HA16163T Datasheet, PDF (21/30 Pages) Renesas Technology Corp – Synchronous Phase Shift Full-Bridge Control IC

HA16163T
• Case 2
The figure below shows an example in which a current amplifier is added by means of transistors. A reverse
current due to the exciting current is prevented by a blocking diode, and therefore capacitance CB is charged. In
this way, fluctuation of the Cref potential is suppressed and stable operation can be achieved.
As well as a buffer implemented by means of a transistor, standard logic IC or buffer IC connection is also possible.
The buffer circuit power supply method should be implemented in the same way.
Blocking diode
HA16163
CB
Vref
Cref
Internal
Circuitry
OUT-E
Case 2
• Case 3
The figure below shows an example of a drive power supply method using emitter following. For the same reason
as described above, fluctuation of the Cref potential is suppressed and stable operation can be achieved.
VCC
HA16163
Vref
Cref
Internal
Circuitry
CB
OUT-E
Case 3
Supplying Power from an External Power Supply
It is also possible to use an external source as the power supply for the HA16163T as shown in figure 13. The
VREFGOOD circuit controls whether the IC is operating or stopped. The threshold voltage of the VREFGOOD circuit
is 4.6 V (typ.) on the rising edge and 4.4 V on the falling edge. Since the IC’s characteristics vary with the value of the
external voltage, this voltage must be provided by a high-precision 5-V source.
Vext
5V ± 2%
Vcc
VREF
HA16163T
Figure 13
Rev.5.0, Mar.15.2004, page 21 of 29