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AMC384XBD Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers

Part # AMC384XBD
Description  CURRENT MODE PWM CONTROLLER
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AMC DOC. #: AMC3842B_C (LF)
March
2004
AMC3842B/43B
DESCRIPTION
FEATURES
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 200
µA 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.
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.
®
ADD MICROTECH CORP. CURRENT MODE PWM CONTROLLER
APPLICATIONS
PACKAGE PIN OUT
Off-line flyback or forward
converters.
DC-to-DC buck or boost
converter.
Monitor Power Supply
8-Pin Plastic DIP
(Top View)
AVAILABLE OPTIONS
Device
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B
16V
6V
< 100%
AMC3843B
8.4V
0.8V
< 100%
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
8-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
VREF
COMP
VCC
VFB
ISENSE
OUTPUT
RT/CT
GND
VREF
COMP
NC
VCC
NC
VREF
COMP
VFB
VFB
VCC
VC
NC
ISENSE
ISENSE
OUTPUT
OUTPUT
RT/CT
GND
NC
GND
RT/CT
PWR
ORDER INFORMATION
Plastic DIP-8
Plastic SO-14
Plastic SO-8
TA (
OC)
M
8-pin
D
14-pin
DM
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
www.addmtek.com


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