TC170CPE datasheet(7/8 Pages) TELCOM

No. de pieza	TC170CPE

Descripción Electrónicos	CMOS CURRENT MODE PWM CONTROLLER

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Fabricante Electrónico	TELCOM [TelCom Semiconductor, Inc]

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TELCOM SEMICONDUCTOR, INC.

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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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TC170CPE Datasheet(PDF) 7 Page - TelCom Semiconductor, Inc

TC170CPE Datasheet(HTML) 7 Page - TelCom Semiconductor, Inc

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