KA3842A [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: | KA3842A |
厂家: | WING SHING COMPUTER COMPONENTS |
描述: | Linear Integrated Circuit(CURRENT-MODE PWM CONTROLLER) |
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
a
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).
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
SO-8
DIP-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
VCC
Va lu e
Un it
V
30
Output Curre nt
IO
A
±1
Analog Inputs
V
I
V
- 0.3 to VCC
Error Amp Output Sink Curre nt
Powe r Dissipation (TA= 250C)
ISINK (E.A)
PO
10
1
mA
W
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
1
KA3842A/KA3842AM
Ele c tric a l c h a ra c te ris tic s (*VCC= 1 5 V, RT= 1 0 kW, CT= 3 . 3 n F, TA= 0 0 C to + 7 0 0 C, 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
VREF
4.9
5.0
6.0
5.1
20
V
TJ = 25°C, IREF = 1 mA
12V £ VCC £ 25 V
1 mA £ IREF £ 20mA
TA = 25°C
mV
DVREF
DVREF
ISC
Load Re gulation
6.0
25
Short Circit Output Curre nt
Os c illa to r S e c tio n
-100
-180
mA
Oscillation Fre gue ncy
f
47
52
57
KHz
%
TJ = 25°C
Fre que ncy Change with
Voltage
0.05
1.0
Df/ DVCCF
12V £ VCC £ 25 V
Oscillator Amplitude
Erro r Am p lifie r S e c tio n
Input Bias Curre nt
V
1.6
Vp-p
(OSC)
IBIAS
-0.1
2.5
90
-2
mA
V
Input Voltage
V
V1 = 2.5V
2.42
65
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
GVO
dB
2V £ V0 £ 4V
PSRR
ISINK
60
70
12V £ VCC £ 25 V
V2 = 2.7V, V1 = 1.1V
V2 = 2.3V, V1 = 5V
V2 = 2.3V, RL = 15KW to GND
V2 = 2.7V, RL = 15KW to PIN 8
2
7
mA
mA
V
ISOURCE
VOH
-0.5
5.0
-1.0
6.0
0.8
VOL
1.1
GV
(Note 1 & 2)
2.85
0.9
3.0
1.0
70
3.15
1.1
V/ V
V
Maximum Input Signal
Powe r Supply Re je ction Ratio
Input Bias Curre nt
V
I(MAX)
V1 = 5V (Note 1)
PSRR
IBIAS
dB
12V £ VCC £ 25 V (Note 1)
-3.0
-10
mA
Ou tp u t S e c tio n
Low Output Voltage
VOL
VOH
ISINK = 20 mA
0.08
1.4
0.4
2.2
ISINK = 200 mA
V
High Output Voltage
ISINK = 20 mA
13
12
13.5
13.0
45
ISINK = 200 mA
Rise Time
Fall Time
tR
tF
150
150
nS
TJ = 25°C, CL = 1nF (Note 3)
TJ = 25°C, CL = 1nF (Note 3)
35
Un d e r- Vo lta g e Lo c ko u t S e c tio n
Start The shold
VTH(ST)
14.5
8.5
16.0
10
17.5
11.5
V
V
Min. Ope rating Voltage
(Afte r Turn On)
VOPR(min)
P WM S e c tio n
Max. Duty Cycle
D(MAX)
D(MAX)
IST
95
97
100
0
%
Min. Duty Cycle
To ta l S ta n d b y Cu rre n t
Start- Up Curre nt
0.17
0.3
17
mA
V
Ope rating Supply Curre nt
Ze ne r Voltage
ICC (OPR)
VZ
V3 = V2 = 0V
14
38
30
* Adjust VCC above 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.
2
KA3842A/KA3842AM
P a d Lo c a tio n
Chip s ize : 2.38 x 1.63 mm
P a d
N
1
2
3
P a d
N
5
Co o rd in a te s mm
Co o rd in a te s mm
X
Y
110
110
110
150
X
Y
90
1680
1310
1450
1410
1050
1310
2000
6
4
7
8
815
460
1410
1390
3
KA3842A/KA3842AM
mm
inch
DIM.
OUTLINE AND
MECHANICAL DATA
MIN. TYP. MAX. MIN. TYP. MAX.
A
a1
a2
a3
b
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
b1
C
0.5
0.010
c1
D (1)
E
45° (typ.)
4.8
5.8
5.0
6.2
0.189
0.228
0.197
0.244
e
1.27
3.81
0.050
0.150
KA3842AM
e3
F (1)
L
KA3842AMM
3.8
0.4
4.0
0.15
0.157
0.050
0.024
1.27 0.016
0.6
M
SO8
S
8° (max.)
(1) D andF do not include mold flash or protrusions. Mold flash or
potrusions shall not exceed 0.15mm (.006inch).
4
KA3842A/KA3842AM
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
8
5
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
–B–
MILLIMETERS
INCHES
1
4
DIM
A
B
C
D
F
G
H
J
K
L
M
N
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
F
–A–
NOTE 2
L
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
C
10
1.01
10
0.040
0.76
0.030
J
–T–
SEATING
PLANE
N
M
D
K
G
H
M
M
M
0.13 (0.005)
T
A
B
KA3842AN
KA3842AMN
Attention: M=10o
5
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