CS2841BED14 Datasheet CS2841BEBN8, CS2841BEDR14G, CS2841BEBN8G | P7-P9

CS2841B

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7

t

c

+ R

T

C

T

ln

ǒ

V

REF

* V

lower

V

REF

* V

upper

Ǔ

t

d

+ R

T

C

T

ln

ǒ

V

REF

* I

d

R

T

* V

upper

V

REF

* I

d

R

T

* V

lower

Ǔ

Substituting in typical values for the parameters in the

above formulas:

V

REF

+ 5.0V

V

upper

+ 2.7V

V

lower

+ 1.0V

I

d

+ 8.3mA

t

c

[ 0.5534R

T

C

T

t

d

+ R

T

C

T

ln

ǒ

2.3 * 0.0083R

T

4.0 * 0.0083R

T

Ǔ

The frequency and maximum duty cycle can be

determined from the Typical Performance Characteristic

graphs.

Grounding

High peak currents associated with capacitive loads

necessitate careful grounding techniques. Timing and

bypass capacitors should be connected close to GND pin in

a single point ground.

The transistor and 5.0 kW potentiometer are used to

sample the oscillator waveform and apply an adjustable

ramp to Sense.

C8

VC

C10

0.1 mF

10 mF

0.1 mF

C9

C13

4.7 nF

OSC

V

REF

V

CC

PV

CC

V

OUT

SENSE

COMP

V

FB

GND PGND

R8

4.99 k

1.0 %

C14

47 pF

R7

22.1 k

C11

0.33 mF

R6

1.0 k

R4

10

C12

10 nF

R3

4.99 k

1.0 %

MTDISN06VTL4

R9

0.2

1.0 %

Q2

VPR

GND

Q1

2n4401

DZ1

13 V

1N5243B

R1

4.7 k

C1

68 mF

C2

C3

4.7 pF

100 V

MURS120T3

D1

R2

47

V

CC

V

CC

-GND

0.1 mF

C7

1000 mF

C5

1000 mF

C6

C4

0.1 mF

D2 MBR360

L1

2.2 mH

9T

V

CC

= 5.0 V @ 750 mA

R5

2.0 k

CS2841B

20T

Figure 8. Flyback Application

CS2841B

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8

Figure 9. Boost Application

C4

C6

0.1 mF

10 mF

0.1 mF

C5

C9

470 pF

OSC

V

REF

V

CC

V

OUT

SENSE

COMP

FB

GND

R8

2.0 k

C8

1.0 nF

R5

100

R3

10

C7

MTP12N10

R7

1.0

Q1

VPR

GND

1N5818

R2

10

C1

R1

100 V

D2

17 V

D1

1N5818

L1

100 mH

Input Voltage Range: 8.0 V to 16 V

Output Voltage: 17 V @ 100 mA > 300 mA

R4

3.0 k

CS2841B

0.01 mF

R6

10 k

100 mF

12 k

C3

C2

0.1 mF

330 mF

PACKAGE THERMAL DATA

Parameter

PDIP-8 SOIC-14 Unit

R

q

JC

Typical 52 30 °C/W

R

q

JA

Typical 100 125 °C/W

CS2841B

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9

PACKAGE DIMENSIONS

PDIP-8

CASE 626-05

ISSUE L

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN

FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR

SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI

Y14.5M, 1982.

14

58

F

NOTE 2

-A-

-B-

-T-

SEATING

PLANE

H

J

G

D

K

N

C

L

M

A

M

0.13 (0.005) B

M

T

DIM MIN MAX MIN MAX

INCHESMILLIMETERS

A 9.40 10.16 0.370 0.400

B 6.10 6.60 0.240 0.260

C 3.94 4.45 0.155 0.175

D 0.38 0.51 0.015 0.020

F 1.02 1.78 0.040 0.070

G 2.54 BSC 0.100 BSC

H 0.76 1.27 0.030 0.050

J 0.20 0.30 0.008 0.012

K 2.92 3.43 0.115 0.135

L 7.62 BSC 0.300 BSC

M --- 10 --- 10

N 0.76 1.01 0.030 0.040

__

CS2841BED14

CS2841BED14

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