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參數(shù)資料
| 型號(hào)： | RT8004QS |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | 3A, 4MHz, Synchronous Step-Down Regulator |
| 中文描述： | 第3A，4MHz，同步降壓型穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 5/16頁(yè) |
| 文件大?。?/td> | 257K |
| 代理商： | RT8004QS |
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RT8004
5
DS8004-03 September 2007
www.richtek.com
Dropout Operation
When the input supply voltage decreases toward the output voltage, the duty cycle increases toward the maximum on-
time. Further reduction of the supply voltage forces the main switch to remain on for more than one cycle eventually
reaching 100% duty cycle. The output voltage will then be determined by the input voltage minus the voltage drop across
the internal P-Channel MOSFET and the inductor.
Low Supply Operation
The RT8004 is designed to operate down to an input supply voltage of 2.65V. One important c
onsideration at low input
supply voltages is that the R
DS(ON)
of the P-Channel and N-Channel power switches increases. The user should calculate
the power dissipation when the RT8004 is used at 100% duty cycle with low input voltages to ensure that thermal limits
are not exceeded.
Slope Compensation and Inductor Peak Current
Slope compensation provides stability in constant frequency architectures by preventing subharmonic oscillations at
duty cycles greater than 50%. It is accomplished internally by adding a compensating ramp to the inductor current
signal. Normally, the maximum inductor peak current is reduced when slope compensation is added. In the RT8004,
however, separated inductor current signals are used to monitor over current condition
and minimum peak curr
ent. This
keeps the maximum output current and minimum peak current relatively constant regardless of duty cycle.
Short-Circuit Protection
When the output is shorted to ground, the inductor current decays very slowly during a single switching cycle. A current
runaway detector is used to monitor inductor current. As current increasing beyond the control of current loop, switching
cycles will be skipped to prevent current runaway from occurring.
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| RT8005 | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| RT8005GQV | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1A, 2MHz, High-Efficiency Synchronous Buck PWM Converter |
| RT8005PQV | 制造商:RICHTEK 功能描述:DC/DC (IC) |
| RT8008 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:1.5MHz,600mA,High Efficiency PWM Step-Down DC/DC Converter |
| RT8008-10PB | 制造商:RICHTEK 制造商全稱:Richtek Technology Corporation 功能描述:1.5MHz, 600mA, High Efficiency PWM Step-Down DC/DC Converter |
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