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TL2845BQDRQ1 Datasheet(PDF) 10 Page - Texas Instruments

Part # TL2845BQDRQ1
Description  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLER
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TL2845BQDRQ1 Datasheet(HTML) 10 Page - Texas Instruments

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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
TL2843B-Q1
SLVSAE2A
– JULY 2010 – REVISED FEBRUARY 2012
www.ti.com
APPLICATION INFORMATION
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 / RTCT
Figure 3. Oscillator Section
10
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© 2010–2012, Texas Instruments Incorporated
Product Folder Link(s): TL2843B-Q1


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