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TC170 bảng dữ liệu(PDF) 7 Page - TelCom Semiconductor, Inc

tên linh kiện TC170
Giải thích chi tiết về linh kiện  CMOS CURRENT MODE PWM CONTROLLER
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nhà sản xuất  TELCOM [TelCom Semiconductor, Inc]
Trang chủ  http://www.telcom-semi.com
Logo TELCOM - TelCom Semiconductor, Inc

TC170 bảng dữ liệu(HTML) 7 Page - TelCom Semiconductor, Inc

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TELCOM SEMICONDUCTOR, INC.
7
6
5
4
3
1
2
8
CMOS CURRENT MODE
PWM CONTROLLER
TC170
Figure 6 . Oscillator Circuit
Figure 7.
Oscillator Frequency vs Oscillator Resistance
where: RO = Oscillator Resistor (kΩ)
CO = Oscillator Capacitor (pF)
TD = Output Dead Time (sec)
Maximum possible duty cycle is set by the dead time.
50
45
40
35
30
25
20
15
10
5
0
20
40
60
80 100 120 140 160 180 200
TA = +25°C
250pF
500pF
OSCILLATOR FREQUENCY (kHz)
750pF
1000pF
2.3V 4.3V
I
CHARGE
2.3V
RO
8
CO
9
1 mA
DISCHARGE
CURRENT
SYNC
10
VDD
2.3V
PIN 8
PIN 10
1
ON-TIME
OUTPUT DEAD TIME (TD)
+
RO
FO
TD =
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 5 k
Ω to 50 kΩ.
Oscillator capacitor can range from 250 pF to 1000 pF.
Figure 7 shows typical operation for various resistance and
capacitance values.
During transitions between the two outputs, simulta-
neous conduction is prevented. Oscillator fall time controls
the output off, or dead time (Figure 6).
Dead time is approximately:
]
[
FO =
1.27
2800
CO
ROCO
RO
2C
O
CO + 150 × 10
–12
2000 [CO]
1 –
( )
2.3
RO


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