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| AMC3842B Datasheet, PDF (8/11 Pages) List of Unclassifed Manufacturers – CURRENT MODE PWM CONTROLLER | |||
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AMC3842B/43B/44B/45B
APPLICATION INFORMATION (continued)
1K
VREF
COMP
330â¦
Shutdown
ISENSE
500â¦
To Current
Sense Resistor
Shutdown
Fig. 5. Shutdown Techniques - there are two ways to shutdown the PWM controller: 1) raise the voltage at
ISENSE above 1V or, 2) pull the COMP below a voltage two diodes above ground.
VREF
RT/CT
ISENSE
0.1µF RT
CT
R2
R1
C
ISENSE
RSENSE
Fig 6. Slop Compensation â 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 © 2006 ADDtek Corp.
8
DD019_F -- OCTOBER 2006
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