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TL3842BD Datasheet(PDF) 13 Page - Texas Instruments

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Part No. TL3842BD
Description  HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
Logo TI1 - Texas Instruments

TL3842BD Datasheet(HTML) 13 Page - Texas Instruments

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Shutdown Technique
330
1 k
500
To Current-Sense
Resistor
Shutdown
Shutdown
COMP
VREF
ISENSE
RT
0.1
µF
CT
R1
R2
ISENSE
RSENSE
C
VREF
RT/CT
ISENSE
TL284xB, TL384xB
HIGH-PERFORMANCE CURRENT-MODE PWM CONTROLLERS
SLVS610B – AUGUST 2006 – REVISED JULY 2007
APPLICATION INFORMATION (continued)
The PWM controller (see Figure 5) can be shut down by two methods: either raise the voltage at ISENSE above
1 V or pull the COMP terminal below a voltage two diode drops above ground. Either method causes the output
of the PWM comparator to be high (refer to block diagram). The PWM latch is reset dominant so that the output
remains low until the next clock cycle after the shutdown condition at the COMP or ISENSE terminal is removed.
In one example, an externally latched shutdown can be accomplished by adding an SCR that resets by cycling
VCC below the lower UVLO threshold. At this point, the reference turns off, allowing the SCR to reset.
Figure 5. Shutdown Techniques
A fraction of the oscillator ramp can be summed resistively with the current-sense signal to provide slope
compensation for converters requiring duty cycles over 50% (see Figure 6). Note that capacitor C forms a filter
with R2 to suppress the leading-edge switch spikes.
Figure 6. Slope Compensation
13
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