HA16163T Datasheet, PDF (20/30 Pages) Renesas Technology Corp – Synchronous Phase Shift Full-Bridge Control IC

HA16163T
Application
Note: All voltage, current, time shown in the diagram are typical value.
Sample application circuits are given here. Confirmatory experiments should be carried out when applying these
examples to products.
Slope Compensation
In order to improve the unstable operation characteristic of current mode, voltage slopes in a current sense signal can be
superimposed. The following is a possible slope compensation method.
5V(VREF)
OUT-A
OUT-D
Current sense signal
OUT-B
OUT-C
Compensated signal RAMP
HA16163
Comparator
−
+
0.4V
S
Q
R
RES
Figure 12
Driving a Pulse Transformer
OUT-A through OUT-F of this IC are CMOS outputs that use Vref as their power supply. When directly driving a
pulse transformer, the Vref voltage fluctuates according to the exciting current. As Vref fluctuation may make internal
circuit operation unstable, direct drive of a pulse transformer should be avoided.
• Case 1 (NG)
The figure below shows a case where a pulse transformer is driven directly. Vref voltage fluctuation occurs due to
the exciting current.
HA16163
Vref value fluctuates due to
this exiting current
Vref
Cref
Internal
Circuitry
OUT-E
Case 1 (NG)
Rev.5.0, Mar.15.2004, page 20 of 29