IP1845 datasheet(5/6 Pages) SEME-LAB

tên linh kiện	IP1845

Giải thích chi tiết về linh kiện	CURRENT MODE REGULATING PULSE WIDTH MODULATORS

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LAB

SEME

IP1844 SERIES

IP1845 SERIES

Semelab plc. Telephone (01455) 556565. Telex: 341927. Fax (01455) 552612.

Prelim. 2/95

APPLICATIONS INFORMATION

V - Pin 4

(Pin 7 for 14 Pin D Package)

GND

REF

C T

R T

Internal Clock

Output – Max. Duty Cycle

V - Pin 6

(Pin 10 for 14 Pin D Package)

Output – Max. Duty Cycle

V - Pin 6

(Pin 10 for 14 Pin D Package)

V - Pin 4

(Pin 7 for 14 Pin D Package)

LARGE

SMALL

R T

C T

LARGE

SMALL

R T

C T

Oscillator Waveforms and Maximum Duty Cycle

Oscillator timing capacitor CT is charged by VREF through RT and discharged by an

internal current source. During the discharge time, the internal clock signal blanks the

output to the low state. Selection of RT and CT therefore determines both oscillator

frequency and maximum duty cycle.

Charge and discharge times are determined by the formulae:

tc ≈ 0.55 RTCT

td ≈ RTCT Rn

Resultant frequency f =

(tc + td)

For RT > 5kΩ,

1.8

Resultant frequency f

≈

(RTCT)

.0063 RT – 2.3

.0063 – 4

(

)

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