參數(shù)資料
型號(hào)： PM6675
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
文件頁數(shù)： 18/47頁
文件大小： 650K
代理商： PM6675
Product(s)
- Obsolete
Product(s)
Product(s)
- Obsolete
Product(s)
PM6675
Device description
25/47
6.1.5
Current sensing and current limit
The PM6675 switching controller uses a valley current sensing algorithm to properly handle
the current limit protection and the inductor current zero-crossing information. The current is
detected during the conduction time of the low-side MOSFET. The current sensing element
is the on-resistance of the low-side switch. The sensing scheme is visible in Figure 12.
Figure 12. Current sensing scheme
An internal 100
A 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 6.1.11: Switching section OV and UV
).
Referring to Figure 12, the RDS(on) 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.
Table 6. Mode-of-operation settings summary
VSEL
NOSKIP
VOUT
Operating mode
VVSEL > 4.3V
VNOSKIP > 4.2V
1.5V
Forced-PWM
1V <VNOSKIP < 3.5V
Non-audible pulse-skip
< 0.5V
Pulse-skip
VVSEL < 3.7V
VNOSKIP > 4.2V
ADJ
Forced-PWM
1V <VNOSKIP < 3.5V
Non-audible pulse-skip
VNOSKIP < 0.5V
Pulse-skip
HGATE
PHASE
CSNS
LGATE
PGND
PM6675
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
HGATE
PHASE
CSNS
LGATE
PGND
PM6675
100A
R
ILIM
V
IN
V
OUT
I
VALLEYRDSon
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6675AS 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
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
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
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