ha16163t Renesas Electronics Corporation., ha16163t Datasheet - Page 19

• Manufacturer Part Number: ha16163t
• Description: Synchronous Phase Shift Full-bridge Control Ic
• Manufacturer: Renesas Electronics Corporation.

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.
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.
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
Light load
Pulse by pulse OCL
One shot OCL
Notes: 1. Light-load detection is performed by means of the error amplifier output voltage. Light-load detection
Rev.5.0, Mar.15.2004, page 19 of 29
2. TD3 of the next OUT-E or OUT-F after the pulse-by-pulse current limiter (PBP OCL) operates is 0 s (typical).
TD = 0.5p[F]
COMP
characteristics are as shown in the following diagram.
RAMP
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.
FB
Error Amp.
1.25V
1.00E+03
1.00E+02
1.00E+01
1.00E+00
RD[ ] + 8n[s]
−
+
VREF
500
Definition
COMP < 1.65V
CS ≥ 0.4V
CS ≥ 0.6V
20k
1
10k
Light Load
Detector
[s]
0.4V
−
+
−
+
10
Comparator
TD vs. RD
RD (k )
Operation of OUT-E, OUT-F
TD3 = 0
TD3 = 0
Fixed low (operation halted)
Figure 11
100
TD3
set value
Light Load Detector Characteristics
1000
TD3
0
1.46V 1.55V
RD
(2.0V)
voltage
COMP
DELAY-1
(DELAY-2)
(DELAY-3)
HA16163
GND
Note
1
2