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).
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
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
Wing Shing [ WING SHING COMPUTER COMPONENTS ]
