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TC170CPE Datenblatt(Datasheet) 9 Page - Microchip Technology

Teile-Nr. TC170CPE
Beschreibung  CMOS Current Mode PWM Controller
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Hersteller  MICROCHIP [Microchip Technology]
Homepage  http://www.microchip.com
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 9 page
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© 2002 Microchip Technology Inc.
DS21395B-page 9
TC170
FIGURE 3-7:
OSCILLATOR CIRCUIT
3.8
Oscillator Frequency and Output
Dead Time
The oscillator frequency for RO = 24kΩ and CO =
1000pF is:
where:
RO = Oscillator Resistor (Ω)
CO = Oscillator Capacitor (F)
FO = Oscillator Frequency (Hz)
The oscillator resistor can range from 5k
Ω to 50kΩ.
Oscillator capacitor can range from 250pF to 1000pF.
Figure 3-8
shows
typical
operation
for
various
resistance and capacitance values.
During
transitions
between
the
two
outputs,
simultaneous conduction is prevented. Oscillator fall
time controls the output off, or dead time (Figure 3-7).
Dead time is approximately:
where:
RO = Oscillator Resistor (kΩ)
CO = Oscillator Capacitor (pF)
TD = Output Dead Time (sec)
Maximum possible duty cycle is set by the dead time.
FIGURE 3-8:
OSCILLATOR
FREQUENCY VS.
OSCILLATOR
RESISTANCE
2.3V 4.3V
ICHARGE ≈ 2.3V
8
9
1mA
Discharge
Current
Sync
10
2.3V
Pin 8
Pin 10
1
On-Time
Output Dead Time (TD)
+
FO
VDD
CO
RO
RO
ROCO
RO
2C
O
CO +150 x10
–12
FO=
1.27
2800
CO
[
]
1–
TD=
2000 [CO]
( )
2.3
RO
50
45
40
35
30
25
20
15
10
5
0
20
40
60
80 100 120 140 160 180 200
250pF
500pF
OSCILLATOR FREQUENCY (kHz)
750pF
1000pF
TA = +25°C




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