AMC384XBD ETC [List of Unclassifed Manufacturers], AMC384XBD Datasheet

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AMC384XBD

Manufacturer Part Number
AMC384XBD
Description
CURRENT MODE PWM CONTROLLER
Manufacturer
ETC [List of Unclassifed Manufacturers]
Datasheet
1.AMC384XBD.pdf (10 pages)
AMC DOC. #: AMC3842B_C (LF)
March 2004
Copyright © 2002, ADD Microtech Corp.
Note: 1.All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e.
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.
Device
AMC3842B
AMC3843B
T
0 to 70
0 to 70
Off-line flyback or forward
converters.
DC-to-DC buck or boost
converter.
Monitor Power Supply
A
(
2.The letter ”F” is marked for Lead Free process.
O
AVAILABLE OPTIONS
C)
®
AMC384XBDT, or AMC384XBDMT).
A
APPLICATIONS
Start-UP
Voltage
16V
8.4V
DD MICROTECH CORP.
AMC384XBM
AMC384XBMF(Lead Free)
M
Hysteresis
6V
0.8V
DESCRIPTION
Plastic DIP-8
8-pin
Max. Duty
Cycle
< 100%
< 100%
ORDER INFORMATION
COMP
AMC384XBD
AMC384XBDF(Lead Free)
I
R
SENSE
V
NC
T
NC
NC
D
/C
14-Pin Plastic S.O.I.C.
FB
T
Surface Mount
1
Plastic SO-14
14-pin
(Top View)
C
URRENT
COMP
R
I
PACKAGE PIN OUT
SENSE
T
V
/C
UC384X series.
Identical pin assignment to earlier
Low Start-Up current ( typ. 200 µA)
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.
FB
8-Pin Plastic DIP
T
V
NC
V
V
OUTPUT
GND
PWR
REF
CC
C
(Top View)
M
ODE
AMC384XBDM
AMC384XBDMF(Lead Free)
AMC3842B/43B
DM
FEATURES
COMP
R
I
PWM C
SENSE
T
V
V
OUTPUT
GND
V
/C
8-Pin Plastic S.O.I.C.
REF
CC
FB
T
Plastic SO-8
8-pin
Surface Mount
(Top View)
ONTROLLER
www.addmtek.com
V
V
OUTPUT
GND
REF
CC

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AMC384XBD Summary of contents

Page 1

... AMC384XBM AMC384XBMF(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 URRENT ODE Low Start-Up current ( typ. 200 µ ...

Page 2

AMC DOC. #: AMC3842B_C (LF) March 2004 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply voltage Output current Analog inputs Error amp output sink current, I SINK(EA) O Power dissipation ( C ...

Page 3

AMC DOC. #: AMC3842B_C (LF) March 2004 Internal Bias V REF (14) REF Error Amp (1) COMP CURRENT 3 (5) SENSE 4 ( Oscillator ( ) are 14 ...

Page 4

AMC DOC. #: AMC3842B_C (LF) March 2004 RECOMMENDED OPERATING CONDITIONS Parameter Supply Voltage Input Voltage Output Voltage Supply Current Average Output Current Reference Output Current Timing Capacitor Oscillator Frequency Operating Free-air Temperature Unless otherwise specified, these specifications apply over the ...

Page 5

AMC DOC. #: AMC3842B_C (LF) March 2004 ELECTRICAL CHARACTERISTICS (Continued) Error Amplifier Section Input Bias Current Input Voltage Open Loop Voltage Gain Unity Gain Bandwidth (note 7) Power Supply Rejection Ratio Output Sink Current Output Source Current High Output Voltage ...

Page 6

AMC DOC. #: AMC3842B_C (LF) March 2004 R S Fig. 1. Current Sense Circuit 2. COMP Z f Fig. 2. Error Amplifier Configuration amplifier can source or sink up to 0.5mA 2N2222 4.7K 100K 1K Error ...

Page 7

AMC DOC. #: AMC3842B_C (LF) March 2004 1K 330Ω Shutdown 500Ω To Current Sense Resistor Fig. 5. Shutdown Techniques - there are two ways to shutdown the PWM controller: 1) raise the voltage at I above 1V or, 2) pull ...

Page 8

AMC DOC. #: AMC3842B_C (LF) March 2004 8-Pin Plastic DIP 8-Pin Plastic S.O.I. SEATING PLAN Copyright © 2002, ADD Microtech ...

Page 9

AMC DOC. #: AMC3842B_C (LF) March 2004 14-Pin Plastic S.O.I. SEATING PLAN Copyright © 2002, ADD Microtech Corp. C URRENT AMC3842B/43B M PWM C ODE ONTROLLER INCHES MILLIMETERS ...

Page 10

AMC DOC. #: AMC3842B_C (LF) March 2004 ADD Microtech (ADDM) reserves the right to make changes to its products or to discontinue any integrated circuit product or service without notice, and advises its customers to obtain the latest version of ...

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