HA16163T_08 RENESAS [Renesas Technology Corp], HA16163T_08 Datasheet - Page 21

• Manufacturer Part Number: HA16163T_08
• Description: Synchronous Phase Shift Full-Bridge Control IC
• Manufacturer: RENESAS [Renesas Technology Corp]

HA16163T
• Case 2
• 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.
REJ03F0001-0600 Rev.6.00 Jul 01, 2008
Page 21 of 29
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.
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.
Cref
Cref
Vref
Vref
5V ± 2%
Circuitry
Circuitry
Internal
Internal
HA16163
HA16163
Vext
Blocking diode
Figure 13
Case 2
Case 3
HA16163T
Vcc
VCC
OUT-E
OUT-E
VREF
CB
CB