LND3843B datasheet(3/10 Pages) LINEAR_DIMENSIONS

Part #	LND3843B

Description	Current Mode PWM Controller

Download	10 Pages

Scroll/Zoom	100%

Manufacturer	LINEAR_DIMENSIONS [Linear Dimensions Semiconductor]

Direct Link	http://www.lineardimensions.com

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3 / 10 page

(*Vcc =15 V, RT=10k

Ω ,CT=3.3nF, TA=0 to 70° C, unless otherwise specified )

Characteristics

Symbol

Test Conditions

Min

Typ

Max

Unit

Reference Section

Reference Output Voltage

VREF

TJ =25

°C, IREF=1mA

4.9

5.0

5.1

V

Line Regulation

∆VREF

12V

≤VCC≤25V

6.0

20

Load Regulation

∆ VREF

1mA

≤ IREF≤20mA

6.0

25

mV

Short Circuit Output

Current

ISC

TA=25

°C

100

180

mA

Oscillator Section

Oscillation Frequency

f

TJ=25

°C

47

52

57

KHz

Frequency change with

Voltage

∆f/∆Vcc

12V

≤VCC≤25V

0.05

1.0

%

Oscillator Amplitude

V(OSC)

(Peak to Peak)

1.6

V

Error Amplitude Section

Input Bias Current

IBIAS

VFB=3V

-0.1

-2

µA

Input Voltage

VI(E,A)

Vpin1=2.5V

2.5

2.58

V

Open Loop Voltage Gain

AVOL

2V

≤VO≤4V

65

90

Power Supply Rejection

ratio

PSRR

12V

≤VCC≤25V

60

70

dB

Output Sink Current

ISINK

Vpin2 =2.7V, Vpin1=1.1V

2

7

mA

Output Source current

ISOURCE

Vpin2=2.3V, Vpin1=5V

-0.5

-1.0

mA

High Output Voltage

VOH

Vpin2=2.3V,RL=15k

Ω to

GND

5.0

6.0

Low Output Voltage

VOL

Vpin2=2.7V,RL=15k

Ω t o

PIN 8

0.8

1.1

V

Current Sense Section

Gain

GV

(Note 1& 2)

2.85

3.0

3.15

V/V

Maximum Input Signal

VI(MAX)

Vpin1 =5V(note 1)

0.9

1.0

1.1

V

Supply Voltage rejection

SVR

12V

≤Vcc≤25V(note 1)

70

dB

Input Bias Current

IBIAS

Vpin3= 3V

-3.0

-10

µA

Output Section

Isink=20mA

0.08

0.4

Low Output Voltage

VOL

Isink=200mA

1.4

2.2

Isink=20mA

13

13.5

High Output Voltage

VOH

Isink=200mA

12

13.0

V

Rise Time

tR

TJ=25

°C, CL =1nF(note

3)

45

150

nS

Fall time

tF

TJ=25

°C, CL =1nF(note

3)

35

150

nS

Undervoltage Lockout Section

LND3842A,B/44A,B

14.5

16.0

17.5

Start Threshold

VTH(ST)

LND3842A,B/45A,B

7.8

8.4

9.0

V

LND3842A,B/44A,B

8.5

10

11.5

Min. Operating Voltage

(After Turn on)

VOPR(MIN)

LND3842A,B/45A,B

7.0

7.6

8.2

V

PWM Section

LND3842A,B/43A,B

95

97

100

Max. Duty Cycle

D(MAX)

LND3842A,B/45A,B

47

48

50

%

Min. Duty cycle

D(MAX)

0

Total Standby Current

LND3842A/43A/44A/45A

0.17

0.3

Start-Up current

IST

LND3842B/43B/44B/45B

0.45

1

mA

Operating Supply Current

ICC(OPR)

VPIN3=VPIN2 =0V

13

17

mA

Zener Voltage

VZ

ICC=25mA

30

38

V

ELECTRICAL CHARACTERISTICS

LND3842/43/44/45

• Linear Dimensions, Inc. • 445 East Ohio Street, Chicago IL 60611 USA • tel 312.321.1810 • fax 312.321.1830 • www.lineardimensions.com •

*Adjust VCC above the start threshold before setting it to 15V.

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