參數(shù)資料
型號(hào): TL2842BQDRQ1
廠商: TEXAS INSTRUMENTS INC
元件分類: 穩(wěn)壓器
英文描述: 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
封裝: PLASTIC, MS-012AB, SOIC-14
文件頁(yè)數(shù): 4/16頁(yè)
文件大?。?/td> 300K
代理商: TL2842BQDRQ1
330
1 k
500
To Current-Sense
Resistor
Shutdown
COMP
VREF
ISENSE
RT
0.1
F
CT
R1
R2
ISENSE
RSENSE
C
VREF
RT/CT
ISENSE
SLVSAE2 – JULY 2010
www.ti.com
Shutdown Technique
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 (see the Functional 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
12
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TL2843B-Q1
相關(guān)PDF資料
PDF描述
TL2845BQDRQ1 1 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO14
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