AMC3842B Datasheet, PDF (1/11 Pages) List of Unclassifed Manufacturers – CURRENT MODE PWM CONTROLLER

AMC3842B/43B/44B/45B
www.addmtek.com
CURRENT MODE PWM CONTROLLER
DESCRIPTION
FEATURES
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
Converters
with a minimum number of external components. These
devices 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
series.
within 50% duty cycle.
APPLICATIONS
„ Off-line flyback or forward converters.
„ DC-to-DC buck or boost converter.
„ Monitor Power Supply
Device
AVAILABLE OPTIONS
Start-UP
Voltage
Hysteresis
Max. Duty
Cycle
AMC3842B 16V
6V
< 100%
AMC3843B 8.4V
0.8V
< 100%
AMC3844B 16V
AMC3845B 8.4V
6V
0.8V
< 50%
< 50%
PACKAGE PIN OUT
COMP
V_REF
V_FB
V_CC
I_SENSE
OUTPUT
R_T/C_T
GND
8-Pin Plastic DIP
(Top View)
COMP
NC
V_FB
NC
I_SENSE
NC
R_T/C_T
V_REF
NC
V_CC
V_C
OUTPUT
GND
PWR
14-Pin Plastic S.O.I.C.
Surface Mount
(Top View)
COMP
V_FB
I_SENSE
R_T/C_T
V_REF
V_CC
OUTPUT
GND
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 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
AMC384XBDMT).
2. The letter ”F” is marked for Lead Free process.
Copyright © 2006 ADDtek Corp.
1
DD019_F -- OCTOBER 2006