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參數(shù)資料
| 型號(hào)： | PM6675STR |
| 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)： | 39/53頁 |
| 文件大?。?/td> | 2632K |
| 代理商： | PM6675STR |
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Application information
PM6675S
44/53
where RDS(on) is the drain-source on-resistance of the control MOSFET.
Switching losses are approximately given by:
Equation 42
where tON and tOFF are the turn-on and turn-off times of the MOSFET and depend on the
gate-driver current capability and the gate charge Qgate. A greater efficiency is achieved with
low RDSon. Unfortunately low RDSon MOSFETs have a great gate charge.
As general rule, the RDS(on) x Qgate product should be minimized to find the suitable
MOSFET.
Logic-level MOSFETs are recommended, as long as low-side and high-side gate drivers are
powered by VVCC = +5 V. The breakdown voltage of the MOSFETs (VBRDSS) must be
greater than the maximum input voltage VINmax.
Below some tested high-side MOSFETs are listed.
In buck converters the power dissipation of the synchronous MOSFET is mainly due to
conduction losses:
Equation 43
Maximum conduction losses occur at the maximum input voltage:
Equation 44
The synchronous rectifier should have the lowest RDS(on) as possible. When the high-side
MOSFET turns on, high dV/dt of the phase node can bring up even the low-side gate
through its gate-drain capacitance CRRS, causing a cross-conduction problem. Once again,
the choice of the low-side MOSFET is a trade-off between on resistance and gate charge; a
good selection should minimizes the ratio CRSS / CGS where
Equation 45
Below some tested low-side MOSFETs are listed.
Table 14.
Evaluated high-side MOSFETs
Manufacturer
Type
RDS(on)
(m
)
Gate charge
(nC)
Rated reverse
voltage (V)
ST
STS12NH3LL
10.5
12
30
IR
IRF7811
9
18
30
2
f
t
)
2
I
(max)
I
(
V
2
f
t
)
2
I
(max)
I
(
V
P
sw
off
L
LOAD
IN
sw
on
L
LOAD
IN
switching
+
+
=
conduction
DLowSide
P
2
MAX
,
LOAD
MAX
,
IN
OUT
DSon
conduction
I
V
1
R
P
=
RSS
ISS
GS
C
=
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| 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 |
| PM6680 | 功能描述:DC/DC 開關(guān)控制器 No Rsense dual StepDwn Controller 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 |
| PM6680_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:No Rsense dual step-down controller with adjustable voltages for notebook system power |
| PM6680A | 功能描述:DC/DC 開關(guān)控制器 Dual sync controller 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 |
| PM6680ATR | 功能描述:DC/DC 開關(guān)控制器 Dual sync controller 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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