TA8435HQ Toshiba, TA8435HQ Datasheet - Page 6
TA8435HQ
Manufacturer Part Number
TA8435HQ
Description
Manufacturer
Toshiba
Datasheet
1.TA8435HQ.pdf
(28 pages)
Specifications of TA8435HQ
Operating Temperature Classification
Industrial
Operating Supply Voltage (min)
4.5V
Operating Supply Voltage (typ)
5V
Operating Supply Voltage (max)
5.5V
Lead Free Status / RoHS Status
Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
TA8435HQ
Manufacturer:
TOSHIBA
Quantity:
54
Part Number:
TA8435HQ
Manufacturer:
TOSHIBA/东芝
Quantity:
20 000
OSCILLATOR FREQUENCY CALCULATION
The sawtooth oscillator (OSC) circuit consists of Q
less than the voltage of 2.5 V + V
charging through R1. Q
is equal to V
Assuming that V
connected to pin (4) and R1 is an on-chip 10 kΩ resistor, the OSC frequency is calculated as follows:
1 t
2 t
f
V
OSC
OSC
=
=
−
−
=
C
C
BE
=
=
OSC
OSC
t
· 5
2
5.15
(Q
1
−
⎡
⎢
⎣
·
·
1
2)
t
OSC
R
1
R
·C
−
1
+ V(
· 1
· 1
=
exp
OSC
l
l
C
= 1.4 V (t = t
n
n
3
OSC
SAT)
⎛
⎜ ⎜
⎝
−
and Q
1 (
1 (
(kHz)(C
C
−
(Q
−
OSC
(R
1.4
2.85
4),
5
1
1·
5
4
·R
)
BE
OSC
are turned on when V
l
which is approximately equal to 1.4 V. V
---------------------- (2),
)
n
1
-------------------- (3),
(Q
1 (
⎞
⎟ ⎟
⎠
1
:
⎤
⎥
⎦
) and = 2.85 V (t = t
2),
µF)
-------------------
−
1.4
a value that is approximately equal to 2.85 V. V
5
.
1
)
−
R
· 1
1
(1).
l
through Q
n
1 (
OSC
6
−
2.85
becomes 2.85 V (High level.) The Low level of V (4) pin
2
5
), and given that C
4
))
and R1 through R4. Q
OSC
is calculated by following equation:
OSC
2
is the external capacitance
is turned off when V
OSC
is increased by C
TA8435H/HQ
2006-3-2
OSC
OSC
is