參數(shù)資料
型號(hào): FAN6520A
廠商: Fairchild Semiconductor Corporation
英文描述: Single Synchronous Buck PWM Controller
中文描述: 單同步降壓PWM控制器
文件頁數(shù): 12/15頁
文件大?。?/td> 580K
代理商: FAN6520A
12
REV. 1.0.2 8/26/04
FAN6520A
PRODUCT SPECIFICATION
Low-Side Losses
Q2, however, switches on or off with its parallel shottky
diode conducting, therefore V
DS
0.5V. Since P
SW
is
proportional to V
DS
, Q2’s switching losses are negligible and
we can select Q2 based on R
DS(ON)
only.
Conduction losses for Q2 are given by:
P
COND
= (1-D)
×
I
OUT2
×
R
DS(ON)
(18)
where R
DS(ON)
is the R
DS(ON)
of the MOSFET at the
highest operating junction temperature and
is the minimum duty cycle for the converter.
Since D
MIN
< 20% for portable computers, (1-D)
1
produces a conservative result, further simplifying the
calculation.
The maximum power dissipation (P
D(MAX
) ) is a function of
the maximum allowable die temperature of the low-side
MOSFET, the
θ
J-A
, and the maximum allowable ambient
temperature rise:
θ
J-A
, depends primarily on the amount of PCB area that can
be devoted to heat sinking (see Fairchild app note AN-1029
for SO-8 MOSFET thermal information).
D
V
IN
---V
=
P
D MAX
)
T
------------------------------------------------
T
)
J
A
=
(19)
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參數(shù)描述
FAN6520A WAF 制造商:Fairchild Semiconductor Corporation 功能描述:
FAN6520A_06 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:Single Synchronous Buck PWM Controller
FAN6520AIM 功能描述:電壓模式 PWM 控制器 ANG FG SynchBuck Regulator- 8ld RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
FAN6520AIMX 功能描述:電壓模式 PWM 控制器 ANG FG SynchBuck Regulator- 8ld RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
FAN6520AM 功能描述:電壓模式 PWM 控制器 Single Synchronous Buck PWM Controller RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel