CURRENT MODE PWM CONTROLLER
The AMC3842B/43B/44B/45B are fixed frequency Low Start-Up current (max. 200µA)
current-mode PWM controllers specially designed for Optimized for Off-Line and DC-to-DC
OFF-Line switching power supply and DC-to-DC converters
with a minimum number of external components. These
www.DataSheet4dUev.ciocmes feature a trimmed oscillator for precise duty cycle Maximum Duty Cycle
control, a temperature compensated reference, high gain error U.V.L.O. with Hysteresis
amplifier, current sensing comparator, and high current totem Operating Frequency Up to 500KHz
pole output which is suitable for driving MOSFETs.
Internal Trimmed Bandgap Reference
The under voltage lock-out (U.V.L.O.) is designed to High Current Totem Pole Output
operated with 200µA start-up current in typical, allowing an Error Amplifier With Low Output Resistance
efficient bootstrap supply voltage design. The U.V.L.O.
thresholds for the AMC3842B/44B are 16V (on) and 10V
Available in 8-Pin Plastic DIP and Surface
(off), which are ideal for off-line applications. The
Mount 14-Pin S.O.I.C.
corresponding typical threshold for the AMC3843/45BB is Identical pin assignment to earlier UC384X
8.4V (on) and 7.6V (off). The AMC3842B/43B can operate
within 100% duty cycle and the AMC3844B/45B can operate
within 50% duty cycle.
Off-line flyback or forward converters.
DC-to-DC buck or boost converter.
Monitor Power Supply
PACKAGE PIN OUT
8-Pin Plastic DIP
14-Pin Plastic S.O.I.C.
8-Pin Plastic S.O.I.C.
0 to 70 AMC384XBM
0 to 70 AMC384XBM (Lead Free) AMC384XBD (Lead Free) AMC384XBDM (Lead Free)
Note: 1. All surface-mount packages are available in Tape & Reel. Append the letter “T” to part number (i.e. AMC384XBDT, or
2. The letter ”F” is marked for Lead Free process.
Copyright © 2006 ADDtek Corp.
1 DD019_F -- OCTOBER 2006