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| TL284X_101 Datasheet, PDF (8/21 Pages) Texas Instruments – CURRENT-MODE PWM CONTROLLERS | |||
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TL284x, TL384x
CURRENT-MODE PWM CONTROLLERS
SLVS038G â JANUARY 1989 â REVISED FEBRUARY 2008
APPLICATION INFORMATION
2.5 V
Error
Amplifier
Zi
VFB
+
â
Zf
COMP
0.5 mA
NOTE A: Error amplifier can source or sink up to 0.5 mA.
Figure 1. Error-Amplifier Configuration
IS
(see Note A)
Error
Amplifier
+
â
Rf
RS
COMP
ISENSE
Cf
GND
2R
R
1V
Current-Sense
Comparator
NOTE A: Peak current (IS) is determined by the formula:
IS(max)
+
1V
RS
A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients.
Figure 2. Current-Sense Circuit
NOTE A:
For RT > 5 kâ¦:
f
[
1.72
RTCT
REF
RT/CT
GND
RT
(see Note A)
CT
Figure 3. Oscillator Section
8
⢠POST OFFICE BOX 655303 DALLAS, TEXAS 75265
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