LM3842AD datasheet(4/7 Pages) HTC

Teilenummer	LM3842AD

Bauteilbeschribung	CURRENT MODE PWM CONTROLLER

Download	7 Pages

Scroll/Zoom	100%

Hersteller	HTC [HTC Korea TAEJIN Technology Co.]

Direct Link	http://www.htckorea.co.kr

Logo

4 / 7 page

CURRENT MODE PWM CONTROLLER

LM3842A/3A/4A/5A

Fig.4 Current Sense Circuit

Peak current (IS) is determined by the formula:

IS(MAX)

A small RC filter may be required to suppress switch transients.

Fig.5 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 formulas:

tc

0.55 RT CT

td

RT CT ∫n(

)

Frequency, then, is: f = (tc + td)

-1

For RT>5KΩ, f

HTC

4

1

3

5

IS

ERROR

AMP

2R

R

1V

CURRENT

SENSE

COMPARATOR

COMP

CURRENT

SENSE

GND

C

RS

R

~

1.0V

RS

~

0.0063 RT - 2.7

0.0063 RT - 4

~

1.8

RT CT

~

8

4

5

VREF

RT/CT

GND

LARGE RT

SMALL CT

V4

INTERNAL CLOCK

LARGE RT

SMALL CT

V4

INTERNAL CLOCK

RT

CT

Ähnliche Beschreibung - LM3842AD

Hersteller	Teilenummer	Datenblatt	Bauteilbeschribung
NXP Semiconductors	UC3842	74Kb / 8P	Current-mode PWM controller August 31, 1994
Daewoo Semiconductor	DBL3842	467Kb / 8P	CURRENT MODE PWM CONTROLLER
BCD Semiconductor Manuf...	AP384XC	176Kb / 13P	CURRENT MODE PWM CONTROLLER
Cystech Electonics Corp...	MC7731N6	363Kb / 10P	Current Mode PWM Controller
BCD Semiconductor Manuf...	AP3842C	359Kb / 14P	CURRENT MODE PWM CONTROLLER
Texas Instruments	UC1846AJ	3Mb / 13P	[Old version datasheet] Current Mode PWM Controller
	UC3844Q	708Kb / 28P	[Old version datasheet] CURRENT MODE PWM CONTROLLER
	UC1843	937Kb / 3P	[Old version datasheet] Current Mode PWM Controller
	UC2846J	463Kb / 8P	[Old version datasheet] Current Mode PWM Controller
List of Unclassifed Man...	AMC3842B	365Kb / 10P	CURRENT MODE PWM CONTROLLER
List of Unclassifed Man...	CM3842	638Kb / 12P	CURRENT MODE PWM CONTROLLER

More results

LM3842AD Datenblatt(PDF) 4 Page - HTC Korea TAEJIN Technology Co.

LM3842AD Datenblatt(HTML) 4 Page - HTC Korea TAEJIN Technology Co.

Ähnliche Teilenummer - LM3842AD

Ähnliche Beschreibung - LM3842AD

Html Pages

1 2 3 4 5 6 7

Datenblatt Download

Link URL