HA16150T Datasheet, PDF (13/25 Pages) Renesas Technology Corp – High-Speed Current Mode Push-Pull PWM Control IC

HA16150T/P
If the remote on/off control function is not used, the REMOTE pin should be permanently pulled down to GND with a
resistance of about 100 kΩ.
The remote on/off control function halts only reference voltage. Other functions will be stopped when the reference
voltage is below 4.5 V (typ.). Large stabilizing capacitance of the VREF pin results in a difference between the timing
of remote off signal and the timing to stop the IC
(1) VREF is halted by REMOTE.
(2) When VREF is blow 4.5 V(Typ),
other functions are stopped.
4.5V(Typ)
CH3: REMOTE
CH4: VREF
CH1: SS
CH2: OUT1
Figure 3 Operation When Remote is Off (Reference Data)
3. Soft Start Circuit
This function gradually increases the pulse width of the OUT pin from 0% duty at start-up to prevent a sudden increase
in the pulse width that may cause problems such as transient stress on external parts or overshoot of the secondary-side
output voltage.
The soft start time can easily be set with a single external capacitance.
V_CT
SS comp. IN+
(internal signal)
SS comp. out
1.1V
V_SS
OUT1
OUT2
Figure 4
Rev.3.00 Jan 30, 2007 page 13 of 24