MB39C007 Datasheet, PDF (6/52 Pages) Fujitsu Component Limited. – 2 ch DC/DC Converter IC Built-in Switching FET & voltage detection function, PFM/PWM Synchronous Rectification, and Down Conversion Support

MB39C007
• 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.
6
DS04-27246-2E