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TL3843B Datenblatt(PDF) 11 Page - Texas Instruments

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Teilenummer TL3843B
Bauteilbeschribung  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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Hersteller  TI [Texas Instruments]
Direct Link  http://www.ti.com
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APPLICATION INFORMATION
Zi
Zf
VFB
COMP
2.5 V
0.5 mA
Error
Amplifier
+
RS
Cf
Rf
Error
Amplifier
2R
R
1 V
Current-Sense
Comparator
IS
(see Note A)
+
ISENSE
COMP
GND
CT
RT
VREF
RT/CT
GND
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610A – AUGUST 2006 – REVISED SEPTEMBER 2006
The error-amplifier configuation circuit is shown in Figure 1.
A.
Error amplifier can source or sink up to 0.5 mA.
Figure 1. Error-Amplifier Configuration
The current-sense circuit is shown in Figure 2.
A.
Peak current (IS) is determined by the formula: IS(max) = 1 V/RS
B.
A small RC filter formed by resistor Rf and capacitor Cf may be required to suppress switch transients.
Figure 2. Current-Sense Circuit
The oscillator frequency is set using the circuit shown in Figure 3. The frequency is calculated as:
f = 1 / RTCT
For RT > 5 kΩ:
f
≈ 1.72 / R
TCT
Figure 3. Oscillator Section
11
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