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參數(shù)資料
| 型號(hào)： | PM6670TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.4 A SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, LEAD FREE, VFQFN-24 |
| 文件頁數(shù)： | 25/55頁 |
| 文件大小： | 849K |
| 代理商： | PM6670TR |
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PM6670
Device description
31/53
Referring to Figure 36, the RDSon sensing technique allows high efficiency performance
without the need for an external sensing resistor. The on-resistance of the MOSFET is
affected by temperature drift and nominal value spread of the parameter itself; this must be
considered during the RILIM setting resistor design.
It must be taken into account that the current limit circuit actually regulates the inductor
valley current. This means that RILIM must be calculated to set a limit threshold given by the
maximum DC output current plus half of the inductor ripple current:
Equation 22
The PM6670 provides also a fixed negative current limit to prevent excessive reverse
inductor current when the switching section sinks current from the load in forced-PWM (3rd
quadrant working conditions). This negative current limit threshold is measured between
PHASE and PGND pins, comparing the drop magnitude on PHASE pin with an internal
120mV fixed threshold.
7.1.6
POR, UVLO and Soft Start
The PM6670 automatically performs an internal startup sequence during the rising phase of
the analog supply of the device (AVCC). The switching controller remains in a stand-by
state until AVCC crosses the upper UVLO threshold (4.2V typ.), keeping active the internal
discharge MOSFETs (only if AVCC > 1V).
The soft-start allows a gradual increase of the internal current limit threshold during start-up
reducing the input/output surge currents. At the beginning of start-up, the PM6670 current
limit is set to 25% of nominal value and the Under Voltage Protection is disabled. Then, the
current limit threshold is sequentially brought to 100% in four steps of approximately 750
s
(Figure 37).
Figure 37. Soft-start waveforms
DSon
ILIM
CL
R
A
100
I
=
S5
Current limit threshold
Switching output
Time
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| PM6675 | 制造商:STMicroelectronics 功能描述: 制造商:STMicroelectronics 功能描述:LDO CNTRLR STDN 0.6V TO 3.3V/1.5V 24PIN VFQFPN - Rail/Tube |
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| PM6675ASTR | 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 |
| PM6675ATR | 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 |
| PM6675S | 功能描述:DC/DC 開關(guān)控制器 DDR 2/3 Memory Pwr Cntrl RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(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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