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TL3842PE4 Datasheet(PDF) 8 Page - Texas Instruments

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Part No. TL3842PE4
Description  CURRENT-MODE PWM CONTROLLERS
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

TL3842PE4 Datasheet(HTML) 8 Page - Texas Instruments

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TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G − JANUARY 1989 − REVISED FEBRUARY 2008
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Zi
Zf
VFB
COMP
2.5 V
0.5 mA
Error
Amplifier
NOTE A:
Error amplifier can source or sink up to 0.5 mA.
+
Figure 1. Error-Amplifier Configuration
NOTE A: Peak current (IS) is determined by the formula:
A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients.
COMP
ISENSE
GND
RS
Cf
Rf
Error
Amplifier
2R
R1 V
Current-Sense
Comparator
I
S(max) +
1V
R
S
IS
(see Note A)
+
Figure 2. Current-Sense Circuit
CT
RT
(see Note A)
NOTE A: For RT > 5 kΩ:
REF
RT/CT
GND
f
[ 1.72
R
TCT
Figure 3. Oscillator Section


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