M62212P Ver la hoja de datos (PDF) - Renesas Electronics

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M62212P

General Purpose DC/DC Converter

Renesas Electronics 

M62212P/FP/GP

Application Circuit

VIN

+

CIN

8

L

D

1

4

COSC

7

M62212P/FP/GP

2

6

5

3

+

+

VOUT

R1

COUT

R2

Figure 1 STEP-DOWN Converter with Current Buffer Transistor

Function Description

1) Soft start (The peripheral circuit is shown in Figure 1)

When the power is turned ON, input terminal IN is at 0 V level. Therefore, the FB terminal is fixed to High level.

The DTC terminal goes up gradually starting from 0 V due to the internal charge current and the external CDTC.

When the level of DTC terminal reaches the lower limit of the triangular wave of the oscillator, PWM comparator

and the output circuit go into operation causing the output voltage, "VO" of the DC/DC converter to rise. The charge

current is designed to be approximately 45 µA.

FB

DTC

OSC

1.0 V

0.45 V

OFF

External Tr collector

ON

Figure 2

Rev.2.00 Jun 14, 2006 page 4 of 8

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