently robust. If their impedance is too high, noise pickup or

unstable operation may result. Connect COUT with suitable values between the VOUT and GND pins, and

as close as possible to the pins. Please refer to Figure 5 and Figure 6 below.

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R1155N025C-TR-FE Datasheet(PDF) 10 Page - RICOH electronics devices division

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