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| 型號(hào)： | TC170 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | CMOS Current Mode PWM Controller |
| 中文描述： | CMOS電流模式PWM控制器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 104K |
| 代理商： | TC170 |
4-125
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: R
O
= Oscillator Resistor (k
)
C
O
= Oscillator Capacitor (pF)
T
D
= 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
OSCILLATOR FREQUENCY (kHz)
20
40
60
80 100 120 140 160 180 200
TA= +25°C
250pF
500pF
O
)
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
T
D
=
Oscillator Frequency and Output Dead Time
The oscillator frequency for R
O
= 24k
and
C
O
= 1000pF is:
]
[
–
where: R
O
= Oscillator Resistor (
)
C
O
= Oscillator Capacitor (F)
F
O
= Oscillator Frequency (Hz)
The oscillator resistor can range from 5 k
to 50 k
.
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:
F
O
=
1.27
R
O
C
O
2800
R
O2
C
O
C
O
C
O
+ 150
×
10
–12
2000 [C
O
]
1 –
( )
2.3
R
O
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