16114FP Renesas, 16114FP Datasheet - Page 9

• Manufacturer Part Number: 16114FP
• Description: Search -----> HA16114FP
• Manufacturer: Renesas

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The oscillator frequency f
At high frequencies the comparator delay causes the sawtooth wave to overshoot the 1.6 V threshold and
undershoot the 1.0 V threshold, and changes the dead-band thresholds accordingly. Select constants by
testing under implementation conditions.
Here,
Since
R
I
O
T
1.1 V
f
t
t 2 =
t 3 ≈ 0.8 µs (comparator delay time)
V
f
1
OSC
OSC
Current
mirror
H
=
− V
=
≈
C
C
L
0.73 × C
3 × 1.1 V/R
T
= 0.6 V
T
External circuit
t
OSC
1
1.1 V/R
× (V
× (V
+ t
can be calculated as follows.
1
2
H
H
Figure 1.1 Equivalent Circuit of Oscillator
+ t
− V
− V
T
T
3
× R
1 : 4
T
L
L
1
)
)
T
+ 0.8 (µs)
(Internal voltage)
Discharg
-ing 3I
C
t
t
1
2
V
T
H
I
HA16114P/PJ/FP/FPJ, HA16120FP/FPJ
charging
O
O
C
= 1.6 V typ
T
(Hz)
3.2 V
Oscillator
comparator
V
L
= 1.0 V typ
Rev.1, Dec. 2000, page 7 of 38
t
R
1
C
: t
2
= 3 : 1
R
R
A
B
2.5 V
Vref
SYNC
circuit
Sync
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