MB39C015 datasheet(7/43 Pages) CYPRESS

7 / 43 page

MB39C015

Document Number: 002-08364 Rev. *A

Page 7 of 43

■ Current mode

❐ Original voltage mode type :

Stabilize the output voltage by comparing two items below and on-duty control.

• Voltage (VC) obtained through negative feedback of the output voltage by Error Amp

• Reference triangular wave (VTRI)

❐ Current mode type :

Instead of the triangular wave (VTRI), the voltage (VIDET) obtained through I-V conversion of the sum of currents that flow in the

oscillator (rectangular wave generation circuit) and SW FET is used.

Stabilize the output voltage by comparing two items below and on-duty control.

• Voltage (VC) obtained through negative feedback of the output voltage by Error Amp

• Voltage (VIDET) obtained through I-V conversion of the sum of current that flow in the oscillator (rectangular wave generation

circuit) and SW FET

VIN

ton

toff

VTRI

VIN

toff

VIDET

ton

SR-FF

VIDET

−

Voltage mode type model

Current mode type model

Oscillator

Note : The above models illustrate the general operation and an actual operation will be preferred in the IC.

MB39C015 Datasheet(PDF) 7 Page - Cypress Semiconductor