upc1909 Renesas Electronics Corporation., upc1909 Datasheet - Page 12

• Manufacturer Part Number: upc1909
• Description: Switching Regulator Control Ic
• Manufacturer: Renesas Electronics Corporation.

12
Remarks 1. The oscillation frequency of C
OUT
DTC
FB
dC
Signal Name
T
1
1
2. In the T
external resistor connected to the R
symmetrical triangle wave with a trough voltage (low-level threshold voltage V
voltage (high-level threshold voltage V
externally.
with the result that the converter voltage cannot be controlled by FB.
Output for main switch
Voltage for setting maximum duty limit of OUT
Feedback voltage of converter output
Triangle wave that is C
level shift circuit (OLS)
1
and T
2
periods in Figure 3-1, the FB voltage level rises as the converter output voltage is boosted,
Function
T
level-shifted via the
Data Sheet G14309EJ2V0DS00
T
is determined by the external capacitor connected to the C
T
pin (refer to 3.3 Overcurrent Limitation Operation). C
TH(H)
1
) of 3.5 V. Note that the dC
OUT
DTC
C
Signal Name
T
2
2
Output for subswitch
Voltage for setting maximum duty limit of OUT
Triangle wave generated by oscillator
T
Function
voltage cannot be viewed
TH(L)
) of 1.5 V and a crest
PC1909
T
pin and the
T
2
is a