KA3842AM [Wing Shing]

Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER); 线性集成电路（电流模式PWM控制器）


型号：	KA3842AM
厂家：	WING SHING COMPUTER COMPONENTS
描述：	Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER) 线性集成电路（电流模式PWM控制器）控制器
文件：	总5页 (文件大小：180K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Linear Integrated Circuit

KA3842A

KA3842AM

CURRENT- MODE P WM CONTROLLER

PIN CONNECTION

The KA3842A

are fixe fre que ncy curre nt-mode

PWM controlle r. The y are spe cially de signe d for OFF- Line and DC- to- DC conve rte r

applications with minimal e xte rnal compone nts. The se inte grate d circuits fe ature

trimme d oscillator for pre cise duty cycle control, a te mpe rature compe nsate d re fe re nce ,

KA3842AM

high gain e rror amplifie r, curre nt se nsing comparator, and

output ide ally suite d for driving a powe r MOSFET.

a high curre nt tote mpole

Prote ction circuity include s built unde r- voltage lockout and curre nt limiting.

The

KA3842A,KA3842AM

have UVLO thresholds of 16 V(on) and 10 V (off).

can

The KA3842A ,KA384AM

operate

duty cycle

The KA3842A has been proven

within 100%

in applications

using the same external components as Motorola's parts,among others .The KA3842AM

Many applications can use either

have Start-Up Curre nt 0,45 mA

has been optimized for compatibility with Samsung's parts

The KA3842A

KA3842AM

KA3842A or KA3842AM

SO-8

DIP-8

FEATURES

o rd e rin g

Low Start-Up Curre nt

Maximum Duty Cycle

U/ V Lockout With Hyste re sis

Ope rating Fre gue ncy Up To 500khz

in fo rm a tio n

De vice

Package

Ope rating te mpe rature

0 to + 70⁰C

KA3842AM

KA3842AMM

KA3842AN

SO-8

DIP-8

KA3842AMN

BLOCK DIAGRAM

Ab s o lu te Ma xim u m Ra tin g s

Ch a ra c te ris tic

Supply Voltage

S ym b o l

V_CC

Va lu e

Un it

Output Curre nt

I_O

±1

Analog Inputs

- 0.3 to V_CC

Error Amp Output Sink Curre nt

Powe r Dissipation (T_A= 25⁰C)

I_{SINK (E.A)}

P_O

Wing Shing Computer Components Co., (H.K.)Ltd.

Homepage: http://www.wingshing.com

Tel:(852)2341 9276 Fax:(852)2797 8153

E-mail: wsccltd@hkstar.com

KA3842A/KA3842AM

Ele c tric a l c h a ra c te ris tic s (*V_CC= 1 5 V, R_T= 1 0 kW, C_T= 3 . 3 n F, T_A= 0 ⁰C to + 7 0 ⁰C, u n le s s

o th e rwis e s p e c ifie d )

Ch a ra c te ris tic s

Re fe re n c e S e c tio n

Re fe re nce Output Volte ge

Line Re gulation

S ym b o l

Te s t Co n d itio n

Min

Typ

Ma x

Un it

V_REF

4.9

5.0

6.0

5.1

T_J= 25°C, I_REF= 1 mA

12V £ V_CC£ 25 V

1 mA £ I_REF£ 20mA

T_A= 25°C

DV_REF

I_SC

Load Re gulation

6.0

Short Circit Output Curre nt

Os c illa to r S e c tio n

-100

-180

Oscillation Fre gue ncy

KHz

T_J= 25°C

Fre que ncy Change with

Voltage

0.05

1.0

Df/ DV_CCF

12V £ V_CC£ 25 V

Oscillator Amplitude

Erro r Am p lifie r S e c tio n

Input Bias Curre nt

1.6

V_p-p

(OSC)

I_BIAS

-0.1

2.5

-2

Input Voltage

V₁= 2.5V

2.42

2.58

I(E.A)

Ope n Loop Voltage Gain

Powe r Supply Re je ction Ratio

Output Sink Curre nt

Output Source Curre nt

High Output Voltage

Low Output Voltage

Cu rre n t S e n s e S e c tio n

Gain

G_VO

2V £ V0 £ 4V

PSRR

I_SINK

12V £ V_CC£ 25 V

V₂= 2.7V, V₁= 1.1V

V₂= 2.3V, V₁= 5V

V₂= 2.3V, R_L= 15KW to GND

V₂= 2.7V, R_L= 15KW to PIN 8

I_SOURCE

V_OH

-0.5

5.0

-1.0

6.0

0.8

V_OL

1.1

G_V

(Note 1 & 2)

2.85

0.9

3.0

1.0

3.15

1.1

V/ V

Maximum Input Signal

Powe r Supply Re je ction Ratio

Input Bias Curre nt

I(MAX)

V₁= 5V (Note 1)

PSRR

I_BIAS

12V £ V_CC£ 25 V (Note 1)

-3.0

-10

Ou tp u t S e c tio n

Low Output Voltage

V_OL

V_OH

I_SINK= 20 mA

0.08

1.4

0.4

2.2

I_SINK= 200 mA

High Output Voltage

I_SINK= 20 mA

13.5

13.0

I_SINK= 200 mA

Rise Time

Fall Time

t_R

t_F

150

T_J= 25°C, C_L= 1nF (Note 3)

Un d e r- Vo lta g e Lo c ko u t S e c tio n

Start The shold

V_TH(ST)

14.5

8.5

16.0

17.5

11.5

Min. Ope rating Voltage

(Afte r Turn On)

V_OPR(min)

P WM S e c tio n

Max. Duty Cycle

D_(MAX)

I_ST

100

Min. Duty Cycle

To ta l S ta n d b y Cu rre n t

Start- Up Curre nt

0.17

0.3

Ope rating Supply Curre nt

Ze ne r Voltage

I_{CC (OPR)}

V_Z

V₃= V₂= 0V

* Adjust V_CCabove the start thre shold be fore se tting at 15V

Note 1: Parame te r me asure d at trip point of lath with V₂= 0

Note 2: Gain de fine d as A= DV₁/ DV₃; 0 £ V₃£ 0.8V

Note 3: The se parame te rs, although guarante e d, are not 100% te ste d in production.

KA3842A/KA3842AM

P a d Lo c a tio n

Chip s ize : 2.38 x 1.63 mm

P a d

Co o rd in a te s mm

110

150

1680

1310

1450

1410

1050

1310

2000

815

460

1410

1390

KA3842A/KA3842AM

inch

DIM.

OUTLINE AND

MECHANICAL DATA

MIN. TYP. MAX. MIN. TYP. MAX.

1.75

0.069

0.010

0.065

0.033

0.019

0.010

0.020

0.1

0.25 0.004

1.65

0.65

0.35

0.19

0.25

0.85 0.026

0.48 0.014

0.25 0.007

0.5

0.010

D (1)

45° (typ.)

4.8

5.8

5.0

6.2

0.189

0.228

0.197

0.244

1.27

3.81

0.050

0.150

KA3842AM

F (1)

KA3842AMM

3.8

0.4

4.0

0.15

0.157

0.050

0.024

1.27 0.016

0.6

SO8

8° (max.)

(1) D andF do not include mold flash or protrusions. Mold flash or

potrusions shall not exceed 0.15mm (.006inch).

KA3842A/KA3842AM

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.

–B–

MILLIMETERS

INCHES

DIM

MIN

9.40

6.10

3.94

0.38

1.02

MAX

10.16

6.60

4.45

0.51

1.78

MIN

MAX

0.400

0.260

0.175

0.020

0.070

0.370

0.240

0.155

0.015

0.040

–A–

NOTE 2

2.54 BSC

0.100 BSC

0.76

0.20

2.92

7.62 BSC

–––

1.27

0.30

3.43

0.030

0.008

0.115

0.300 BSC

–––

0.050

0.012

0.135

1.01

0.040

0.76

0.030

–T–

SEATING

PLANE

0.13 (0.005)

KA3842AN

KA3842AMN

Attention: M=10^o

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