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AMC3842B датащи(PDF) 6 Page - List of Unclassifed Manufacturers

номер детали AMC3842B
подробное описание детали  CURRENT MODE PWM CONTROLLER
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производитель  ETC [List of Unclassifed Manufacturers]
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AMC DOC. #: AMC3842B_C (LF)
AMC3842B/43B
March
2004
CURRENT MODE PWM CONTROLLER
Copyright
© 2002, ADD Microtech Corp.
6
www.addmtek.com
Application Information
Fig. 1. Current Sense Circuit
Peak current (IS) is set by: IS(MAX) = 1V/RS
Fig. 3. Oscillator Section
1.72
Fig. 2. Error Amplifier Configuration - the
amplifier can source or sink up to 0.5mA
For RT < 5K, f =
RTCT
Error
Amp
2R
1V
R
Current
Sense
Comparator
COMP
Rf
ISENSE
RS
Cf
GND
VREF
2.5V
0.5mA
Error
Amp
RT
RT/CT
VFB
Zi
CT
GND
COMP
Zf
Fig. 4. Open-loop laboratory test fixture: Careful grounding techniques are necessary for high peak
currents associated with capacitive loads. Timing and bypass capacitors should be connected to GND pin
in a single point ground. The transistor and 5K potentiometer are used to sample the oscillator waveform
and apply an adjustable ramp to the ISENSE pin
VREF
RT
VCC
2N2222
4.7K
100K
VREF
COMP
0.1
µF
1K
Error AMP
Adjust
1K,
1W
VFB
VCC
5K
ISENSE
Adjust
Output
ISENSE Output
4.7K
0.1
µF
RT/CT
GND
GND
CT


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