M62281P Просмотр технического описания (PDF) - MITSUBISHI ELECTRIC

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M62281P

GENERAL PURPOSE CURRENT MODE PWM CONTROL IC GENERAL PURPOSE CURRENT MODE PWM CONTROL IC

MITSUBISHI ELECTRIC  

MITSUBISHI SEMICONDUCTOR < STANDERD LINEAR IC >

M62281P/FP

GENERAL PURPOSE CURRENT MODE PWM CONTROL IC

(4) CLM TERMINAL

This terminal is for pulse-by-pulse current limiting.

Current limiting circuit is almost the same as that of M51995.

CLM terminal is separate from CURRENT SENSE terminal allowing the noise filter to be optimized

and the high-speed over current protection.

The voltage detected by the current detecting resistor can be directly input as shown in Fig.7-1, if the

detected voltage is about the threshold voltage(200mV(typ.)), but if the voltage is larger than the

threshold, the voltage has to be input divided by resistors as shown in Fig.7-2.

CLM OUT

RNF

CNF

RCS

CLM OUT

RNF1

CNF

RNF2 RCS

Fig.7-1 peripheral circuit of CLM

Fig. 7-2 peripheral circuit of CLM when the

detected voltage is high.

1000pF to 22000pF is recommended for CNF. Be sure to use 100Ω or less for RNF and

RNF1// RNF2 (*)so that the detection sensitivity is not influenced by the current flown out from CLM

terminal.

Non-inductive resistor is recommended for current detecting resistor.

* RNF1//RNF2 = (RNF1 * RNF2)/(RNF1 + RNF2)

(5) CURRENT SENSE TERMINAL

The voltage proportional to the switching current is supplied to this terminal.

Output duty is controlled by comparing this voltage with the output of error amp..

CLM and CURRENT SENSE terminal is separate from each other, so various settings

are available depending upon the application.

CURRENT

SENSE

OUT

RNF

CNF

RCS VCS

Fig.8 peripheral circuit of CURRENT SENSE

RCS is determined by:

VCS = (VEAOUT - 1.3)/3 (V), where VEAOUT represents the voltage of EAOUT terminal.

(7/9)

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