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| TL2843B-Q1 Datasheet, PDF (10/16 Pages) Texas Instruments – HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER | |||
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TL2843B-Q1
SLVSAE2A â JULY 2010 â REVISED FEBRUARY 2012
APPLICATION INFORMATION
The error-amplifier configuation circuit is shown in Figure 1.
2.5 V
Error
Amplifier
Zi
VFB
+
â
Zf
COMP
0.5 mA
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.
IS
(see Note A)
Error
Amplifier
+
â
COMP
Rf
ISENSE
2R
R
1V
Current-Sense
Comparator
RS
Cf
GND
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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 kâ¦:
f â 1.72 / RTCT
VREF
RT
RT/CT
CT
GND
Figure 3. Oscillator Section
10
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Product Folder Link(s): TL2843B-Q1
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