參數(shù)資料
型號： PM6670AS
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 3 A SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁數(shù)： 25/53頁
文件大小： 745K
代理商： PM6670AS
PM6670AS
Device description
Doc ID 14436 Rev 2
31/53
Figure 34.
Current sensing scheme
An internal 120
μA current source is connected to C
SNS pin that is also the non-inverting
input of the positive current limit comparator. When the voltage drop developed across the
sensing parameter equals the voltage drop across the programming resistor RILIM, the
controller skips subsequent cycles until the overcurrent condition is detected or the output
UV protection latches off the device (see Section 7.1.11: Over voltage and under voltage
).
Referring to Figure 34, 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 PM6670AS 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
120 mV fixed threshold.
7.1.6
POR, UVLO and soft-start
The PM6670AS 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 (4.2 V typ.), keeping active the
internal discharge MOSFETs (only if AVCC > 1 V).
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
HGATE
PHASE
CSNS
LGATE
PGND
PM6670
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
PM6670AS
DSon
ILIM
CL
R
A
120
I
μ
=
相關(guān)PDF資料
PDF描述
PM6670A 1.4 A SWITCHING CONTROLLER, QCC24
PM6670STR 3 A SWITCHING CONTROLLER, QCC24
PM6670S 3 A SWITCHING CONTROLLER, QCC24
PM6670TR 1.4 A SWITCHING CONTROLLER, QCC24
PM6670ATR 1.4 A SWITCHING CONTROLLER, QCC24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6670ASTR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670ATR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6670S 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
PM6670STR 功能描述:DC/DC 開關(guān)控制器 Complete DDR2/3 Mem Pwr supply controllr 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
PM6670TR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Complete DDR2/3 Mem Pwr supply controllr RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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