Data Sheet G14309EJ2V0DS00

12

µµµµPC1909

Signal Name

Function

Signal Name

Function

OUT1

Output for main switch

OUT2

Output for subswitch

DTC1

Voltage for setting maximum duty limit of OUT1

DTC2

Voltage for setting maximum duty limit of OUT2

FB

Feedback voltage of converter output

CT

Triangle wave generated by oscillator

dCT

Triangle wave that is CT level-shifted via the

level shift circuit (OLS)

Remarks 1. The oscillation frequency of CT is determined by the external capacitor connected to the CT pin and the

external resistor connected to the RT pin (refer to 3.3 Overcurrent Limitation Operation). CT is a

symmetrical triangle wave with a trough voltage (low-level threshold voltage VTH(L)) of 1.5 V and a crest

voltage (high-level threshold voltage VTH(H)) of 3.5 V. Note that the dCT voltage cannot be viewed

externally.

2. In the T1 and T2 periods in Figure 3-1, the FB voltage level rises as the converter output voltage is boosted,

with the result that the converter voltage cannot be controlled by FB.