M62281P Просмотр технического описания (PDF) - Renesas Electronics

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M62281P

General Purpose Current Mode PWM Control IC

Renesas Electronics 

M62281P/FP

CLM OUT

RNF1

CNF

RNF2

RCS

Figure 7-2 Peripheral Circuit of CLM When The Detected Voltage is High

1000 pF to 22000 pF is recommended for CNF. Be sure to use 100 Ω 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)

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

Figure 8 Peripheral Circuit of CURRENT SENSE

RCS is determined by :

VCS = (VEA OUT − 1.3) / 3 (V), where VEA OUT represents the voltage of EA OUT terminal.

CF Terminal

Oscillation frequency is set by capacitor connected to CF terminal.

The waveform of CF terminal is triangular one with the ratio of 9 : 1 for charge-discharge period.

Oscillation frequency is represented as :

fOSC =

1

(19.4 × 103 × COSC) + (0.4 × 10−6)

(Hz)

REJ03D0840-0201 Rev.2.01 Nov 14, 2007

Page 9 of 12

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