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M62212FP

GENERAL PURPOSE DC-DC CONVERTER

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTORS <Standard Linear ICs>

M62212P/FP/GP

GENERAL PURPOSE DC-DC CONVERTER

2. FUNCTION DESCRIPION

1) Soft Start (The peripheral circuit is shown in Fig.1)

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

terminal is fixed to High level. The DTC terminal goes up gradually starting from 0V

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 45µA.

FB

OSC

DTC

1.0V

0.45V

OFF

External Tr collector

ON

Fig.2

2) DTC

The dead time control is set by installing a resistor between the DTC terminal and GND.

However, the DTC terminal serves as the short protection circuit also. Therefore, its set up

depends on whether the short protection circuit is used and not.

(When the short protection circuit is used)

At this time, the charge current for DTC is approximately 10µA . Therefore, RDTC should

be set to 40KΩ ~ 110KΩ.

(When the short protection circuit is not used)

At this time, the charge current for DTC is approximately 45µA. Therefore, RDTC is set to

12KΩÅ`25KΩ.

( 5/ 8 )

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