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参数资料
| 型号： | PM6670STR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A SWITCHING CONTROLLER, QCC24 |
| 封装： | 4 X 4 MM, LEAD FREE, VFQFPN-24 |
| 文件页数： | 39/54页 |
| 文件大小： | 742K |
| 代理商： | PM6670STR |
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Application information
PM6670S
44/54
Doc ID 14432 Rev 4
If ceramic capacitors are used, the output voltage ripple due to inductor current ripple is
negligible. Then the inductance could be smaller, reducing the size of the choke. In this case
it is important that output capacitor can adsorb the inductor energy without generating an
over-voltage condition when the system changes from a full load to a no load condition.
The minimum output capacitance can be chosen by the following equation:
Equation 38
where Vf is the output capacitor voltage after the load transient, while VI is the output
capacitor voltage before the load transient.
In Table 15 are listed some tested polymer capacitors are listed.
8.1.4
MOSFETs selection
In a notebook application, power management efficiency is a high level requirement. Power
dissipation on the power switches becomes an important factor in the selection of switches.
Losses of high-side and low-side MOSFETs depend on their working condition.
Considering the high-side MOSFET, the power dissipation is calculated as:
Equation 39
Maximum conduction losses are approximately given by:
Equation 40
Table 15.
Evaluated output capacitors
Manufacturer
Series
Capacitance
(μF)
Rated voltage
(V)
ESR max @100 kHz
(m
Ω)
SANYO
4TPE220MF
220
4V
15 to 25
4TPE150MI
220
4V
18
4TPC220M
220
4V
40
HITACHI
TNCB OE227MTRYF
220
2.5V
25
2
MAX
,
LOAD
min
,
OUT
Vi
Vf
I
L
C
=
2
switching
conduction
DHighSide
P
+
=
2
MAX
,
LOAD
min
.
IN
OUT
DSon
conduction
I
V
R
P
=
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| PM6675ATR | 功能描述:低压差控制器 - LDO High eff SD CNRL RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
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