HA16150T Datasheet, PDF (17/25 Pages) Renesas Technology Corp – High-Speed Current Mode Push-Pull PWM Control IC

HA16150T/P
7. VREF Circuit
(1) For the VREF pin, make sure to connect stabilizing capacitance to GND.
(2) When the value of stabilizing capacitance is small or the load of VREF pin is heavy, either OUT1 or OUT2 may be
halted at high level if the IC is stopped by a remote off function. In such a case, increase the capacitance value. The
minimum value of capacitance to be connected is approximated by the following equation.
Cref > ^{10µs × (Iref + 6mA)}
4.95V
(3) Depending on the value of capacitance to be connected, overshoot may result at the rising of the VREF pin (see the
figure below). Take extra care when the VREF pin voltage is used as the power supply and reference voltage of
external circuit.
1.0
0.8
0.6
0.4
0.2
0
1E–9
10E–9
100E–9
1E–6
Vref pin capacitance (F)
10E–6
Figure 9 Overshoot Voltage of Vref Pin (Reference Data)
8. CS Pin
RC filter is generally inserted into the CS pin to prevent the pin from malfunction due to noise. The CS pin has an
internal circuit to pull out electric charge while both of the OUT1 and OUT2 are at the low level (dead band time).
However, please be aware that the electric charge may not be pulled out when the duration of dead band time is short
and the filter constant is not appropriate.
Rev.3.00 Jan 30, 2007 page 17 of 24