參數(shù)資料
型號(hào)： PM6675AS
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(yè)數(shù)： 19/48頁(yè)
文件大?。?/td> 2481K
代理商： PM6675AS
Device description
PM6675AS
26/48
7.1.4
Mode-of-operation selection
Figure 29.
VSEL and NOSKIP multifunction pin configurations
The PM6675AS has been designed to satisfy the widest range of applications. The device is
provided of some multilevel pins which allow the user to choose the appropriate
configuration. The VSEL pin is used to firstly decide between fixed preset or adjustable
(user defined) output voltages.
When the VSEL pin is connected to +5 V, the PM6675AS set the switching section output
voltage to 1.5 V without the need of an external divider.
Applications requiring different output voltages can be managed by PM6675AS simply
setting the adjustable mode. If the VSEL pin voltage is higher than 4 V, the fixed output
mode is selected. Connecting an external divider to the VSEL pin, it is used as negative
input of the error amplifier and the output voltage is given by expression (20).
Equation 20
The output voltage can be set in the range from 0.6 V to 3.3 V.
The NOSKIP is 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.
Table 8.
Mode-of-operation settings summary
VSEL
NOSKIP
VOUT
Operating mode
VVSEL > 4.3V
VNOSKI P > 4.2 V
1.5 V
Forced-PWM
1V < VNOSKIP < 3.5 V
Non-Audible Pulse-skip
< 0.5 V
Pulse-Skip
VVSEL < 3.7V
VNOSKIP > 4.2 V
ADJ
Forced-PWM
1 V < VNOSKIP < 3.5 V
Non-Audible Pulse-skip
VNOSKIP < 0.5 V
Pulse-Skip
PM6675AS
NOSKIP
VSEL
R9
R8
VOUT
+5V
VREF
8
R
9
R
8
R
6
.
0
VOUTADJ
+
=
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參數(shù)描述
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
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
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