AMC3842B Datasheet, PDF (7/10 Pages) List of Unclassifed Manufacturers – CURRENT MODE PWM CONTROLLER

AMC DOC. #: AMC3842B_C (LF)
March 2004
AMC3842B/43B
CURRENT MODE PWM CONTROLLER
Application Information (continued)
1K
V_REF
COMP
330Ω
Shutdown
I_SENSE
500Ω
Shutdown
To Current
Sense Resistor
Fig. 5. Shutdown Techniques - there are two ways to shutdown the PWM controller: 1) raise the voltage at
I_SENSE above 1V or, 2) pull the COMP below a voltage two diodes above ground.
V_REF
R_T/C_T
I_SENSE
0.1µF ^RT
C_T
R₂
R₁
C
I_SENSE
R_SENSE
Fig 6. Slop Compensation – To achieve duty cycles over 50% for some applications , the above
slope compensation technique is suggested by resistively summing a fraction of the
oscillator ramp with the current sense signal.
Copyright © 2002, ADD Microtech Corp.
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