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參數(shù)資料
| 型號： | PM6670STR |
| 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)： | 25/54頁 |
| 文件大?。?/td> | 742K |
| 代理商： | PM6670STR |
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PM6670S
Device description
Doc ID 14432 Rev 4
31/54
VDDQ output voltage can be set in the range of 0.9 V to 2.6 V. Adjustable mode
automatically switches DDRSEL pin to become the power saving algorithm selector: if tied
to +5 V, the forced-PWM (fixed frequency) control is performed. If grounded or connected to
VREF pin (1.237 V reference voltage), the pulse-skip or non-audible pulse-skip modes are
respectively selected.
7.1.5
Current sensing and current limit
The PM6670S 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 sensed 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 36.
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
).
Table 8.
Mode-of-operation settings summary
Mode
DDRSEL
VDDQ
Operating mode
VMODE > 4.3 V
VDDRSEL > 4.2 V
1.8 V
Pulse-skip
1V < VDDRSEL < 3.5 V
1.5 V
<0.5 V
VMODE < 3.7 V
VDDRSEL > 4.2 V
ADJ
Forced-PWM
1V < VDDRSEL < 3.5 V
Non-audible pulse-skip
VDDRSEL < 0.5 V
Pulse-skip
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
PM6670S
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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 安裝風格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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