HA16150T/P

Rev.3.00 Jan 30, 2007 page 13 of 24

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 k

Ω.

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)

4.5V(Typ)

VREF is halted by REMOTE.

CH3: REMOTE

CH4: VREF

CH1: SS

CH2: OUT1

(2) When VREF is blow 4.5 V(Typ),

other functions are stopped.

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.

1.1V

V_SS

SS comp. IN+

(internal signal)

V_CT

SS comp. out

OUT1

OUT2

Figure 4