MB39C014 查看數據表（PDF） - Cypress Semiconductor

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MB39C014

1 ch DC/DC Converter IC with PFM/PWM Synchronous Rectification

Cypress Semiconductor 

MB39C014

4.1 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

Voltage mode type model

VIN

Vc

VTRI

Vc

VTRI

ton

Vc

VIDET

Current mode type model

VIN

Oscillator

S

Q

R

SR-FF

VIDET

Vc

toff

toff

ton

Note :

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

Document Number: 002-08361 Rev. *C

Page 6 of 32

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