LA5677M Просмотр технического описания (PDF) - SANYO -> Panasonic

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LA5677M

Dual Switching Regulator Control IC

SANYO -> Panasonic 

LA5677M

Figure 1 Timer-Latch Short Circuit Protection Circuit

Figure 2 Timing Resistance/Oscillator Frequency Characteristics

4. Triangle Wave Oscillator Block

The triangle wave oscillator generates an essentially symmetric triangle wave using a timing capacitor and resistor

attached to the CT pin (pin 1) and the RT pin (pin 2), respectively. The voltage amplitude is between 1.4 and 2.0 V

with pin 2 stabilized at 1 V. The oscillator frequency is determined by the external capacitor and resistor.

5. Idle Period Adjustment Circuit Block

The idle period adjustment circuit consists of PWM comparators 1 and 2, each of which has one non-inverting and

two inverting inputs. The output pulse width (on time) is controlled according to the input voltage. Pins 6 and 11 are

dead time control pins, and are used to limit the maximum value of the pulse width. A pin voltage of 2.05 V

(Typical) or over results in the output being off for the whole period, and a pin voltage of 1.45 V (Typical) or lower

results in the output being on for the whole period.

No. 3660-5/7

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