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M62213P

GENERAL PURPOSE HIGH SPEED PWM CONTROL IC

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTOR < STANDARD LINEAR IC >

M62213P/FP

GENERAL PURPOSE HIGH SPEED PWM CONTROL IC

Even if the timer function is not needed, latch function operates, that is, IC becomes inoperative when

the voltage of CT terminal is forced to be high voltage. Therefore, CT terminal can also be used for

OVP(over voltage protection).

When only OVP function is needed(timer latch function is not necessary), connect the resistor between

CT terminal and GND. In this case, the above mentioned charge current cannot make the voltage of CT

terminal rise up to "H" threshold, thus latch function does not operate. (Refer to Fig.5-1, 5-2)

Vcc

OVP function operates

when photo-coupler is ON.

CT

Vcc

OVP function operates

when photo-coupler is ON.

CT

Fig.5-1 Method to use timer type latch and OVP

Fig.5-2 Method to use only OVP

(3) SOFT(DUTY SET-UP) TERMINAL

The voltage of SOFT terminal determines the maximum duty.

Maximum duty can be set by connecting the resistor as in Fig.6

because the constant current compensated for temperature flows

out of this terminal.

And by connecting the capacitor between the terminal and GND,

soft start function operates. That is, we can get the gradual

increase of maximum duty at start-up.

Maximum duty is represented as:

CSOFT

SOFT

VSOFT

Duty(max.) ≈ (40.5 * VSOFT) - 58 (%)

,where VSOFT=ISOFT * RSOFT (V), ISOFT ≈ 50µA(typ.)

Fig.6

Method to set up duty

and SOFT start function.

If the voltage of SOFT terminal is higher than 3.53V(typ.)(upper limit

voltage of the oscillation waveform), maximum duty is internally decided

to be 90%.

Soft start time (TSOFT) is represented as:

TSOFT ≈ CSOFT * 31 * 103 (sec)

TSOFT means the time from start-up until the voltage of SOFT terminal

goes up to higher than 1.4V(typ.) (lower limit voltage of the oscillation

waveform).

Discharging circuit operative before start-up at Vcc is internally equipped

so that the soft start never fail to operate at the restart of voltage supply.

(6/9)

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