MB39C015 Datasheet, PDF (7/43 Pages) Cypress Semiconductor – High efficiency : 96% (Max)

MB39C015
■ 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
Current mode type model
VIN
Oscillator
Vc
+
VIDET
−
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: 002-08364 Rev. *A
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