HA16163T Datasheet, PDF (19/30 Pages) Renesas Technology Corp – Synchronous Phase Shift Full-Bridge Control IC

HA16163T
Delay Setting
Inter-output delays (TD1, TD2, TD3) are set by means of a resistance connected between the DELAY-1 (-2, -3) pin and
GND. The following graph shows the relationship between the external resistance and delay. The typical value of the
delay set time is given by the following equation.
TD = 0.5p[F] × RD[Ω] + 8n[s] [s]
When the RD value is small, the set time will be larger than the above calculated value due to the effect of internal
delay, etc., and therefore a constant setting should be made with reference to the following graph.
1.00E+03
TD vs. RD
HA16163
1.00E+02
1.00E+01
1.00E+00
1
10
100
RD (kΩ)
1000
(2.0V)
DELAY-1
(DELAY-2)
(DELAY-3)
RD
GND
Figure 11
Place the resistor for connection to the DELAY-1,2,3 pin as close to the pin as is possible. Please design the pattern so
that the level of cross-talk from other signals is minimized.
DELAY-3 (TD3)
There is a condition that secondary-side control output OUT-E and OUT-F delay TD3 is 0 s (typical) in order to
prevent shorting of the transformer secondary side. The relationship between TD3 and the IC operating state is shown
in the following table.
Mode
Definition
Operation of OUT-E, OUT-F
Note
Light load
COMP < 1.65V
TD3 = 0
1
Pulse by pulse OCL
CS ≥ 0.4V
TD3 = 0
2
One shot OCL
CS ≥ 0.6V
Fixed low (operation halted)
Notes: 1. Light-load detection is performed by means of the error amplifier output voltage. Light-load detection
characteristics are as shown in the following diagram.
VREF
Error Amp. _500µ
FB
−
+
1.25V
Light Load
Detector
−
+
TD3
TD3
set value
COMP
RAMP
20k
−
10k
+ _Comparator
0.4V
0
1.46V 1.55V COMP
voltage
Light Load Detector Characteristics
2. TD3 of the next OUT-E or OUT-F after the pulse-by-pulse current limiter (PBP OCL) operates is 0 s (typical).
When OUT-C and OUT-D are subsequently inverted by the Phase Shift Comparator, not the PBP OCL, TD3
is restored to the value set by means of the DELAY-3 pin.
Rev.5.0, Mar.15.2004, page 19 of 29