AMC3842B Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – CURRENT MODE PWM CONTROLLER

AMC DOC. #: AMC3842B_C (LF)
March 2004
A®
DD MICROTECH CORP.
AMC3842B/43B
CURRENT MODE PWM CONTROLLER
DESCRIPTION
The AMC3842B/43B are fixed frequency current-mode
PWM controllers specially designed for OFF-Line switching
power supply and DC-to-DC converters with a minimum
number of external components. These devices feature a
trimmed oscillator for precise duty cycle control, a
temperature compensated reference, high gain error
amplifier, current sensing comparator, and high current
totem pole output which is suitable for driving MOSFETs.
The under voltage lock-out (U.V.L.O.) is designed to
operated with 200µA typ. start-up current, allowing an
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the AMC3842B are 16V (on) and 10V (off)
which are ideal for off-line applications. The corresponding
typical threshold for the AMC3843B are 8.4V (on) and 7.6V
(off). The AMC3842B/43B can operated within 100% duty
cycle.
FEATURES
Low Start-Up current ( typ. 200µA)
Optimized for Off-Line and
DC-to-DC Converters
Maximum Duty Cycle
U.V.L.O. with Hysteresis
Operating Frequency Up to 500KHz
Internal Trimmed Bandgap Reference
High Current Totem Pole Output
Error Amplifier With Low Output
Resistance
Available in 8-Pin Plastic DIP and
Surface Mount 14-Pin S.O.I.C.
Identical pin assignment to earlier
UC384X series.
APPLICATIONS
Off-line flyback or forward
converters.
DC-to-DC buck or boost
converter.
Monitor Power Supply
AVAILABLE OPTIONS
Device
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B 16V 6V
< 100%
AMC3843B 8.4V 0.8V
< 100%
PACKAGE PIN OUT
COMP
V_FB
I_SENSE
R_T/C_T
V_REF
V_CC
OUTPUT
GND
COMP
8-Pin Plastic DIP
(Top View)
V_REF
NC
V_FB
NC
I_SENSE
NC
NC
V_CC
V_C
OUTPUT
GND
COMP
V_FB
I_SENSE
R_T/C_T
V_REF
V_CC
OUTPUT
GND
R_T/C_T
PWR
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
ORDER INFORMATION
T_A (^OC)
M ^{Plastic DIP-8}
8-pin
D ^{Plastic SO-14}
14-pin
DM ^{Plastic SO-8}
8-pin
0 to 70 AMC384XBM
AMC384XBD
AMC384XBDM
0 to 70 AMC384XBMF(Lead Free) AMC384XBDF(Lead Free) AMC384XBDMF(Lead Free)
Note: 1.All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e.
AMC384XBDT, or AMC384XBDMT).
2.The letter ”F” is marked for Lead Free process.
Copyright © 2002, ADD Microtech Corp.
1
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