MC33364D2G Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

MC33364D2G

Critical Conduction GreenLine SMPS Controller

ON Semiconductor 

Startup circuit is

charging the VCC

capacitor

15V

MC33364

Startup circuit turns

off when VCC is 15V

Supply Voltage, VCC

8.1V

5V

0V

Vref regulator turns on

when VCC reaches 15V

Maximum drain current is

limited to 1.15V / Rsense

VT (3.5 to 6V)

Startup circuit turns

on when VCC reaches

the threshold VT

Vref regulator turns

off when VCC falls

below 8.1 V

Vref falls faster than VCC

since Vref capacitor is much

smaller than VCC capacitor

0A

Switching starts when

Vref reaches 5V

Switching stops when

Vref falls below 3.7V

Figure 3. Timing Diagram in Fault Condition

Reference Voltage, Vref

Drain Current

Output

Current

Drain

Current

Criticial Mode

Discontinous Conduction Mode

No load

Maximum drain current is limited to 1.15V/ Rsense

LEB

Secondary

Side Diode

Current

toff(min)

Vin

Drain

Voltage

10V

Voltage

at ZCD

0.7V

ZCD is ignored during minimum off−time limit

Figure 4. Timing Diagram in Normal Condition

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