參數(shù)資料
型號(hào)： PM6675ATR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, VFQFPN-24
文件頁(yè)數(shù)： 7/50頁(yè)
文件大?。?/td> 782K
代理商： PM6675ATR
PM6675
Device description
15/47
6.1
Switching section - constant on-time PWM controller
The PM6675 employees a pseudo-fixed frequency, Constant On-Time (COT) controller as
the core of the switching section. It is well known that the COT controller uses a relatively
simple algorithm and uses the ripple voltage derived across the output capacitor's ESR to
trigger the On-Time one-shot generator. In this way, the output capacitor's ESR acts as a
current sense resistor providing the appropriate ramp signal to the PWM comparator.
Nearly constant switching frequency is achieved by the system's loop in steady-state
operating conditions by varying the On-Time duration, avoiding thus the need for a clock
generator. The On-Time one shot duration is directly proportional to the output voltage,
detected by theVSNS pin, and inversely proportional to the input voltage, detected by the
the VOSC pin, as follows:
Equation 1
where KOSC is a constant value (130ns typ.) and τ is the internal propagation delay
(40ns typ.). The one-shot generator directly drives the high-side MOSFET at the beginning
of each switching cycle allowing the inductor current to increase; after the On-Time has
expired, an Off-Time phase, in which the low-side MOSFET is turned on, follows. The Off-
Time duration is solely determined by the output voltage: when lower than the set value (i.e.
the voltage at VSNS pin is lower than the internal reference VR = 0.6V), the synchronous
rectifier is turned off and a new cycle begins (Figure 4).
Figure 4.
Inductor current and output voltage in steady state conditions
τ
+
=
OSC
SNS
OSC
ON
V
K
T
Ton
Toff
Inductor
current
t
Output
voltage
Vreg
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PM6675STR 功能描述:低壓差控制器 - LDO Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6675TR 功能描述:低壓差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6
PM6680 功能描述:DC/DC 開(kāi)關(guān)控制器 No Rsense dual StepDwn Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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