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AMC3843B

ETC
Part Number AMC3843B
Manufacturer ETC
Description (AMC3842B / AMC3843B) CURRENT MODE PWM CONTROLLER
Published Sep 21, 2005
Detailed Description AMC DOC. #: AMC3842B_C (LF) March 2004 ® AMC3842B/43B CURRENT MODE PWM CONTROLLER FEATURES ADD MICROTECH CORP. DESCRIP...
Datasheet PDF File AMC3843B PDF File

AMC3843B
AMC3843B

Overview
AMC DOC.
#: AMC3842B_C (LF) March 2004 ® AMC3842B/43B CURRENT MODE PWM CONTROLLER FEATURES ADD MICROTECH CORP.
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.
APPLICATIONS 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.
PACKAGE PIN OUT COMP VFB ISENSE RT/CT VREF VCC OUTPUT GND Off-line flyback or forward converters.
DC-to-DC buck or boost converter.
Monitor Power Supply AVAILABLE OPTIONS Device AMC3842B AMC3843B Start-UP Max.
Duty Hysteresis Voltage Cycle 16V 8.
4V 6V 0.
8V < 100% < 100% COMP NC VFB NC ISENSE NC RT/CT 8-Pin Plastic DIP (Top View) VREF NC VCC VC OUTPUT GND PWR RT/CT COMP VFB ISENSE VREF VCC OUTPUT GND 14-Pin Plastic S.
O.
I.
C.
Surface Mount (Top View) 8-Pin Plastic S.
O.
I.
C.
Surface Mount (Top View) ORDER INFORMATION Plastic DIP-8 Plastic SO-14 Plastic SO-8 M D DM TA (OC) 8-pin 14-pin 8-pin 0 to 70 AMC384XBM AMC384XBD AMC384XBDM 0 to 70 ...


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